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fix(subtitle): remove the DASH presentationTimeOffset from stpp and wvtt cues

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STPP and WVTT cues sit on the media timeline, so they played late by the offset after the mux.
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imSp4rky
2026-10-30 23:22:47 -06:00
parent 97711e799c
commit 0c45195fe2
4 changed files with 126 additions and 13 deletions
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docs/guide/subtitles.md
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@@ -35,7 +35,9 @@ shown in track listings. The **Extension** column is the file extension used on
`fTTML` (STPP) and `fVTT` (WVTT) are the fragmented, MP4-box-encapsulated forms that
DASH and HLS deliver. You never keep these as-is: right after download they are
unwrapped into their plain counterparts (`fTTML` becomes TTML and `fVTT` becomes
WebVTT), so you always end up with an editable text subtitle. Note that this is a
WebVTT), so you always end up with an editable text subtitle. For a DASH track, the
unwrap also subtracts the manifest's `presentationTimeOffset` from the cue times, so the
subtitles stay in sync with the video. Note that this is a
one-way, source-only relationship: you can convert *from* these boxed formats, but no
backend can write them as an output target, so they can never be a conversion
destination.