[FFmpeg-devel] [PATCH] Matroska demuxer adds WebVTT support

Matthew Heaney matthewjheaney at google.com
Sun Aug 18 00:38:32 CEST 2013

On Sat, Aug 10, 2013 at 11:09 AM, Clément Bœsch <ubitux at gmail.com> wrote:

> So you want the guy proposing a relatively trivial demuxing of WebVTT in
> WebM to wait (or implement) AVSubtitle2 and deal with all your concerns
> about the current state?

As a compromise, can we commit the patch we have now, and then later, make
a separate decision about whether to move webvtt frame parsing elsewhere?

The reason I ask is because the Chrome team (that would be me) needs the
ffmpeg demuxer to support parsing of text tracks that appear in WebM files.
 For now, storing the cue id and cue settings in the side data works fine
for us.  (Storing it somewhere else would work for us too!)  But without
this patch, then the ffmpeg demuxer doesn't support text tracks at all.

If the ffmpeg development team decides to change things up later, that's
fine -- I'll fix up Chrome to accommodate the later changes.  (I'll even
volunteer to make the ffmpeg changes.)  But we just need some modicum of
support now in the ffmpeg demuxer for handle inband text tracks, so we are
able to commit the associated changes to the media pipeline in Chrome.


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