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@@ -2537,7 +2537,9 @@ shown in track listings. The <strong>Extension</strong> column is the file exten
<p><code>fTTML</code> (STPP) and <code>fVTT</code> (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 (<code>fTTML</code> becomes TTML and <code>fVTT</code> 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 <code>presentationTimeOffset</code> 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 <em>from</em> these boxed formats, but no
backend can write them as an output target, so they can never be a conversion
destination.</p>