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fix(subtitles): suppress ASS font texture artifacts

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- Filter clipped glyph runs and alpha-texture effects from parsed ASS cues
- Add regression coverage for repeated-glyph and per-character texture signs
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sudacode
2026-08-24 01:33:59 -07:00
parent 60432ca2f3
commit b029cc73a1
3 changed files with 101 additions and 2 deletions
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changes/fix-secondary-subtitle-duplication.md
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type: fixed
area: overlay
- Secondary subtitles now parse the selected ASS/SRT/VTT source with the primary subtitle deduplication pipeline, preventing layered animation text from appearing several times in the overlay, mined cards, and statistics. Fragmented ASS karaoke keeps spaces authored at event boundaries and recovers Latin word spaces encoded only by positioned fragment gaps, including word gaps measured across wide glyphs that width normalization alone reads as ordinary letter advances. Progressive karaoke highlights, offset shadow copies, and overlapping decorative glyphs remain suppressed. Long ASS lines repeated as dialogue and positioned signs are also collapsed when they differ only in whitespace or terminal punctuation. Dense multi-row sign layouts no longer become concatenated primary or secondary lines. Live mpv text remains the fallback for unreadable tracks and applies full-line duplicate filtering before display. A failed source refresh also clears ASS-only cleanup so fallback text from other formats stays intact.
- Secondary subtitles now parse the selected ASS/SRT/VTT source with the primary subtitle deduplication pipeline, preventing layered animation text from appearing several times in the overlay, mined cards, and statistics. Fragmented ASS karaoke keeps spaces authored at event boundaries and recovers Latin word spaces encoded only by positioned fragment gaps, including word gaps measured across wide glyphs that width normalization alone reads as ordinary letter advances. Progressive karaoke highlights, offset shadow copies, overlapping decorative glyphs, and font-based sign textures remain suppressed. Long ASS lines repeated as dialogue and positioned signs are also collapsed when they differ only in whitespace or terminal punctuation. Dense multi-row sign layouts no longer become concatenated primary or secondary lines. Live mpv text remains the fallback for unreadable tracks and applies full-line duplicate filtering before display. A failed source refresh also clears ASS-only cleanup so fallback text from other formats stays intact.