change option presets to be multi-select

Agent-Logs-Url: https://github.com/alexta69/metube/sessions/aef158da-f919-4a3d-a5ee-b71df51c124d

Co-authored-by: alexta69 <7450369+alexta69@users.noreply.github.com>

.vscode/launch.json

@@ -13,12 +13,16 @@
                 "env": {
                     "DOWNLOAD_DIR": "${env:USERPROFILE}/Downloads",
                     "STATE_DIR": "${env:TEMP}",
+                    "ALLOW_YTDL_OPTIONS_OVERRIDES": "true",
+                    "YTDL_OPTIONS_PRESETS": "{\"sponsorblock\": {\"postprocessors\": [{\"key\": \"SponsorBlock\", \"categories\": [\"sponsor\", \"selfpromo\", \"interaction\"]}, {\"key\": \"ModifyChapters\", \"remove_sponsor_segments\": [\"sponsor\", \"selfpromo\", \"interaction\"]}]}, \"embed-subs\": {\"writesubtitles\": true, \"writeautomaticsub\": true, \"subtitleslangs\": [\"en\", \"de\"], \"postprocessors\": [{\"key\": \"FFmpegEmbedSubtitle\"}]}, \"limit-rate\": {\"ratelimit\": 5000000}}",
                 }
             },
             "osx": {
                 "env": {
                     "DOWNLOAD_DIR": "${env:HOME}/Downloads",
                     "STATE_DIR": "${env:TMPDIR}",
+                    "ALLOW_YTDL_OPTIONS_OVERRIDES": "true",
+                    "YTDL_OPTIONS_PRESETS": "{\"sponsorblock\": {\"postprocessors\": [{\"key\": \"SponsorBlock\", \"categories\": [\"sponsor\", \"selfpromo\", \"interaction\"]}, {\"key\": \"ModifyChapters\", \"remove_sponsor_segments\": [\"sponsor\", \"selfpromo\", \"interaction\"]}]}, \"embed-subs\": {\"writesubtitles\": true, \"writeautomaticsub\": true, \"subtitleslangs\": [\"en\", \"de\"], \"postprocessors\": [{\"key\": \"FFmpegEmbedSubtitle\"}]}, \"limit-rate\": {\"ratelimit\": 5000000}}",
                 }
             },
             "console": "integratedTerminal"

Dockerfile

@@ -63,9 +63,10 @@ ENV UMASK=022
 ENV DOWNLOAD_DIR=/downloads
 ENV STATE_DIR=/downloads/.metube
 ENV TEMP_DIR=/downloads
+ENV PORT=8081
 VOLUME /downloads
 EXPOSE 8081
-HEALTHCHECK --interval=30s --timeout=5s --start-period=20s --retries=3 CMD curl -fsS "http://localhost:8081/" || exit 1
+HEALTHCHECK --interval=30s --timeout=5s --start-period=20s --retries=3 CMD curl -fsS "http://localhost:${PORT}/" || exit 1
 
 # Add build-time argument for version
 ARG VERSION=dev

README.md

@@ -3,7 +3,12 @@
 ![Build Status](https://github.com/alexta69/metube/actions/workflows/main.yml/badge.svg)
 ![Docker Pulls](https://img.shields.io/docker/pulls/alexta69/metube.svg)
 
-Web GUI for youtube-dl (using the [yt-dlp](https://github.com/yt-dlp/yt-dlp) fork) with playlist support. Allows you to download videos from YouTube and [dozens of other sites](https://github.com/yt-dlp/yt-dlp/blob/master/supportedsites.md).
+MeTube is a self-hosted web UI for `yt-dlp`, for downloading media from YouTube and [dozens of other sites](https://github.com/yt-dlp/yt-dlp/blob/master/supportedsites.md).
+
+Key capabilities:
+* Download videos, audio, captions, and thumbnails from a browser UI.
+* Download playlists and channels, with configurable output and download options.
+* Subscribe to channels and playlists, periodically check for new items, and queue new uploads automatically.
 
 ![screenshot1](https://github.com/alexta69/metube/raw/master/screenshot.gif)
 
@@ -63,6 +68,29 @@ Certain values can be set via environment variables, using the `-e` parameter on
 * __OUTPUT_TEMPLATE_CHANNEL__: The template for the filenames of the downloaded videos when downloaded as a channel. Defaults to `%(channel)s/%(title)s.%(ext)s`. Set to empty to use `OUTPUT_TEMPLATE` instead.
 * __YTDL_OPTIONS__: Additional options to pass to yt-dlp in JSON format. [See available options here](https://github.com/yt-dlp/yt-dlp/blob/master/yt_dlp/YoutubeDL.py#L222). They roughly correspond to command-line options, though some do not have exact equivalents here. For example, `--recode-video` has to be specified via `postprocessors`. Also note that dashes are replaced with underscores. You may find [this script](https://github.com/yt-dlp/yt-dlp/blob/master/devscripts/cli_to_api.py) helpful for converting from command-line options to `YTDL_OPTIONS`.
 * __YTDL_OPTIONS_FILE__: A path to a JSON file that will be loaded and used for populating `YTDL_OPTIONS` above. Please note that if both `YTDL_OPTIONS_FILE` and `YTDL_OPTIONS` are specified, the options in `YTDL_OPTIONS` take precedence. The file will be monitored for changes and reloaded automatically when changes are detected.
+* __YTDL_OPTIONS_PRESETS__: Lets you define **named presets**—each preset is a bundle of extra download settings. In the web UI (Advanced Options), you can pick **one or more** presets for a download instead of changing the server-wide defaults. If several presets are selected, they are applied **in order**; if two presets touch the same setting, the **later** one wins. If you turn on the optional “custom yt-dlp options” field, those choices override presets. Define each preset the same way as global `YTDL_OPTIONS` (see above). Example:
+  ```json
+  {
+    "sponsorblock": {
+      "postprocessors": [
+        { "key": "SponsorBlock", "categories": ["sponsor", "selfpromo", "interaction"] },
+        { "key": "ModifyChapters", "remove_sponsor_segments": ["sponsor", "selfpromo", "interaction"] }
+      ]
+    },
+    "embed-subs": {
+      "writesubtitles": true,
+      "writeautomaticsub": true,
+      "subtitleslangs": ["en", "de"],
+      "postprocessors": [{ "key": "FFmpegEmbedSubtitle" }]
+    },
+    "limit-rate": {
+      "ratelimit": 5000000
+    }
+  }
+  ```
+  With this file, the UI would offer **sponsorblock** (remove sponsor/self-promo/interaction segments), **embed-subs** (add English and German subtitles into the video file), and **limit-rate** (slow downloads to about 5 MB/s)—things the normal quality/format controls do not cover.
+* __YTDL_OPTIONS_PRESETS_FILE__: A path to a JSON file containing `YTDL_OPTIONS_PRESETS`. If both are specified, values from `YTDL_OPTIONS_PRESETS_FILE` are merged into `YTDL_OPTIONS_PRESETS`.
+* __ALLOW_YTDL_OPTIONS_OVERRIDES__: Whether to show the web UI field for manual per-download `ytdl_options_overrides`. Defaults to `false`. Enabling this allows arbitrary yt-dlp API options to be supplied by UI users, which may enable arbitrary command execution inside the container depending on the options used. Enable only if you understand and accept that risk.
 
 ### 🌐 Web Server & URLs
 

app/main.py

@@ -57,6 +57,9 @@ class Config:
         'CLEAR_COMPLETED_AFTER': '0',
         'YTDL_OPTIONS': '{}',
         'YTDL_OPTIONS_FILE': '',
+        'YTDL_OPTIONS_PRESETS': '{}',
+        'YTDL_OPTIONS_PRESETS_FILE': '',
+        'ALLOW_YTDL_OPTIONS_OVERRIDES': 'false',
         'ROBOTS_TXT': '',
         'HOST': '0.0.0.0',
         'PORT': '8081',
@@ -70,7 +73,7 @@ class Config:
         'ENABLE_ACCESSLOG': 'false',
     }
 
-    _BOOLEAN = ('DOWNLOAD_DIRS_INDEXABLE', 'CUSTOM_DIRS', 'CREATE_CUSTOM_DIRS', 'DELETE_FILE_ON_TRASHCAN', 'HTTPS', 'ENABLE_ACCESSLOG')
+    _BOOLEAN = ('DOWNLOAD_DIRS_INDEXABLE', 'CUSTOM_DIRS', 'CREATE_CUSTOM_DIRS', 'DELETE_FILE_ON_TRASHCAN', 'HTTPS', 'ENABLE_ACCESSLOG', 'ALLOW_YTDL_OPTIONS_OVERRIDES')
 
     def __init__(self):
         for k, v in self._DEFAULTS.items():
@@ -91,12 +94,17 @@ class Config:
         # Convert relative addresses to absolute addresses to prevent the failure of file address comparison
         if self.YTDL_OPTIONS_FILE and self.YTDL_OPTIONS_FILE.startswith('.'):
             self.YTDL_OPTIONS_FILE = str(Path(self.YTDL_OPTIONS_FILE).resolve())
+        if self.YTDL_OPTIONS_PRESETS_FILE and self.YTDL_OPTIONS_PRESETS_FILE.startswith('.'):
+            self.YTDL_OPTIONS_PRESETS_FILE = str(Path(self.YTDL_OPTIONS_PRESETS_FILE).resolve())
 
         self._runtime_overrides = {}
 
         success,_ = self.load_ytdl_options()
         if not success:
             sys.exit(1)
+        success,_ = self.load_ytdl_option_presets()
+        if not success:
+            sys.exit(1)
 
     def set_runtime_override(self, key, value):
         self._runtime_overrides[key] = value
@@ -119,6 +127,7 @@ class Config:
         'PUBLIC_HOST_AUDIO_URL',
         'DEFAULT_OPTION_PLAYLIST_ITEM_LIMIT',
         'SUBSCRIPTION_DEFAULT_CHECK_INTERVAL',
+        'ALLOW_YTDL_OPTIONS_OVERRIDES',
     )
 
     def frontend_safe(self) -> dict:
@@ -160,6 +169,37 @@ class Config:
         self._apply_runtime_overrides()
         return (True, '')
 
