[Bug 766596] New: vaapipostproc: some video info is dropped on src caps.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=766596

            Bug ID: 766596
           Summary: vaapipostproc: some video info is dropped on src caps.
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: All
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: zzoon at igalia.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

While I'm looking into enabling passthrough (#751876) in vaapipostproc, I found
some src caps attrs are missing.

In my case,
sink caps : video/x-raw(memory:VASurface), format=(string)NV12, width=(int)854,
height=(int)480, interlace-mode=(string)progressive,
pixel-aspect-ratio=(fraction)1/1, chroma-site=(string)jpeg,
colorimetry=(string)bt601, framerate=(fraction)25/1

src caps : video/x-raw(memory:VASurface), format=(string)NV12, width=(int)854,
height=(int)480, framerate=(fraction)25/1, interlace-mode=(string)progressive,
pixel-aspect-ratio=(fraction)1/1

You can see chroma-site and colorimetry is missing in src caps.

This is caused by this patch
https://cgit.freedesktop.org/gstreamer/gstreamer-vaapi/commit/?id=4d1b11ed03759ef702c675cbacdb5ea543daa305

IMHO, this should be fixed to enable passthrough in vaapipostproc.

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