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

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=704881

--- Comment #74 from cjunwang <cjun.wang at samsung.com> ---
refined all patches as suggestions. 
test command like this:
gst-launch-1.0 filesrc location=clip3.ts ! tsdemux name=d d.video_0021 !
mpegvideoparse ! mpegvideodemux name=m m.video ! queue max-size-buffers=0
max-size-time=0 ! avdec_mpeg2video skip-frame=5 ! ceaccoverlay name=lay1 !
videoconvert ! videoscale ! video/x-raw, width=720 ! ximagesink sync=false
m.closedcaption ! queue max-size-buffers=0 max-size-time=0 ! lay1.

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