+    def load_ytdl_option_presets(self) -> tuple[bool, str]:
+        try:
+            self.YTDL_OPTIONS_PRESETS = json.loads(os.environ.get('YTDL_OPTIONS_PRESETS', '{}'))
+            assert isinstance(self.YTDL_OPTIONS_PRESETS, dict)
+            assert all(isinstance(name, str) and isinstance(options, dict) for name, options in self.YTDL_OPTIONS_PRESETS.items())
+        except (json.decoder.JSONDecodeError, AssertionError):
+            msg = 'Environment variable YTDL_OPTIONS_PRESETS is invalid'
+            log.error(msg)
+            return (False, msg)
+
+        if not self.YTDL_OPTIONS_PRESETS_FILE:
+            return (True, '')
+
+        log.info(f'Loading yt-dlp option presets from "{self.YTDL_OPTIONS_PRESETS_FILE}"')
+        if not os.path.exists(self.YTDL_OPTIONS_PRESETS_FILE):
+            msg = f'File "{self.YTDL_OPTIONS_PRESETS_FILE}" not found'
+            log.error(msg)
+            return (False, msg)
+        try:
+            with open(self.YTDL_OPTIONS_PRESETS_FILE) as json_data:
+                opts = json.load(json_data)
+            assert isinstance(opts, dict)
+            assert all(isinstance(name, str) and isinstance(options, dict) for name, options in opts.items())
+        except (json.decoder.JSONDecodeError, AssertionError):
+            msg = 'YTDL_OPTIONS_PRESETS_FILE contents is invalid'
+            log.error(msg)
+            return (False, msg)
+
+        self.YTDL_OPTIONS_PRESETS.update(opts)
+        return (True, '')
+
 config = Config()
 # Align root logger level with Config (keeps a single source of truth).
 # This re-applies the log level after Config loads, in case LOGLEVEL was
@@ -194,6 +234,40 @@ VALID_VIDEO_CODECS = {'auto', 'h264', 'h265', 'av1', 'vp9'}
 VALID_VIDEO_FORMATS = {'any', 'mp4', 'ios'}
 VALID_AUDIO_FORMATS = {'m4a', 'mp3', 'opus', 'wav', 'flac'}
 VALID_THUMBNAIL_FORMATS = {'jpg'}
+def _parse_ytdl_options_overrides(value, *, enabled: bool) -> dict:
+    if value is None or value == '':
+        return {}
+
+    if isinstance(value, str):
+        try:
+            value = json.loads(value)
+        except json.JSONDecodeError as exc:
+            raise web.HTTPBadRequest(reason='ytdl_options_overrides must be valid JSON') from exc
+
+    if not isinstance(value, dict):
+        raise web.HTTPBadRequest(reason='ytdl_options_overrides must be a JSON object')
+
+    if value and not enabled:
+        raise web.HTTPBadRequest(reason='ytdl_options_overrides are disabled')
+
+    return value
+
+
+def _parse_ytdl_options_presets(post: dict) -> list[str]:
+    """Normalize preset names from add/subscribe body; supports list or legacy singular string."""
+    raw = post.get('ytdl_options_presets')
+    if raw is None:
+        raw = post.get('ytdl_options_preset')
+    if raw is None:
+        return []
+    if isinstance(raw, list):
+        return [str(x).strip() for x in raw if str(x).strip()]
+    if isinstance(raw, str):
+        s = raw.strip()
+        return [s] if s else []
+    raise web.HTTPBadRequest(
+        reason='ytdl_options_presets must be a JSON array of strings (or legacy ytdl_options_preset string)',
+    )
 
 
 def _migrate_legacy_request(post: dict) -> dict:
@@ -384,6 +458,7 @@ def parse_download_options(post: dict) -> dict:
     chapter_template = post.get('chapter_template')
     subtitle_language = post.get('subtitle_language')
     subtitle_mode = post.get('subtitle_mode')
+    ytdl_options_overrides = post.get('ytdl_options_overrides')
 
     if custom_name_prefix is None:
         custom_name_prefix = ''
@@ -407,6 +482,11 @@ def parse_download_options(post: dict) -> dict:
     quality = str(quality).strip().lower()
     subtitle_language = str(subtitle_language).strip()
     subtitle_mode = str(subtitle_mode).strip()
+    ytdl_options_presets = _parse_ytdl_options_presets(post)
+    ytdl_options_overrides = _parse_ytdl_options_overrides(
+        ytdl_options_overrides,
+        enabled=config.ALLOW_YTDL_OPTIONS_OVERRIDES,
+    )
 
     if chapter_template and ('..' in chapter_template or chapter_template.startswith('/') or chapter_template.startswith('\\')):
         raise web.HTTPBadRequest(reason='chapter_template must not contain ".." or start with a path separator')
@@ -414,6 +494,9 @@ def parse_download_options(post: dict) -> dict:
         raise web.HTTPBadRequest(reason='subtitle_language must match pattern [A-Za-z0-9-] and be at most 35 characters')
     if subtitle_mode not in VALID_SUBTITLE_MODES:
         raise web.HTTPBadRequest(reason=f'subtitle_mode must be one of {sorted(VALID_SUBTITLE_MODES)}')
+    for preset_name in ytdl_options_presets:
+        if preset_name not in config.YTDL_OPTIONS_PRESETS:
+            raise web.HTTPBadRequest(reason='ytdl_options_presets must only contain configured preset names')
 
     if download_type not in VALID_DOWNLOAD_TYPES:
         raise web.HTTPBadRequest(reason=f'download_type must be one of {sorted(VALID_DOWNLOAD_TYPES)}')
@@ -466,6 +549,8 @@ def parse_download_options(post: dict) -> dict:
         'chapter_template': chapter_template,
         'subtitle_language': subtitle_language,
         'subtitle_mode': subtitle_mode,
+        'ytdl_options_presets': ytdl_options_presets,
+        'ytdl_options_overrides': ytdl_options_overrides,
     }
 
 
@@ -500,9 +585,19 @@ async def add(request):
         o['chapter_template'],
         o['subtitle_language'],
         o['subtitle_mode'],
+        o['ytdl_options_presets'],
+        o['ytdl_options_overrides'],
     )
     return web.Response(text=serializer.encode(status))
 
+
+@routes.get(config.URL_PREFIX + 'presets')
+async def presets(request):
+    return web.Response(
+        text=serializer.encode({'presets': sorted(config.YTDL_OPTIONS_PRESETS.keys())}),
+        content_type='application/json',
+    )
+
 @routes.post(config.URL_PREFIX + 'cancel-add')
 async def cancel_add(request):
     dqueue.cancel_add()
@@ -541,6 +636,8 @@ async def subscribe(request):
         chapter_template=o['chapter_template'],
         subtitle_language=o['subtitle_language'],
         subtitle_mode=o['subtitle_mode'],
+        ytdl_options_presets=o['ytdl_options_presets'],
+        ytdl_options_overrides=o['ytdl_options_overrides'],
     )
     return web.Response(text=serializer.encode(result))
 

app/subscriptions.py

@@ -145,6 +145,8 @@ class SubscriptionInfo:
     chapter_template: str = ""
     subtitle_language: str = "en"
     subtitle_mode: str = "prefer_manual"
+    ytdl_options_presets: list[str] = field(default_factory=list)
+    ytdl_options_overrides: dict[str, Any] = field(default_factory=dict)
     last_checked: Optional[float] = None
     seen_ids: list[str] = field(default_factory=list)
     error: Optional[str] = None
@@ -190,19 +192,40 @@ def _subscription_to_record(sub: SubscriptionInfo) -> dict[str, Any]:
         "chapter_template": sub.chapter_template,
         "subtitle_language": sub.subtitle_language,
         "subtitle_mode": sub.subtitle_mode,
+        "ytdl_options_presets": list(sub.ytdl_options_presets),
+        "ytdl_options_overrides": sub.ytdl_options_overrides,
         "last_checked": sub.last_checked,
         "seen_ids": list(sub.seen_ids),
         "error": sub.error,
     }
 
 
+def _normalize_subscription_record(rec: dict[str, Any]) -> dict[str, Any]:
+    """Migrate legacy ytdl_options_preset (str) to ytdl_options_presets (list)."""
+    out = dict(rec)
+    if "ytdl_options_presets" not in out:
+        old = out.pop("ytdl_options_preset", None)
+        if old is None:
+            out["ytdl_options_presets"] = []
+        elif isinstance(old, list):
+            out["ytdl_options_presets"] = [str(x).strip() for x in old if str(x).strip()]
+        elif isinstance(old, str):
+            out["ytdl_options_presets"] = [old.strip()] if old.strip() else []
+        else:
+            out["ytdl_options_presets"] = []
+    else:
+        out.pop("ytdl_options_preset", None)
+    return out
+
+
 def _subscription_from_record(record: Any) -> Optional[SubscriptionInfo]:
     field_names = {f.name for f in fields(SubscriptionInfo)}
     if isinstance(record, SubscriptionInfo):
         return record
     if isinstance(record, dict):
         try:
-            return SubscriptionInfo(**{k: v for k, v in record.items() if k in field_names})
+            normalized = _normalize_subscription_record(dict(record))
+            return SubscriptionInfo(**{k: v for k, v in normalized.items() if k in field_names})
         except TypeError:
             return None
     return None
@@ -311,9 +334,12 @@ class SubscriptionManager:
         chapter_template: str,
         subtitle_language: str,
         subtitle_mode: str,
+        ytdl_options_presets: Optional[list[str]] = None,
+        ytdl_options_overrides: Optional[dict[str, Any]] = None,
     ) -> tuple[list[str], list[str]]:
         queued_ids: list[str] = []
         queue_errors: list[str] = []
+        presets = list(ytdl_options_presets or [])
         for ent in entries:
             eid = _entry_id(ent)
             vurl = _entry_video_url(ent)
@@ -336,6 +362,8 @@ class SubscriptionManager:
                 chapter_template or None,
                 subtitle_language,
                 subtitle_mode,
+                presets,
+                ytdl_options_overrides,
             )
             if isinstance(result, dict) and result.get("status") == "error":
                 msg = str(result.get("msg") or f"Queueing failed for {vurl}")
@@ -403,6 +431,8 @@ class SubscriptionManager:
         chapter_template: str,
         subtitle_language: str,
         subtitle_mode: str,
+        ytdl_options_presets: Optional[list[str]] = None,
+        ytdl_options_overrides: Optional[dict[str, Any]] = None,
     ) -> dict:
         url = self._normalize_url(url)
         if not url:
@@ -460,6 +490,8 @@ class SubscriptionManager:
                 chapter_template=chapter_template or "",
                 subtitle_language=subtitle_language,
                 subtitle_mode=subtitle_mode,
+                ytdl_options_presets=list(ytdl_options_presets or []),
+                ytdl_options_overrides=dict(ytdl_options_overrides or {}),
                 last_checked=time.time(),
                 seen_ids=list(dict.fromkeys(all_ids)),
                 error=None,
@@ -608,6 +640,8 @@ class SubscriptionManager:
             dl_chapter = cur.chapter_template
             dl_sublang = cur.subtitle_language
             dl_submode = cur.subtitle_mode
+            dl_ytdl_presets = list(cur.ytdl_options_presets)
+            dl_ytdl_overrides = dict(cur.ytdl_options_overrides)
 
         new_entries: list[dict] = []
         new_ids: list[str] = []
@@ -632,6 +666,8 @@ class SubscriptionManager:
             chapter_template=dl_chapter or "",
             subtitle_language=dl_sublang,
             subtitle_mode=dl_submode,
+            ytdl_options_presets=dl_ytdl_presets,
+            ytdl_options_overrides=dl_ytdl_overrides,
         )
         log.info(
             "Subscription check finished for %s: %d new, %d queued, %d failed",

app/tests/test_api.py

@@ -37,6 +37,8 @@ def _valid_video_add_body(**kwargs):
         "codec": "auto",
         "format": "any",
         "quality": "best",
+        "ytdl_options_presets": [],
+        "ytdl_options_overrides": "",
     }
     base.update(kwargs)
     return base
@@ -59,6 +61,37 @@ async def test_add_ok(mock_dqueue):
     mock_dqueue.add.assert_awaited_once()
 
