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fix(subtitles): improve secondary subtitle extraction and display (#215)

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sudacode
2026-08-23 01:56:49 -07:00
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commit 509dc5bf7f
20 changed files with 503 additions and 37 deletions
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docs/architecture/subtitle-overlay-priming.md
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@@ -97,11 +97,12 @@ coming and prefetching would otherwise idle for the rest of the cue.
## Secondary Subtitle Flow
- `secondary-sub-text` remains the immediate fallback, so unreadable and remote subtitle sources
still appear without waiting for file resolution.
- Parsed secondary text and the live fallback share a flattened-line identity for long lines. This
removes dialogue/sign repetitions that differ only in whitespace or terminal punctuation while
retaining short repeated lines that can represent authored dialogue without source metadata.
- `secondary-sub-text` remains the immediate fallback, so unreadable subtitle sources, remote URLs,
and files on network mounts still appear without waiting for file resolution. Embedded-track
extraction is skipped for those sources to avoid competing with playback for network bandwidth.
- Parsed secondary text and the live fallback remove exact repeated lines at any length. A
flattened-line identity also removes long dialogue/sign repetitions that differ only in
whitespace or terminal punctuation, while distinct simultaneous short lines remain separate.
- `secondary-subtitle-track.ts` resolves `secondary-sid` against mpv's track list. External tracks
are read directly; supported embedded text tracks are extracted through the same ffmpeg-backed
source resolver used by primary subtitle prefetching.