[Bug 704881] Partial ATSC_user_data and CEA-708 Closed Captions Support

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=704881
  GStreamer | gst-plugins-bad | git

--- Comment #55 from Sebastian Dröge (slomo) <slomo at coaxion.net> 2014-09-13 09:28:25 UTC ---
The cleanest way after some more discussion on IRC seems to be:

- Add a h264demux that splits off the CC stream(s) and forwards the normal h264
bitstream, additional to a h264parse which would come after it (h264demux has a
higher rank). h264demux would also use the codecparsers lib, so will be
relatively small. Reason for a separate element: our parser handling is
difficult enough already and the concept was always that a parser has one
always sinkpad and one always srcpad. This thing here is conceptionally exactly
what we call demuxer elsewhere.
- Add support for dynamic pads that are added later (after no-more-pads) to
decodebin/uridecodebin/playbin. Without having them handled as a new group, and
without breaking group handling.

The second part is not really trivial :)

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