 
+@pytest.mark.asyncio
+async def test_add_passes_preset_and_overrides(mock_dqueue, monkeypatch):
+    monkeypatch.setattr(main.config, "YTDL_OPTIONS_PRESETS", {"Preset A": {"writesubtitles": True}})
+    monkeypatch.setattr(main.config, "ALLOW_YTDL_OPTIONS_OVERRIDES", True)
+    req = _json_request(
+        _valid_video_add_body(
+            ytdl_options_presets=["Preset A"],
+            ytdl_options_overrides='{"writesubtitles": true}',
+        )
+    )
+    resp = await main.add(req)
+    assert resp.status == 200
+    call = mock_dqueue.add.await_args
+    assert call is not None
+    assert call.args[13] == ["Preset A"]
+    assert call.args[14] == {"writesubtitles": True}
+
+
+@pytest.mark.asyncio
+async def test_add_legacy_string_preset_normalized(mock_dqueue, monkeypatch):
+    monkeypatch.setattr(main.config, "YTDL_OPTIONS_PRESETS", {"Legacy": {}})
+    body = _valid_video_add_body()
+    del body["ytdl_options_presets"]
+    body["ytdl_options_preset"] = "Legacy"
+    req = _json_request(body)
+    resp = await main.add(req)
+    assert resp.status == 200
+    call = mock_dqueue.add.await_args
+    assert call.args[13] == ["Legacy"]
+
+
 @pytest.mark.asyncio
 async def test_add_missing_url_returns_400(mock_dqueue):
     req = _json_request({"download_type": "video", "quality": "best", "format": "any"})
@@ -124,6 +157,38 @@ async def test_add_invalid_json_body(mock_dqueue):
         await main.add(req)
 
 
+@pytest.mark.asyncio
+async def test_add_invalid_ytdl_options_override_json(mock_dqueue):
+    req = _json_request(_valid_video_add_body(ytdl_options_overrides="{bad json}"))
+    with pytest.raises(web.HTTPBadRequest):
+        await main.add(req)
+
+
+@pytest.mark.asyncio
+async def test_add_rejects_ytdl_options_overrides_when_disabled(mock_dqueue):
+    req = _json_request(_valid_video_add_body(ytdl_options_overrides='{"exec": "rm -rf /"}'))
+    with pytest.raises(web.HTTPBadRequest):
+        await main.add(req)
+
+
+@pytest.mark.asyncio
+async def test_add_allows_any_ytdl_options_override_key_when_enabled(mock_dqueue, monkeypatch):
+    monkeypatch.setattr(main.config, "ALLOW_YTDL_OPTIONS_OVERRIDES", True)
+    req = _json_request(_valid_video_add_body(ytdl_options_overrides='{"exec": "echo hi"}'))
+    resp = await main.add(req)
+    assert resp.status == 200
+    call = mock_dqueue.add.await_args
+    assert call is not None
+    assert call.args[14] == {"exec": "echo hi"}
+
+
+@pytest.mark.asyncio
+async def test_add_unknown_ytdl_preset(mock_dqueue):
+    req = _json_request(_valid_video_add_body(ytdl_options_presets=["Missing"]))
+    with pytest.raises(web.HTTPBadRequest):
+        await main.add(req)
+
+
 @pytest.mark.asyncio
 async def test_delete_missing_ids(mock_dqueue):
     req = _json_request({"where": "queue"})
@@ -168,6 +233,15 @@ async def test_version_json(mock_dqueue):
     assert "yt-dlp" in body and "version" in body
 
 
+@pytest.mark.asyncio
+async def test_presets_endpoint_returns_names(mock_dqueue, monkeypatch):
+    monkeypatch.setattr(main.config, "YTDL_OPTIONS_PRESETS", {"Preset B": {}, "Preset A": {}})
+    req = MagicMock(spec=web.Request)
+    resp = await main.presets(req)
+    assert resp.status == 200
+    assert json.loads(resp.text) == {"presets": ["Preset A", "Preset B"]}
+
+
 @pytest.mark.asyncio
 async def test_cookie_status(mock_dqueue):
     req = MagicMock(spec=web.Request)

app/tests/test_config.py

@@ -33,6 +33,16 @@ class ConfigTests(unittest.TestCase):
             c = Config()
         self.assertEqual(c.YTDL_OPTIONS["quiet"], True)
 
+    def test_ytdl_option_presets_json_loaded(self):
+        presets = {"Audio extras": {"embed_thumbnail": True}}
+        with patch.dict(
+            os.environ,
+            _base_env(YTDL_OPTIONS_PRESETS=json.dumps(presets)),
+            clear=False,
+        ):
+            c = Config()
+        self.assertEqual(c.YTDL_OPTIONS_PRESETS["Audio extras"]["embed_thumbnail"], True)
+
     def test_invalid_ytdl_options_exits(self):
         with patch.dict(os.environ, _base_env(YTDL_OPTIONS="not-json"), clear=False):
             with self.assertRaises(SystemExit):
@@ -49,6 +59,12 @@ class ConfigTests(unittest.TestCase):
         safe = c.frontend_safe()
         self.assertNotIn("YTDL_OPTIONS", safe)
         self.assertNotIn("HOST", safe)
+        self.assertEqual(safe["ALLOW_YTDL_OPTIONS_OVERRIDES"], False)
+
+    def test_allow_ytdl_options_overrides_boolean_loaded(self):
+        with patch.dict(os.environ, _base_env(ALLOW_YTDL_OPTIONS_OVERRIDES="true"), clear=False):
+            c = Config()
+        self.assertTrue(c.ALLOW_YTDL_OPTIONS_OVERRIDES)
 
     def test_runtime_override_roundtrip(self):
         with patch.dict(os.environ, _base_env(), clear=False):
@@ -73,6 +89,21 @@ class ConfigTests(unittest.TestCase):
         finally:
             os.unlink(path)
 
+    def test_ytdl_option_presets_file_merges(self):
+        with tempfile.NamedTemporaryFile("w", suffix=".json", delete=False) as f:
+            json.dump({"With subtitles": {"writesubtitles": True}}, f)
+            path = f.name
+        try:
+            with patch.dict(
+                os.environ,
+                _base_env(YTDL_OPTIONS_PRESETS="{}", YTDL_OPTIONS_PRESETS_FILE=path),
+                clear=False,
+            ):
+                c = Config()
+            self.assertIn("With subtitles", c.YTDL_OPTIONS_PRESETS)
+        finally:
+            os.unlink(path)
+
 
 if __name__ == "__main__":
     unittest.main()

app/tests/test_download_queue.py

@@ -25,6 +25,7 @@ def dq_env():
         cfg.TEMP_DIR = dl
         cfg.MAX_CONCURRENT_DOWNLOADS = "3"
         cfg.YTDL_OPTIONS = {}
+        cfg.YTDL_OPTIONS_PRESETS = {}
         cfg.CUSTOM_DIRS = True
         cfg.CREATE_CUSTOM_DIRS = True
         cfg.CLEAR_COMPLETED_AFTER = "0"
@@ -175,3 +176,46 @@ async def test_add_entry_queues_single_video_without_reextracting(dq_env):
 
     assert result["status"] == "ok"
     assert dq.pending.exists("https://example.com/watch?v=1")
+
+
+@pytest.mark.asyncio
+async def test_add_merges_global_preset_and_override_options(dq_env):
+    notifier = AsyncMock()
+    dq_env.YTDL_OPTIONS = {"writesubtitles": False, "cookiefile": "/tmp/global.txt"}
+    dq_env.YTDL_OPTIONS_PRESETS = {
+        "Preset A": {"writesubtitles": True, "proxy": "http://preset-a"},
+        "Preset B": {"writesubtitles": False, "ratelimit": 1000},
+    }
+
+    def fake_extract(self, url):
+        return {
+            "_type": "video",
+            "id": "vid2",
+            "title": "Preset Video",
+            "url": url,
+            "webpage_url": url,
+        }
+
+    dq = DownloadQueue(dq_env, notifier)
+    with patch.object(DownloadQueue, "_DownloadQueue__extract_info", fake_extract):
+        result = await dq.add(
+            "https://example.com/preset",
+            "video",
+            "auto",
+            "any",
+            "best",
+            "",
+            "",
+            0,
+            auto_start=False,
+            ytdl_options_presets=["Preset A", "Preset B"],
+            ytdl_options_overrides={"proxy": "http://override", "embed_thumbnail": True},
+        )
+
+    assert result["status"] == "ok"
+    queued = dq.pending.get("https://example.com/preset")
+    assert queued.ytdl_opts["cookiefile"] == "/tmp/global.txt"
+    assert queued.ytdl_opts["writesubtitles"] is False
+    assert queued.ytdl_opts["ratelimit"] == 1000
+    assert queued.ytdl_opts["proxy"] == "http://override"
+    assert queued.ytdl_opts["embed_thumbnail"] is True

