[Bug 791876] New: vaapipostproc bt709 support

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=791876

            Bug ID: 791876
           Summary: vaapipostproc bt709 support
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: florent.thiery at ubicast.eu
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

I am decoding with vaapidecodebin (autoplugged through decodebin), which scales
automagically. However i need bt709 support to avoid an additional conversion
between bt601 and bt709, or the following will crash:

$ gst-launch-1.0 videotestsrc num-buffers=1 ! x264enc ! h264parse !
vaapidecodebin ! "video/x-raw, format=(string)NV12, width=(int)960,
height=(int)540, framerate=(fraction)30, colorimetry=(string)bt709,
pixel-aspect-ratio=1/1" ! fakesink

Works:

$ gst-launch-1.0 videotestsrc num-buffers=1 ! x264enc ! h264parse !
vaapidecodebin ! videoconvert ! "video/x-raw, format=(string)NV12,
width=(int)960, height=(int)540, framerate=(fraction)30,
colorimetry=(string)bt709, pixel-aspect-ratio=1/1" ! fakesink

Is it possible to support bt709 ?

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