[FFmpeg-devel] [PATCH/RFC] subtitles: introduce ASS codec id and use it.

Nicolas George nicolas.george at normalesup.org
Wed Feb 13 11:52:36 CET 2013

Le quartidi 14 nivôse, an CCXXI, Clement Boesch a écrit :
> In matroska, this markup is not stored as such: it has no "Dialogue:"
> prefix, it contains a ReadOrder field, the timing information is not in
> the payload, and it doesn't contain the trailing CRLF. See [1] for more
> info. We'll refer to this layout as "ASS".

There is another problem with that approach: ASS-in-Matroska only supports
Dialogue lines, while the ASS spec also defines "Comment", "Picture",
"Sound" and "Movie". mkvmerge ignores all these lines. Ignoring comments
seems ok, but IMHO the others should be preserved.

Possible solution: "clean ASS packets" could have the "Dialogue: " prefix,
optional for Dialogue because it is most common, but mandatory for the other

I will also ask to the Matroska maintainers.


  Nicolas George
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