app/tests/test_main_helpers.py

@@ -99,6 +99,111 @@ class FrontendSafeTests(unittest.TestCase):
             self.assertIn(key, safe)
         self.assertNotIn("YTDL_OPTIONS", safe)
         self.assertNotIn("DOWNLOAD_DIR", safe)
+        self.assertIn("ALLOW_YTDL_OPTIONS_OVERRIDES", safe)
+
+
+class ParseYtdlOverridesTests(unittest.TestCase):
+    def test_empty_override_string_returns_empty_dict(self):
+        self.assertEqual(main._parse_ytdl_options_overrides("", enabled=False), {})
+
+    def test_rejects_non_object_json(self):
+        with self.assertRaises(main.web.HTTPBadRequest):
+            main._parse_ytdl_options_overrides('["bad"]', enabled=True)
+
+    def test_rejects_non_empty_overrides_when_disabled(self):
+        with self.assertRaises(main.web.HTTPBadRequest):
+            main._parse_ytdl_options_overrides('{"exec": "rm -rf /"}', enabled=False)
+
+    def test_allows_any_keys_when_enabled(self):
+        self.assertEqual(
+            main._parse_ytdl_options_overrides('{"exec": "rm -rf /"}', enabled=True),
+            {"exec": "rm -rf /"},
+        )
+
+
+class ParseDownloadOptionsTests(unittest.TestCase):
+    def test_accepts_known_preset_and_overrides(self):
+        previous = dict(main.config.YTDL_OPTIONS_PRESETS)
+        previous_allow = main.config.ALLOW_YTDL_OPTIONS_OVERRIDES
+        main.config.YTDL_OPTIONS_PRESETS = {"With subtitles": {"writesubtitles": True}}
+        main.config.ALLOW_YTDL_OPTIONS_OVERRIDES = True
+        try:
+            parsed = main.parse_download_options({
+                "url": "https://example.com/v",
+                "download_type": "video",
+                "codec": "auto",
+                "format": "any",
+                "quality": "best",
+                "ytdl_options_preset": "With subtitles",
+                "ytdl_options_overrides": '{"writesubtitles": true}',
+            })
+        finally:
+            main.config.YTDL_OPTIONS_PRESETS = previous
+            main.config.ALLOW_YTDL_OPTIONS_OVERRIDES = previous_allow
+        self.assertEqual(parsed["ytdl_options_presets"], ["With subtitles"])
+        self.assertEqual(parsed["ytdl_options_overrides"], {"writesubtitles": True})
+
+    def test_accepts_multiple_presets_in_order(self):
+        previous = dict(main.config.YTDL_OPTIONS_PRESETS)
+        main.config.YTDL_OPTIONS_PRESETS = {
+            "A": {"writesubtitles": True},
+            "B": {"writesubtitles": False},
+        }
+        try:
+            parsed = main.parse_download_options({
+                "url": "https://example.com/v",
+                "download_type": "video",
+                "codec": "auto",
+                "format": "any",
+                "quality": "best",
+                "ytdl_options_presets": ["A", "B"],
+            })
+        finally:
+            main.config.YTDL_OPTIONS_PRESETS = previous
+        self.assertEqual(parsed["ytdl_options_presets"], ["A", "B"])
+
+    def test_legacy_singular_preset_string_normalized_to_list(self):
+        previous = dict(main.config.YTDL_OPTIONS_PRESETS)
+        main.config.YTDL_OPTIONS_PRESETS = {"Solo": {}}
+        try:
+            parsed = main.parse_download_options({
+                "url": "https://example.com/v",
+                "download_type": "video",
+                "codec": "auto",
+                "format": "any",
+                "quality": "best",
+                "ytdl_options_preset": "Solo",
+            })
+        finally:
+            main.config.YTDL_OPTIONS_PRESETS = previous
+        self.assertEqual(parsed["ytdl_options_presets"], ["Solo"])
+
+    def test_rejects_unknown_preset(self):
+        with self.assertRaises(main.web.HTTPBadRequest):
+            main.parse_download_options({
+                "url": "https://example.com/v",
+                "download_type": "video",
+                "codec": "auto",
+                "format": "any",
+                "quality": "best",
+                "ytdl_options_presets": ["Missing preset"],
+            })
+
+    def test_rejects_unknown_preset_in_list(self):
+        previous = dict(main.config.YTDL_OPTIONS_PRESETS)
+        main.config.YTDL_OPTIONS_PRESETS = {"Known": {}}
+        try:
+            with self.assertRaises(main.web.HTTPBadRequest):
+                main.parse_download_options({
+                    "url": "https://example.com/v",
+                    "download_type": "video",
+                    "codec": "auto",
+                    "format": "any",
+                    "quality": "best",
+                    "ytdl_options_presets": ["Known", "Nope"],
+                })
+        finally:
+            main.config.YTDL_OPTIONS_PRESETS = previous
 
 
 if __name__ == "__main__":

app/tests/test_ytdl_utils.py

@@ -24,7 +24,10 @@ class _ImpersonateTarget:
 
 fake_impersonate.ImpersonateTarget = _ImpersonateTarget
 fake_networking.impersonate = fake_impersonate
-fake_utils.STR_FORMAT_RE_TMPL = r"(?P<prefix>)%\((?P<has_key>{})\)(?P<format>[-0-9.]*{})"
+# The inner ``key`` group mirrors the real ``STR_FORMAT_RE_TMPL`` so that
+# ``_OUTTMPL_FIELD_RE`` (compiled at import time) has the named group that
+# ``_resolve_outtmpl_fields`` reads via ``match.group('key')``.
+fake_utils.STR_FORMAT_RE_TMPL = r"(?P<prefix>)%\((?P<has_key>(?P<key>{}))\)(?P<format>[-0-9.]*{})"
 fake_utils.STR_FORMAT_TYPES = "diouxXeEfFgGcrsa"
 fake_yt_dlp.networking = fake_networking
 fake_yt_dlp.utils = fake_utils
@@ -37,11 +40,15 @@ from ytdl import (
     DownloadInfo,
     _compact_persisted_entry,
     _convert_srt_to_txt_file,
-    _outtmpl_substitute_field,
+    _resolve_outtmpl_fields,
     _sanitize_entry_for_pickle,
     _sanitize_path_component,
 )
 
+# Detect whether the real yt-dlp is loaded (as opposed to the minimal fake
+# shim above).  _resolve_outtmpl_fields needs YoutubeDL at runtime.
+_has_real_ytdlp = hasattr(sys.modules.get("yt_dlp"), "YoutubeDL")
+
 
 class SanitizePathComponentTests(unittest.TestCase):
     def test_replaces_windows_invalid_chars(self):
@@ -52,15 +59,68 @@ class SanitizePathComponentTests(unittest.TestCase):
         self.assertEqual(_sanitize_path_component(42), 42)
 
 
-class OuttmplSubstituteFieldTests(unittest.TestCase):
-    def test_simple_substitution(self):
-        self.assertEqual(_outtmpl_substitute_field("%(title)s", "title", "Hello"), "Hello")
+@unittest.skipUnless(_has_real_ytdlp, "requires real yt-dlp")
+class ResolveOuttmplFieldsTests(unittest.TestCase):
+    """Tests for _resolve_outtmpl_fields (delegates to yt-dlp's template engine)."""
+
+    def test_simple_playlist_substitution(self):
+        info = {"playlist_title": "My PL", "playlist_index": "03"}
+        result = _resolve_outtmpl_fields("%(playlist_title)s/%(title)s.%(ext)s", info, ("playlist",))
+        self.assertEqual(result, "My PL/%(title)s.%(ext)s")
 
     def test_format_spec_int(self):
-        self.assertEqual(_outtmpl_substitute_field("%(idx)02d", "idx", 3), "03")
+        info = {"playlist_index": "3"}
+        result = _resolve_outtmpl_fields("%(playlist_index)02d-%(title)s", info, ("playlist",))
+        self.assertEqual(result, "03-%(title)s")
 
-    def test_missing_field_unchanged(self):
-        self.assertEqual(_outtmpl_substitute_field("%(other)s", "title", "x"), "%(other)s")
+    def test_non_targeted_fields_unchanged(self):
+        info = {"playlist_title": "PL"}
+        result = _resolve_outtmpl_fields("%(title)s/%(ext)s", info, ("playlist",))
+        self.assertEqual(result, "%(title)s/%(ext)s")
+
+    def test_default_value(self):
+        info = {"playlist_index": "1"}
+        result = _resolve_outtmpl_fields("%(playlist_title|Unknown)s/%(playlist_index)s", info, ("playlist",))
+        self.assertEqual(result, "Unknown/1")
+
+    def test_channel_prefix(self):
+        info = {"channel": "MyChan", "channel_index": "05"}
+        result = _resolve_outtmpl_fields("%(channel)s/%(channel_index)02d-%(title)s", info, ("channel",))
+        self.assertEqual(result, "MyChan/05-%(title)s")
+
+    def test_math_operation(self):
+        info = {"playlist_index": "3"}
+        result = _resolve_outtmpl_fields("%(playlist_index+100)d", info, ("playlist",))
+        self.assertEqual(result, "103")
+
+    def test_playlist_count_and_autonumber(self):
+        info = {
+            "playlist_title": "My PL",
+            "playlist_index": "03",
+            "playlist_count": 10,
+            "playlist_autonumber": 3,
+            "n_entries": 10,
+            "__last_playlist_index": 10,
+        }
+        result = _resolve_outtmpl_fields(
+            "%(playlist_title)s/%(playlist_autonumber)s of %(playlist_count)s - %(title)s.%(ext)s",
+            info,
+            ("playlist",),
+        )
+        # playlist_autonumber is auto-padded by yt-dlp using __last_playlist_index
+        self.assertEqual(result, "My PL/03 of 10 - %(title)s.%(ext)s")
+
+    def test_conditional_playlist_index(self):
+        info = {
+            "playlist_index": "5",
+            "playlist_count": 10,
+        }
+        result = _resolve_outtmpl_fields(
+            "%(playlist_index&{} - |)s%(title)s.%(ext)s",
+            info,
+            ("playlist",),
+        )
+        self.assertEqual(result, "5 - %(title)s.%(ext)s")
 
 
 class SanitizeEntryForPickleTests(unittest.TestCase):
@@ -219,8 +279,12 @@ class CompactPersistedEntryTests(unittest.TestCase):
         entry = {
             "playlist_index": "01",
             "playlist_title": "Playlist",
+            "playlist_count": 10,
+            "playlist_autonumber": 1,
             "channel_index": "02",
             "channel_title": "Channel",
+            "n_entries": 10,
+            "__last_playlist_index": 10,
             "formats": [{"id": "huge"}],
             "description": "big blob",
         }
@@ -232,8 +296,12 @@ class CompactPersistedEntryTests(unittest.TestCase):
             {
                 "playlist_index": "01",
                 "playlist_title": "Playlist",
+                "playlist_count": 10,
+                "playlist_autonumber": 1,
                 "channel_index": "02",
                 "channel_title": "Channel",
+                "n_entries": 10,
+                "__last_playlist_index": 10,
             },
         )
 

app/ytdl.py

@@ -13,7 +13,6 @@ import logging
 import re
 import types
 from typing import Any, Optional
-from functools import lru_cache
 
 import yt_dlp.networking.impersonate
 from yt_dlp.utils import STR_FORMAT_RE_TMPL, STR_FORMAT_TYPES
@@ -24,13 +23,6 @@ from state_store import AtomicJsonStore, from_json_compatible, read_legacy_shelf
 log = logging.getLogger('ytdl')
 
 
-@lru_cache(maxsize=None)
-def _compile_outtmpl_pattern(field: str) -> re.Pattern:
-    """Compile a regex pattern to match a specific field in an output template, including optional format specifiers."""
-    conversion_types = f"[{re.escape(STR_FORMAT_TYPES)}]"
-    return re.compile(STR_FORMAT_RE_TMPL.format(re.escape(field), conversion_types))
-
-
 # Characters that are invalid in Windows/NTFS path components. These are pre-
 # sanitised when substituting playlist/channel titles into output templates so
 # that downloads do not fail on NTFS-mounted volumes or Windows Docker hosts.
@@ -41,44 +33,51 @@ def _sanitize_path_component(value: Any) -> Any:
     """Replace characters that are invalid in Windows path components with '_'.
 
