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feat(youtube): queue media for background cache and fill fields when rea

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- Add `youtube.mediaCache.maxHeight` config option (default 720p)
- Background mode creates text-only cards while cache downloads, queues media updates, fills audio/image fields once cached file is ready
- Announce cache download start and readiness via overlay/OSD notifications
- Skip mpv stream indexes when generating audio from a YouTube cached file
This commit is contained in:
Kyle Yasuda
2026-06-23 20:45:28 -07:00
parent 236f22662c
commit 028636c76d
38 changed files with 2047 additions and 67 deletions
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docs-site/configuration.md
+8 -6
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@@ -1522,18 +1522,20 @@ Set defaults used by managed subtitle auto-selection and the `subminer` launcher
"youtube": {
"primarySubLanguages": ["ja", "jpn"],
"mediaCache": {
"mode": "direct"
"mode": "direct",
"maxHeight": 720
}
}
}
```
| Option | Values | Description |
| --------------------- | ------------------------ | ------------------------------------------------------------------------------------------------ |
| `primarySubLanguages` | string[] | Primary subtitle language priority for managed subtitle auto-selection (default `["ja", "jpn"]`) |
| `mediaCache.mode` | `direct` \| `background` | YouTube card audio/image extraction mode (default `direct`) |
| Option | Values | Description |
| ---------------------- | ------------------------ | ------------------------------------------------------------------------------------------------ |
| `primarySubLanguages` | string[] | Primary subtitle language priority for managed subtitle auto-selection (default `["ja", "jpn"]`) |
| `mediaCache.mode` | `direct` \| `background` | YouTube card audio/image extraction mode (default `direct`) |
| `mediaCache.maxHeight` | number | Maximum background cache download height. Set `0` for unlimited (default `720`) |
`mediaCache.mode: "direct"` extracts card media from the active YouTube stream URL. `mediaCache.mode: "background"` starts a separate yt-dlp media download after YouTube playback has loaded. Playback and subtitle loading do not wait for that download; card media generation uses the cached file once it is ready and otherwise falls back to direct stream extraction.
`mediaCache.mode: "direct"` extracts card media from the active YouTube stream URL. `mediaCache.mode: "background"` starts a separate yt-dlp media download after YouTube playback has loaded. Playback and subtitle loading do not wait for that download. Background cache downloads are capped by `mediaCache.maxHeight`, which defaults to 720p; set it to `0` to let yt-dlp choose the best available height. SubMiner announces when the background cache download starts and when the cache is ready, using the configured notification surface; overlay and OSD messages queue until the overlay or mpv is ready. If you mine cards before the cache is ready, SubMiner creates the text fields immediately, queues the audio/image work for those note IDs, shows a status notification, and fills the media fields once the cached file is ready.
Current launcher behavior: