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feat(subtitle): read scc closed captions and convert them before muxing

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SCC goes straight to --sub-format when it is SRT, WebVTT or TTML, else to SRT; pycaption reads the CC1 channel, and an SCC with no CC1 captions warns. Raise the pycaption floor to 2.2.24 for its SCC reader fixes.
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imSp4rky
2026-11-13 14:09:16 -07:00
parent 7f91a1d36b
commit 94dfb5d677
8 changed files with 118 additions and 10 deletions
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docs/dev/service-architecture.md
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@@ -301,7 +301,7 @@ and `descriptive`. `Audio.Codec` covers `AAC`, `AC3` (`DD`), `EC3` (`DD+`), `AC4
(subtitles for the deaf and hard-of-hearing), and `forced`. A track cannot be both `cc`
and `sdh`, and `forced` cannot combine with either. `Subtitle.Codec` includes `SubRip`
(SRT), `WebVTT` (VTT), `SubStationAlpha`/`SubStationAlphav4` (SSA/ASS),
`TimedTextMarkupLang` (TTML), `SAMI`, and the box-encapsulated DASH formats `fTTML`
`TimedTextMarkupLang` (TTML), `SAMI`, `SCC`, and the box-encapsulated DASH formats `fTTML`
(STPP) and `fVTT` (WVTT). Subtitles receive post-download normalization
(segment merging, WebVTT sanitization, format conversion, and optional SDH stripping),
all documented for users in [Subtitles](../guide/subtitles.md).