     Non-string values (int, float, None, …) are passed through unchanged so
-    that ``_outtmpl_substitute_field`` can still coerce them with format specs
-    (e.g. ``%(playlist_index)02d``).  Only string values are sanitised because
-    Windows-invalid characters are only a concern for human-readable strings
-    (titles, channel names, etc.) that may end up as directory names.
+    that numeric format specs (e.g. ``%(playlist_index)02d``) still work.
+    Only string values are sanitised because Windows-invalid characters are
+    only a concern for human-readable strings (titles, channel names, etc.)
+    that may end up as directory names.
     """
     if not isinstance(value, str):
         return value
     return _WINDOWS_INVALID_PATH_CHARS.sub('_', value)
 
 
-def _outtmpl_substitute_field(template: str, field: str, value: Any) -> str:
-    """Substitute a single field in an output template, applying any format specifiers to the value."""
-    pattern = _compile_outtmpl_pattern(field)
+# Regex matching yt-dlp output-template field references, e.g. ``%(title)s``
+# or ``%(playlist_index)03d``.  Built from yt-dlp's own ``STR_FORMAT_RE_TMPL``
+# so that it stays in sync with upstream changes to the template syntax.
+_OUTTMPL_FIELD_RE = re.compile(
+    STR_FORMAT_RE_TMPL.format('[^)]+', f'[{STR_FORMAT_TYPES}ljhqBUDS]')
+)
 
-    def replacement(match: re.Match) -> str:
-        if match.group("has_key") is None:
-            return match.group(0)
 
-        prefix = match.group("prefix") or ""
-        format_spec = match.group("format")
+def _resolve_outtmpl_fields(template: str, info_dict: dict, prefixes: tuple[str, ...]) -> str:
+    """Resolve specific fields in an output template using yt-dlp's template engine.
 
-        if not format_spec:
-            return f"{prefix}{value}"
+    Only field references whose root name starts with one of *prefixes* are
+    evaluated.  All other references are left untouched so that yt-dlp can
+    resolve them later during the actual download.
 
-        conversion_type = format_spec[-1]
-        try:
-            if conversion_type in "diouxX":
-                coerced_value = int(value)
-            elif conversion_type in "eEfFgG":
-                coerced_value = float(value)
-            else:
-                coerced_value = value
+    This delegates to ``YoutubeDL.evaluate_outtmpl`` for each targeted field
+    reference, giving access to the full yt-dlp template syntax (defaults,
+    conditional formatting, math operations, datetime formatting, etc.).
+    """
+    matches = list(_OUTTMPL_FIELD_RE.finditer(template))
+    if not matches:
+        return template
 
-            return f"{prefix}{('%' + format_spec) % coerced_value}"
-        except (ValueError, TypeError):
-            return f"{prefix}{value}"
+    with yt_dlp.YoutubeDL({'quiet': True}) as ydl:
+        for match in reversed(matches):
+            key = match.group('key')
+            if key is None:
+                continue
+            root = re.match(r'\w+', key)
+            if root is None or not root.group(0).startswith(prefixes):
+                continue
+            resolved = ydl.evaluate_outtmpl(match.group(0), info_dict)
+            template = template[:match.start()] + resolved + template[match.end():]
 
-    return pattern.sub(replacement, template)
+    return template
 
 _MAX_ENTRY_SANITIZE_DEPTH = 64
 
@@ -189,6 +188,8 @@ class DownloadInfo:
         chapter_template,
         subtitle_language="en",
         subtitle_mode="prefer_manual",
+        ytdl_options_presets=None,
+        ytdl_options_overrides=None,
     ):
         self.id = id if len(custom_name_prefix) == 0 else f'{custom_name_prefix}.{id}'
         self.title = title if len(custom_name_prefix) == 0 else f'{custom_name_prefix}.{title}'
@@ -211,6 +212,8 @@ class DownloadInfo:
         self.chapter_template = chapter_template
         self.subtitle_language = subtitle_language
         self.subtitle_mode = subtitle_mode
+        self.ytdl_options_presets = list(ytdl_options_presets or [])
+        self.ytdl_options_overrides = dict(ytdl_options_overrides or {})
         self.subtitle_files = []
 
     def __setstate__(self, state):
@@ -263,6 +266,16 @@ class DownloadInfo:
             self.subtitle_language = "en"
         if not hasattr(self, "subtitle_mode"):
             self.subtitle_mode = "prefer_manual"
+        legacy_preset = self.__dict__.pop("ytdl_options_preset", None)
+        if "ytdl_options_presets" not in self.__dict__:
+            if isinstance(legacy_preset, str) and legacy_preset.strip():
+                self.ytdl_options_presets = [legacy_preset.strip()]
+            elif isinstance(legacy_preset, list):
+                self.ytdl_options_presets = [str(x).strip() for x in legacy_preset if str(x).strip()]
+            else:
+                self.ytdl_options_presets = []
+        if not hasattr(self, "ytdl_options_overrides"):
+            self.ytdl_options_overrides = {}
         if not hasattr(self, "entry"):
             self.entry = None
         if not hasattr(self, "subtitle_files"):
@@ -286,6 +299,8 @@ _PERSISTED_DOWNLOAD_FIELDS = (
     "chapter_template",
     "subtitle_language",
     "subtitle_mode",
+    "ytdl_options_presets",
+    "ytdl_options_overrides",
     "status",
     "timestamp",
     "error",
@@ -296,13 +311,16 @@ _PERSISTED_DOWNLOAD_FIELDS = (
 )
 
 
+_COMPACT_ENTRY_EXTRA_KEYS = frozenset(("n_entries", "__last_playlist_index"))
+
+
 def _compact_persisted_entry(entry: Any) -> Optional[dict[str, Any]]:
     if not isinstance(entry, dict):
         return None
     compact = {
         key: value
         for key, value in entry.items()
-        if key.startswith("playlist") or key.startswith("channel")
+        if key.startswith("playlist") or key.startswith("channel") or key in _COMPACT_ENTRY_EXTRA_KEYS
     }
     return compact or None
 
@@ -818,16 +836,17 @@ class DownloadQueue:
         if entry is not None and entry.get('playlist_index') is not None:
             if len(self.config.OUTPUT_TEMPLATE_PLAYLIST):
                 output = self.config.OUTPUT_TEMPLATE_PLAYLIST
-            for property, value in entry.items():
-                if property.startswith("playlist"):
-                    output = _outtmpl_substitute_field(output, property, _sanitize_path_component(value))
+            sanitized = {k: _sanitize_path_component(v) for k, v in entry.items()}
+            output = _resolve_outtmpl_fields(output, sanitized, ('playlist',))
         if entry is not None and entry.get('channel_index') is not None:
             if len(self.config.OUTPUT_TEMPLATE_CHANNEL):
                 output = self.config.OUTPUT_TEMPLATE_CHANNEL
-            for property, value in entry.items():
-                if property.startswith("channel"):
-                    output = _outtmpl_substitute_field(output, property, _sanitize_path_component(value))
+            sanitized = {k: _sanitize_path_component(v) for k, v in entry.items()}
+            output = _resolve_outtmpl_fields(output, sanitized, ('channel',))
         ytdl_options = dict(self.config.YTDL_OPTIONS)
+        for preset_name in getattr(dl, 'ytdl_options_presets', None) or []:
+            ytdl_options.update(self.config.YTDL_OPTIONS_PRESETS.get(preset_name, {}))
+        ytdl_options.update(getattr(dl, 'ytdl_options_overrides', {}) or {})
         playlist_item_limit = getattr(dl, 'playlist_item_limit', 0)
         if playlist_item_limit > 0:
             log.info(f'playlist limit is set. Processing only first {playlist_item_limit} entries')
@@ -855,6 +874,8 @@ class DownloadQueue:
         chapter_template,
         subtitle_language,
         subtitle_mode,
+        ytdl_options_presets,
+        ytdl_options_overrides,
         already,
         _add_gen=None,
     ):
@@ -887,6 +908,8 @@ class DownloadQueue:
                 chapter_template,
                 subtitle_language,
                 subtitle_mode,
+                ytdl_options_presets,
+                ytdl_options_overrides,
                 already,
                 _add_gen,
             )
@@ -896,8 +919,9 @@ class DownloadQueue:
             # Convert generator to list if needed (for len() and slicing operations)
             if isinstance(entries, types.GeneratorType):
                 entries = list(entries)
-            log.info(f'{etype} detected with {len(entries)} entries')
-            index_digits = len(str(len(entries)))
+            total_entries = len(entries)
+            log.info(f'{etype} detected with {total_entries} entries')
+            index_digits = len(str(total_entries))
             results = []
             if playlist_item_limit > 0:
                 log.info(f'Item limit is set. Processing only first {playlist_item_limit} entries')
@@ -909,6 +933,12 @@ class DownloadQueue:
                 etr["_type"] = "video"
                 etr[etype] = entry.get("id") or entry.get("channel_id") or entry.get("channel")
                 etr[f"{etype}_index"] = '{{0:0{0:d}d}}'.format(index_digits).format(index)
+                etr[f"{etype}_count"] = total_entries
+                etr[f"{etype}_autonumber"] = index
+                # n_entries: standard yt-dlp field for total count (used by template engine)
+                # __last_playlist_index: yt-dlp internal field for auto-padding autonumber
+                etr["n_entries"] = total_entries
+                etr["__last_playlist_index"] = total_entries
                 for property in ("id", "title", "uploader", "uploader_id"):
                     if property in entry:
                         etr[f"{etype}_{property}"] = entry[property]
@@ -927,6 +957,8 @@ class DownloadQueue:
                         chapter_template,
                         subtitle_language,
                         subtitle_mode,
+                        ytdl_options_presets,
+                        ytdl_options_overrides,
                         already,
                         _add_gen,
                     )
@@ -958,6 +990,8 @@ class DownloadQueue:
                     chapter_template=chapter_template,
                     subtitle_language=subtitle_language,
                     subtitle_mode=subtitle_mode,
+                    ytdl_options_presets=ytdl_options_presets,
+                    ytdl_options_overrides=ytdl_options_overrides,
                 )
                 await self.__add_download(dl, auto_start)
             return {'status': 'ok'}
@@ -978,13 +1012,17 @@ class DownloadQueue:
         chapter_template=None,
         subtitle_language="en",
         subtitle_mode="prefer_manual",
+        ytdl_options_presets=None,
+        ytdl_options_overrides=None,
         already=None,
         _add_gen=None,
     ):
+        if ytdl_options_presets is None:
+            ytdl_options_presets = []
         log.info(
             f'adding {url}: {download_type=} {codec=} {format=} {quality=} {already=} {folder=} {custom_name_prefix=} '
             f'{playlist_item_limit=} {auto_start=} {split_by_chapters=} {chapter_template=} '
-            f'{subtitle_language=} {subtitle_mode=}'
+            f'{subtitle_language=} {subtitle_mode=} {ytdl_options_presets=}'
         )
         if already is None:
             _add_gen = self._add_generation
@@ -1013,6 +1051,8 @@ class DownloadQueue:
             chapter_template,
             subtitle_language,
             subtitle_mode,
+            ytdl_options_presets,
+            ytdl_options_overrides,
             already,
             _add_gen,
         )
@@ -1032,7 +1072,11 @@ class DownloadQueue:
         chapter_template=None,
         subtitle_language="en",
         subtitle_mode="prefer_manual",
+        ytdl_options_presets=None,
+        ytdl_options_overrides=None,
     ):
+        if ytdl_options_presets is None:
+            ytdl_options_presets = []
         normalized_entry = copy.deepcopy(entry) if isinstance(entry, dict) else entry
         already = set()
         return await self.__add_entry(
@@ -1049,6 +1093,8 @@ class DownloadQueue:
             chapter_template,
             subtitle_language,
             subtitle_mode,
+            ytdl_options_presets,
+            ytdl_options_overrides,
             already,
             None,
         )

