[Bug 773863] decklinkvideosrc: add VANC parsing

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=773863

--- Comment #9 from John Poet <jppoet at gmail.com> ---

After applying the three patches, the 'master' version of gstreamer can be run
like:

export GST_DEBUG=*:WARN,decklinkvideosrc:DEBUG
export DEVICE=2
gst-launch-1.0 decklinkvideosrc device-number=${DEVICE} mode=12 video-format=2
enable-vanc=1 ! queue ! autovideoconvert ! deinterlace mode=2 ! queue !
avenc_mpeg2video bitrate=800000 ! mpegvideoparse ! mpegtsmux name=mux !
filesink location=video.ts decklinkaudiosrc device-number=${DEVICE} !
audioconvert ! avenc_ac3 bitrate=640000 ! ac3parse ! queue ! mux.

When you run it like that, you will see that the VANC metadata that libav sees
is quite different from when was added by decklinkvideosrc.

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