[Bug 707032] qtdemux: add support for webvtt subtitles

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=707032
  GStreamer | gst-plugins-good | unspecified

--- Comment #7 from Andoni Morales <ylatuya at gmail.com> 2013-08-29 16:14:56 UTC ---
In a first instance I though it would be packaged raw, one sample per cue point
as it's done for HLS, but it seems to be packed in a different way for MP4.
I have found here a proposal for the standard for WebVTT:
http://biblio.telecom-paristech.fr/cgi-bin/download.cgi?id=13809

If the output of the demuxer should be parsable by a webvtt parser, I don't get
why it needs to be packed/depacked in at the muxer/demuxer level.

A sample file can be found here:
http://download.tsi.telecom-paristech.fr/gpac/webvtt/counter-vtt.mp4

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