ui/package.json

@@ -23,14 +23,14 @@
   },
   "private": true,
   "dependencies": {
-    "@angular/animations": "^21.2.6",
-    "@angular/common": "^21.2.6",
-    "@angular/compiler": "^21.2.6",
-    "@angular/core": "^21.2.6",
-    "@angular/forms": "^21.2.6",
-    "@angular/platform-browser": "^21.2.6",
-    "@angular/platform-browser-dynamic": "^21.2.6",
-    "@angular/service-worker": "^21.2.6",
+    "@angular/animations": "^21.2.7",
+    "@angular/common": "^21.2.7",
+    "@angular/compiler": "^21.2.7",
+    "@angular/core": "^21.2.7",
+    "@angular/forms": "^21.2.7",
+    "@angular/platform-browser": "^21.2.7",
+    "@angular/platform-browser-dynamic": "^21.2.7",
+    "@angular/service-worker": "^21.2.7",
     "@fortawesome/angular-fontawesome": "~4.0.0",
     "@fortawesome/fontawesome-svg-core": "^7.2.0",
     "@fortawesome/free-brands-svg-icons": "^7.2.0",
@@ -48,10 +48,10 @@
   },
   "devDependencies": {
     "@angular-eslint/builder": "21.1.0",
-    "@angular/build": "^21.2.5",
-    "@angular/cli": "^21.2.5",
-    "@angular/compiler-cli": "^21.2.6",
-    "@angular/localize": "^21.2.6",
+    "@angular/build": "^21.2.6",
+    "@angular/cli": "^21.2.6",
+    "@angular/compiler-cli": "^21.2.7",
+    "@angular/localize": "^21.2.7",
     "@eslint/js": "^9.39.4",
     "angular-eslint": "21.1.0",
     "eslint": "^9.39.4",

ui/src/app/app.html

@@ -369,23 +369,10 @@
       <div class="row">
         <div class="col-12">
           <div class="collapse show" id="advancedOptions" [ngbCollapse]="!isAdvancedOpen">
-            <div class="py-2">
-              <!-- Advanced Settings -->
-              <div class="row g-3 mb-2">
-                <div class="col-md-6">
-                  <div class="input-group">
-                    <span class="input-group-text">Auto Start</span>
-                    <select class="form-select"
-                      name="autoStart"
-                      [(ngModel)]="autoStart"
-                      (change)="autoStartChanged()"
-                      [disabled]="addInProgress || subscribeInProgress || downloads.loading"
-                      ngbTooltip="Automatically start downloads when added">
-                      <option [ngValue]="true">Yes</option>
-                      <option [ngValue]="false">No</option>
-                    </select>
-                  </div>
-                </div>
+            <div class="pt-1 pb-2">
+              <!-- Output -->
+              <div class="settings-section-label">Output</div>
+              <div class="row g-3">
                 <div class="col-md-6">
                   <div class="input-group">
                     <span class="input-group-text">Download Folder</span>
@@ -405,7 +392,6 @@
                       ngbTooltip="Choose where to save downloads. Type to create a new folder." />
                   }
                   </div>
-
                 </div>
                 <div class="col-md-6">
                   <div class="input-group">
@@ -419,6 +405,48 @@
                       ngbTooltip="Add a prefix to downloaded filenames">
                   </div>
                 </div>
+                <div class="col-12">
+                  <div class="row g-2 align-items-center">
+                    <div class="col-auto">
+                      <div class="form-check form-switch">
+                        <input class="form-check-input" type="checkbox" role="switch" id="checkbox-split-chapters"
+                          name="splitByChapters" [(ngModel)]="splitByChapters" (change)="splitByChaptersChanged()"
+                          [disabled]="addInProgress || subscribeInProgress || downloads.loading"
+                          ngbTooltip="Split video into separate files by chapters">
+                        <label class="form-check-label" for="checkbox-split-chapters">Split by chapters</label>
+                      </div>
+                    </div>
+                    @if (splitByChapters) {
+                    <div class="col">
+                      <div class="input-group">
+                        <span class="input-group-text">Template</span>
+                        <input type="text" class="form-control" name="chapterTemplate" [(ngModel)]="chapterTemplate"
+                          (change)="chapterTemplateChanged()" [disabled]="addInProgress || subscribeInProgress || downloads.loading"
+                          ngbTooltip="Output template for chapter files">
+                      </div>
+                    </div>
+                    }
+                  </div>
+                </div>
+              </div>
+
+              <!-- Behavior -->
+              <div class="settings-section-label">Behavior</div>
+              <div class="row g-3">
+                <div class="col-md-6">
+                  <div class="input-group">
+                    <span class="input-group-text">Auto Start</span>
+                    <select class="form-select"
+                      name="autoStart"
+                      [(ngModel)]="autoStart"
+                      (change)="autoStartChanged()"
+                      [disabled]="addInProgress || subscribeInProgress || downloads.loading"
+                      ngbTooltip="Automatically start downloads when added">
+                      <option [ngValue]="true">Yes</option>
+                      <option [ngValue]="false">No</option>
+                    </select>
+                  </div>
+                </div>
                 <div class="col-md-6">
                   <div class="input-group">
                     <span class="input-group-text">Items Limit</span>
@@ -447,100 +475,109 @@
                       ngbTooltip="How often to poll subscriptions for new videos">
                   </div>
                 </div>
-                <div class="col-12">
-                  <div class="row g-2 align-items-center">
-                    <div class="col-auto">
-                      <div class="form-check form-switch">
-                        <input class="form-check-input" type="checkbox" role="switch" id="checkbox-split-chapters"
-                          name="splitByChapters" [(ngModel)]="splitByChapters" (change)="splitByChaptersChanged()"
-                          [disabled]="addInProgress || subscribeInProgress || downloads.loading"
-                          ngbTooltip="Split video into separate files by chapters">
-                        <label class="form-check-label" for="checkbox-split-chapters">Split by chapters</label>
-                      </div>
-                    </div>
-                    @if (splitByChapters) {
-                    <div class="col">
-                      <div class="input-group">
-                        <span class="input-group-text">Template</span>
-                        <input type="text" class="form-control" name="chapterTemplate" [(ngModel)]="chapterTemplate"
-                          (change)="chapterTemplateChanged()" [disabled]="addInProgress || subscribeInProgress || downloads.loading"
-                          ngbTooltip="Output template for chapter files">
-                      </div>
-                    </div>
+              </div>
+
+              <!-- yt-dlp -->
+              <div class="settings-section-label">yt-dlp</div>
+              <div class="row g-3">
+                <div class="col-12" [class.col-md-6]="allowYtdlOptionsOverrides()">
+                  <div class="input-group">
+                    <span class="input-group-text">Option Presets</span>
+                    <ng-select
+                      class="flex-grow-1"
+                      name="ytdlOptionsPresets"
+                      [items]="ytdlOptionPresetNames"
+                      [multiple]="true"
+                      [closeOnSelect]="false"
+                      placeholder="Default"
+                      [(ngModel)]="ytdlOptionsPresets"
+                      (ngModelChange)="ytdlOptionsPresetsChanged()"
+                      [disabled]="addInProgress || subscribeInProgress || downloads.loading"
+                      ngbTooltip="Choose one or more yt-dlp option presets configured on the server (applied in order)" />
+                  </div>
+                </div>
+                @if (allowYtdlOptionsOverrides()) {
+                <div class="col-md-6">
+                  <div class="input-group">
+                    <span class="input-group-text">Custom yt-dlp Options</span>
+                    <input type="text"
+                      class="form-control"
+                      placeholder='e.g. {"writesubtitles": true}'
+                      name="ytdlOptionsOverrides"
+                      [(ngModel)]="ytdlOptionsOverrides"
+                      (change)="ytdlOptionsOverridesChanged()"
+                      [disabled]="addInProgress || subscribeInProgress || downloads.loading"
+                      ngbTooltip="Optional per-download yt-dlp overrides as a JSON object">
+                  </div>
+                </div>
+                }
+              </div>
+
+              <!-- Tools -->
+              <div class="settings-section-label">Tools</div>
+              <div class="row g-3">
+                <div class="col-md-4">
+                  <div class="action-group-label">Cookies</div>
+                  <input type="file" id="cookie-upload" class="d-none" accept=".txt"
+                    (change)="onCookieFileSelect($event)"
+                    [disabled]="cookieUploadInProgress || addInProgress">
+                  <div class="btn-group w-100" role="group">
+                    <label class="btn mb-0"
+                      [class]="hasCookies ? 'btn cookie-active-btn mb-0' : 'btn cookie-btn mb-0'"
+                      [class.disabled]="cookieUploadInProgress || addInProgress"
+                      for="cookie-upload"
+                      ngbTooltip="Upload a cookies.txt file for authenticated downloads">
+                      @if (cookieUploadInProgress) {
+                        <span class="spinner-border spinner-border-sm me-2" role="status"></span>
+                      } @else {
+                        <fa-icon [icon]="faUpload" class="me-2" />
+                      }
+                      {{ hasCookies ? 'Replace Cookies' : 'Upload Cookies' }}
+                    </label>
+                    @if (hasCookies) {
+                      <button type="button" class="btn btn-outline-danger"
+                        (click)="deleteCookies()"
+                        [disabled]="cookieUploadInProgress || addInProgress"
+                        ngbTooltip="Remove uploaded cookies">
+                        <fa-icon [icon]="faTrashAlt" />
+                      </button>
+                    }
+                  </div>
+                  <div class="cookie-status" [class.active]="hasCookies">
+                    @if (hasCookies) {
+                      <fa-icon [icon]="faCheckCircle" class="me-1" />
+                      Cookies active
+                    } @else {
+                      No cookies configured
                     }
                   </div>
                 </div>
-              </div>
-
-              <!-- Advanced Actions -->
-              <div class="row">
-                <div class="col-12">
-                  <hr class="my-3">
-                  <div class="row g-3">
-                    <div class="col-md-4">
-                      <div class="action-group-label">Cookies</div>
-                      <input type="file" id="cookie-upload" class="d-none" accept=".txt"
-                        (change)="onCookieFileSelect($event)"
-                        [disabled]="cookieUploadInProgress || addInProgress">
-                      <div class="btn-group w-100" role="group">
-                        <label class="btn mb-0"
-                          [class]="hasCookies ? 'btn cookie-active-btn mb-0' : 'btn cookie-btn mb-0'"
-                          [class.disabled]="cookieUploadInProgress || addInProgress"
-                          for="cookie-upload"
-                          ngbTooltip="Upload a cookies.txt file for authenticated downloads">
-                          @if (cookieUploadInProgress) {
-                            <span class="spinner-border spinner-border-sm me-2" role="status"></span>
-                          } @else {
-                            <fa-icon [icon]="faUpload" class="me-2" />
-                          }
-                          {{ hasCookies ? 'Replace Cookies' : 'Upload Cookies' }}
-                        </label>
-                        @if (hasCookies) {
-                          <button type="button" class="btn btn-outline-danger"
-                            (click)="deleteCookies()"
-                            [disabled]="cookieUploadInProgress || addInProgress"
-                            ngbTooltip="Remove uploaded cookies">
-                            <fa-icon [icon]="faTrashAlt" />
-                          </button>
-                        }
-                      </div>
-                      <div class="cookie-status" [class.active]="hasCookies">
-                        @if (hasCookies) {
-                          <fa-icon [icon]="faCheckCircle" class="me-1" />
-                          Cookies active
-                        } @else {
-                          No cookies configured
-                        }
-                      </div>
+                <div class="col-md-8">
+                  <div class="action-group-label">Bulk Actions</div>
+                  <div class="row g-2">
+                    <div class="col-4">
+                      <button type="button"
+                        class="btn btn-secondary w-100"
+                        (click)="openBatchImportModal()">
+                        <fa-icon [icon]="faFileImport" class="me-2" />
+                        Import URLs
+                      </button>
                     </div>
-                    <div class="col-md-8">
-                      <div class="action-group-label">Bulk Actions</div>
-                      <div class="row g-2">
-                        <div class="col-4">
-                          <button type="button"
-                            class="btn btn-secondary w-100"
-                            (click)="openBatchImportModal()">
-                            <fa-icon [icon]="faFileImport" class="me-2" />
-                            Import URLs
-                          </button>
-                        </div>
-                        <div class="col-4">
-                          <button type="button"
-                            class="btn btn-secondary w-100"
-                            (click)="exportBatchUrls('all')">
-                            <fa-icon [icon]="faFileExport" class="me-2" />
-                            Export URLs
-                          </button>
-                        </div>
-                        <div class="col-4">
-                          <button type="button"
-                            class="btn btn-secondary w-100"
-                            (click)="copyBatchUrls('all')">
-                            <fa-icon [icon]="faCopy" class="me-2" />
-                            Copy URLs
-                          </button>
-                        </div>
-                      </div>
+                    <div class="col-4">
+                      <button type="button"
+                        class="btn btn-secondary w-100"
+                        (click)="exportBatchUrls('all')">
+                        <fa-icon [icon]="faFileExport" class="me-2" />
+                        Export URLs
+                      </button>
+                    </div>
+                    <div class="col-4">
+                      <button type="button"
+                        class="btn btn-secondary w-100"
+                        (click)="copyBatchUrls('all')">
+                        <fa-icon [icon]="faCopy" class="me-2" />
+                        Copy URLs
+                      </button>
                     </div>
                   </div>
                 </div>

