[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 #50 from cjunwang <cjun.wang at samsung.com> 2014-08-30 06:53:09 UTC ---
Yes. it works.
in product there could be this kind of cea708overlay with
GstVideoOverlayCompositionMeta. but in zero-copy solution decoded video buffer
is dmabuf, used to directly render, seldom used for overlay. this works but
seems a bit unsuitable to connect to overlay plugin. if the purpose is only to
know the video properties, mpegvideoparse already know them by parsing sequence
header. we can send them downstream, or set as part of capbility, to let
downstream cc plugin know.

for open source, maybe in first step we just need implement cea708overlay
element without GstVideoOverlayCompositionMeta. in future consider more
complicated senario.

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