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fix(subtitles): suppress per-glyph typesetting walls in live subtitle text

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When embedded-track extraction is skipped (network-mounted media), live mpv
text during per-glyph typeset karaoke is a wall of simultaneous one-glyph
lines plus the syllable being typed. No parsed cues exist to substitute, so
the wall reached both overlays and recording verbatim. Detect bursts of many
single-glyph lines in the live fallback paths and drop them with their short
syllable companions, keeping concurrent dialogue lines.
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sudacode
2026-08-23 20:33:13 -07:00
parent 9f08adbfb9
commit 1717d2d3f2
8 changed files with 110 additions and 8 deletions
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docs/architecture/subtitle-overlay-priming.md
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@@ -100,6 +100,11 @@ coming and prefetching would otherwise idle for the rest of the cue.
- `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.
- The live fallback also suppresses per-glyph typesetting walls: when many simultaneous
one-glyph lines are present (generated karaoke lettering flattened into live text), those
lines and their short syllable companions are dropped while concurrent dialogue lines stay.
This covers network-mounted media, where embedded-track extraction is skipped and no parsed
cues exist to substitute.
- 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.