ui/src/app/app.sass

@@ -182,6 +182,18 @@ main
     opacity: 0.65
     pointer-events: none
 
+.settings-section-label
+  font-size: 0.8rem
+  text-transform: uppercase
+  letter-spacing: 0.1em
+  font-weight: 600
+  color: var(--bs-body-color)
+  margin-top: 1.75rem
+  margin-bottom: 0.75rem
+
+  &:first-child
+    margin-top: 0
+
 .action-group-label
   font-size: 0.7rem
   text-transform: uppercase

ui/src/app/app.spec.ts

@@ -1,7 +1,101 @@
 import { TestBed } from '@angular/core/testing';
+import { HttpClient } from '@angular/common/http';
+import { Subject, of } from 'rxjs';
 import { App } from './app';
+import { DownloadsService } from './services/downloads.service';
+import { SubscriptionsService } from './services/subscriptions.service';
+import { CookieService } from 'ngx-cookie-service';
+
+class DownloadsServiceStub {
+  loading = false;
+  queue = new Map();
+  done = new Map();
+  configuration: Record<string, unknown> = { CUSTOM_DIRS: true, CREATE_CUSTOM_DIRS: true, ALLOW_YTDL_OPTIONS_OVERRIDES: false };
+  customDirs = { download_dir: [], audio_download_dir: [] };
+  queueChanged = new Subject<void>();
+  doneChanged = new Subject<void>();
+  configurationChanged = new Subject<Record<string, unknown>>();
+  customDirsChanged = new Subject<Record<string, string[]>>();
+  ytdlOptionsChanged = new Subject<Record<string, unknown>>();
+  updated = new Subject<void>();
+
+  getCookieStatus() {
+    return of({ status: 'ok', has_cookies: false });
+  }
+
+  getPresets() {
+    return of({ presets: ['Preset A'] });
+  }
+
+  add() {
+    return of({ status: 'ok' as const });
+  }
+
+  cancelAdd() {
+    return of({ status: 'ok' as const });
+  }
+
+  startById() {
+    return of({});
+  }
+
+  delById() {
+    return of({});
+  }
+
+  delByFilter() {
+    return of({});
+  }
+
+  startByFilter() {
+    return of({});
+  }
+
+  uploadCookies() {
+    return of({ status: 'ok' });
+  }
+
+  deleteCookies() {
+    return of({ status: 'ok' });
+  }
+}
+
+class SubscriptionsServiceStub {
+  subscriptions = new Map();
+  subscriptionsChanged = new Subject<void>();
+
+  subscribe() {
+    return of({ status: 'ok' as const });
+  }
+
+  delete() {
+    return of({});
+  }
+
+  refreshList() {
+    return of([]);
+  }
+}
+
+class CookieServiceStub {
+  private cookies = new Map<string, string>();
+
+  get(name: string) {
+    return this.cookies.get(name) ?? '';
+  }
+
+  set(name: string, value: string) {
+    this.cookies.set(name, value);
+  }
+
+  check(name: string) {
+    return this.cookies.has(name);
+  }
+}
 
 describe('App', () => {
+  let downloads: DownloadsServiceStub;
+
   beforeEach(async () => {
     Object.defineProperty(window, 'matchMedia', {
       writable: true,
@@ -15,8 +109,20 @@ describe('App', () => {
         dispatchEvent: vi.fn(),
       })),
     });
+    downloads = new DownloadsServiceStub();
     await TestBed.configureTestingModule({
       imports: [App],
+      providers: [
+        { provide: DownloadsService, useValue: downloads },
+        { provide: SubscriptionsService, useClass: SubscriptionsServiceStub },
+        { provide: CookieService, useClass: CookieServiceStub },
+        {
+          provide: HttpClient,
+          useValue: {
+            get: vi.fn().mockReturnValue(of({ 'yt-dlp': 'test', version: 'test' })),
+          },
+        },
+      ],
     }).compileComponents();
   });
 
@@ -25,4 +131,48 @@ describe('App', () => {
     const app = fixture.componentInstance;
     expect(app).toBeTruthy();
   });
+
+  it('hides manual override input when disabled', () => {
+    const fixture = TestBed.createComponent(App);
+    fixture.componentInstance.isAdvancedOpen = true;
+    fixture.detectChanges();
+
+    const root = fixture.nativeElement as HTMLElement;
+    expect(root.querySelector('input[name="ytdlOptionsOverrides"]')).toBeNull();
+
+    const presetWrapper = root.querySelector('ng-select[name="ytdlOptionsPresets"]')?.closest('.col-12');
+    expect(presetWrapper?.classList.contains('col-md-6')).toBe(false);
+
+    const presetRow = root.querySelector('ng-select[name="ytdlOptionsPresets"]')?.closest('.row');
+    expect(presetRow?.querySelector('input[name="checkIntervalMinutes"]')).toBeNull();
+  });
+
+  it('shows manual override input when enabled', () => {
+    downloads.configuration['ALLOW_YTDL_OPTIONS_OVERRIDES'] = true;
+
+    const fixture = TestBed.createComponent(App);
+    fixture.componentInstance.isAdvancedOpen = true;
+    fixture.detectChanges();
+
+    const root = fixture.nativeElement as HTMLElement;
+    expect(root.querySelector('input[name="ytdlOptionsOverrides"]')).not.toBeNull();
+
+    const presetWrapper = root.querySelector('ng-select[name="ytdlOptionsPresets"]')?.closest('.col-12');
+    expect(presetWrapper?.classList.contains('col-md-6')).toBe(true);
+
+    const presetRow = root.querySelector('ng-select[name="ytdlOptionsPresets"]')?.closest('.row');
+    expect(presetRow?.querySelector('input[name="checkIntervalMinutes"]')).toBeNull();
+    expect(presetRow?.querySelector('input[name="ytdlOptionsOverrides"]')).not.toBeNull();
+  });
+
+  it('does not submit manual overrides when disabled', () => {
+    const fixture = TestBed.createComponent(App);
+    const app = fixture.componentInstance;
+
+    app.ytdlOptionsOverrides = '{"exec":"echo hi"}';
+
+    const payload = app['buildAddPayload']();
+
+    expect(payload.ytdlOptionsOverrides).toBe('');
+  });
 });

ui/src/app/app.ts

@@ -83,6 +83,9 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
   chapterTemplate: string;
   subtitleLanguage: string;
   subtitleMode: string;
+  ytdlOptionsPresets: string[] = [];
+  ytdlOptionsOverrides: string;
+  ytdlOptionPresetNames: string[] = [];
   addInProgress = false;
   cancelRequested = false;
   subscribeInProgress = false;
@@ -231,6 +234,8 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
     this.chapterTemplate = this.cookieService.get('metube_chapter_template') || '';
     this.subtitleLanguage = this.cookieService.get('metube_subtitle_language') || 'en';
     this.subtitleMode = this.cookieService.get('metube_subtitle_mode') || 'prefer_manual';
+    this.ytdlOptionsPresets = this.loadYtdlOptionsPresetsFromCookie();
+    this.ytdlOptionsOverrides = this.cookieService.get('metube_ytdl_options_overrides') || '';
     const allowedDownloadTypes = new Set(this.downloadTypes.map(t => t.id));
     const allowedVideoCodecs = new Set(this.videoCodecs.map(c => c.id));
     if (!allowedDownloadTypes.has(this.downloadType)) {
@@ -287,6 +292,7 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
     });
     this.getConfiguration();
     this.getYtdlOptionsUpdateTime();
+    this.getYtdlOptionPresets();
     this.customDirs$ = this.getMatchingCustomDir();
     this.setTheme(this.activeTheme!);
 
