[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 #43 from cjunwang <cjun.wang at samsung.com> 2014-08-22 02:13:22 UTC ---
from scratch ccdec is designed to subtract cea608/708 data. but we can change
ccdec to userdatademux, to include subtracting other user_data packet
types(afd,etc). userdatademux should have seperated sometimes pads for
cea608,708, afd, ...
This need current mpegvideoparse userdata parsing modification moved to
userdatademux. and mpegvideoparse is only responsible to subtract userdata and
pass to userdatademux.
and it's possible to make userdatademux cover other video user data, such as
H.264/H.265.

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