@@ -350,6 +356,10 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
     return this.downloads.configuration['CUSTOM_DIRS'];
   }
 
+  allowYtdlOptionsOverrides() {
+    return this.downloads.configuration['ALLOW_YTDL_OPTIONS_OVERRIDES'] === true;
+  }
+
   allowCustomDir(tag: string) {
     if (this.downloads.configuration['CREATE_CUSTOM_DIRS']) {
       return tag;
@@ -415,6 +425,62 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
     });
   }
 
+  getYtdlOptionPresets() {
+    this.downloads.getPresets().pipe(takeUntilDestroyed(this.destroyRef)).subscribe({
+      next: (data) => {
+        this.ytdlOptionPresetNames = Array.isArray(data?.presets)
+          ? data.presets.filter((preset): preset is string => typeof preset === 'string')
+          : [];
+        if (this.ytdlOptionsPresets?.length) {
+          const valid = new Set(this.ytdlOptionPresetNames);
+          const filtered = this.ytdlOptionsPresets.filter((p) => valid.has(p));
+          if (filtered.length !== this.ytdlOptionsPresets.length) {
+            this.ytdlOptionsPresets = filtered;
+            this.ytdlOptionsPresetsChanged();
+          }
+        }
+        this.cdr.markForCheck();
+      },
+    });
+  }
+
+  private loadYtdlOptionsPresetsFromCookie(): string[] {
+    const jsonCookie = this.cookieService.get('metube_ytdl_options_presets');
+    if (jsonCookie) {
+      try {
+        const parsed = JSON.parse(jsonCookie) as unknown;
+        if (Array.isArray(parsed)) {
+          return parsed.filter((p): p is string => typeof p === 'string' && p.length > 0);
+        }
+      } catch {
+        // fall through to legacy cookie
+      }
+    }
+    const legacy = this.cookieService.get('metube_ytdl_options_preset')?.trim();
+    return legacy ? [legacy] : [];
+  }
+
+  private validateYtdlOptionsOverrides(value: string): boolean {
+    if (!this.allowYtdlOptionsOverrides()) {
+      return true;
+    }
+    const trimmed = value?.trim() || '';
+    if (!trimmed) {
+      return true;
+    }
+    try {
+      const parsed = JSON.parse(trimmed);
+      if (!parsed || Array.isArray(parsed) || typeof parsed !== 'object') {
+        alert('Custom yt-dlp options must be a JSON object');
+        return false;
+      }
+    } catch {
+      alert('Custom yt-dlp options must be valid JSON');
+      return false;
+    }
+    return true;
+  }
+
   private rebuildCachedSubs() {
     this.cachedSubs = Array.from(this.subscriptionsSvc.subscriptions.entries());
     const validIds = new Set(this.cachedSubs.map(([id]) => id));
@@ -491,6 +557,9 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
       alert('Chapter template must include %(section_number)');
       return;
     }
+    if (!this.validateYtdlOptionsOverrides(payload.ytdlOptionsOverrides)) {
+      return;
+    }
     this.subscribeInProgress = true;
     this.subscriptionsSvc
       .subscribe({
@@ -695,6 +764,18 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
     this.saveSelection(this.downloadType);
   }
 
+  ytdlOptionsPresetsChanged() {
+    this.cookieService.set(
+      'metube_ytdl_options_presets',
+      JSON.stringify(this.ytdlOptionsPresets ?? []),
+      { expires: this.settingsCookieExpiryDays },
+    );
+  }
+
+  ytdlOptionsOverridesChanged() {
+    this.cookieService.set('metube_ytdl_options_overrides', this.ytdlOptionsOverrides, { expires: this.settingsCookieExpiryDays });
+  }
+
   isVideoType() {
     return this.downloadType === 'video';
   }
@@ -880,6 +961,7 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
   }
 
   private buildAddPayload(overrides: Partial<AddDownloadPayload> = {}): AddDownloadPayload {
+    const allowYtdlOptionsOverrides = this.allowYtdlOptionsOverrides();
     return {
       url: overrides.url ?? this.addUrl,
       downloadType: overrides.downloadType ?? this.downloadType,
@@ -894,6 +976,10 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
       chapterTemplate: overrides.chapterTemplate ?? this.chapterTemplate,
       subtitleLanguage: overrides.subtitleLanguage ?? this.subtitleLanguage,
       subtitleMode: overrides.subtitleMode ?? this.subtitleMode,
+      ytdlOptionsPresets: overrides.ytdlOptionsPresets ?? [...this.ytdlOptionsPresets],
+      ytdlOptionsOverrides: allowYtdlOptionsOverrides
+        ? (overrides.ytdlOptionsOverrides ?? this.ytdlOptionsOverrides)
+        : '',
     };
   }
 
@@ -905,6 +991,9 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
       alert('Chapter template must include %(section_number)');
       return;
     }
+    if (!this.validateYtdlOptionsOverrides(payload.ytdlOptionsOverrides)) {
+      return;
+    }
 
     console.debug('Downloading:', payload);
     this.addInProgress = true;
@@ -960,6 +1049,10 @@ export class App implements AfterViewInit, OnInit, OnDestroy {
       chapterTemplate: download.chapter_template,
       subtitleLanguage: download.subtitle_language,
       subtitleMode: download.subtitle_mode,
+      ytdlOptionsPresets: download.ytdl_options_presets?.length
+        ? [...download.ytdl_options_presets]
+        : [],
+      ytdlOptionsOverrides: download.ytdl_options_overrides ? JSON.stringify(download.ytdl_options_overrides) : '',
     });
     this.downloads.delById('done', [key]).subscribe();
   }

ui/src/app/interfaces/download.ts

@@ -14,6 +14,8 @@ export interface Download {
   chapter_template?: string;
   subtitle_language?: string;
   subtitle_mode?: string;
+  ytdl_options_presets?: string[];
+  ytdl_options_overrides?: Record<string, unknown>;
   status: string;
   msg: string;
   percent: number;

ui/src/app/services/downloads.service.spec.ts

@@ -39,6 +39,8 @@ function basePayload(): AddDownloadPayload {
     chapterTemplate: '',
     subtitleLanguage: 'en',
     subtitleMode: 'prefer_manual',
+    ytdlOptionsPresets: [],
+    ytdlOptionsOverrides: '',
   };
 }
 
@@ -79,11 +81,22 @@ describe('DownloadsService', () => {
         chapter_template: '',
         subtitle_language: 'en',
         subtitle_mode: 'prefer_manual',
+        ytdl_options_presets: [],
+        ytdl_options_overrides: '',
       }),
     );
     req.flush({ status: 'ok' });
   });
 
+  it('getPresets() fetches configured preset names', () => {
+    service.getPresets().subscribe((result) => {
+      expect(result).toEqual({ presets: ['Preset A'] });
+    });
+    const req = httpMock.expectOne('presets');
+    expect(req.request.method).toBe('GET');
+    req.flush({ presets: ['Preset A'] });
+  });
+
   it('cancelAdd posts to cancel-add', () => {
     service.cancelAdd().subscribe();
     const req = httpMock.expectOne('cancel-add');

ui/src/app/services/downloads.service.ts

@@ -20,6 +20,8 @@ export interface AddDownloadPayload {
   chapterTemplate: string;
   subtitleLanguage: string;
   subtitleMode: string;
+  ytdlOptionsPresets: string[];
+  ytdlOptionsOverrides: string;
 }
 @Injectable({
   providedIn: 'root'
@@ -141,11 +143,19 @@ export class DownloadsService {
       chapter_template: payload.chapterTemplate,
       subtitle_language: payload.subtitleLanguage,
       subtitle_mode: payload.subtitleMode,
+      ytdl_options_presets: payload.ytdlOptionsPresets,
+      ytdl_options_overrides: payload.ytdlOptionsOverrides,
     }).pipe(
       catchError(this.handleHTTPError)
     );
   }
 
+  public getPresets() {
+    return this.http.get<{ presets: string[] }>('presets').pipe(
+      catchError(() => of({ presets: [] }))
+    );
+  }
+
   public startById(ids: string[]) {
     return this.http.post('start', {ids: ids});
   }

ui/src/app/services/subscriptions.service.ts

@@ -94,6 +94,8 @@ export class SubscriptionsService {
         chapter_template: payload.chapterTemplate,
         subtitle_language: payload.subtitleLanguage,
         subtitle_mode: payload.subtitleMode,
+        ytdl_options_presets: payload.ytdlOptionsPresets,
+        ytdl_options_overrides: payload.ytdlOptionsOverrides,
         check_interval_minutes: payload.checkIntervalMinutes,
       })
       .pipe(catchError((err) => this.handleHTTPError(err)));

uv.lock

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 [[package]]
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+version = "3.4.7"
 source = { registry = "https://pypi.org/simple" }
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+sdist = { url = "https://files.pythonhosted.org/packages/e7/a1/67fe25fac3c7642725500a3f6cfe5821ad557c3abb11c9d20d12c7008d3e/charset_normalizer-3.4.7.tar.gz", hash = "sha256:ae89db9e5f98a11a4bf50407d4363e7b09b31e55bc117b4f7d80aab97ba009e5", size = 144271, upload-time = "2026-04-02T09:28:39.342Z" }
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