[Bug 755937] New: v4l2object: probe colorspace supported by device

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755937

            Bug ID: 755937
           Summary: v4l2object: probe colorspace supported by device
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: aurelien.zanelli at parrot.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Currently we only add in caps the default colorimetry info given by the device
for a specific video dimension and pixelformat. However a device can support
more than one colorspace and so we could end up with a negotiation failure if
the colorimetry doesn't match even if the v4l2 device can support the video
colorspace.

This issue has been introduce 7a1613b9e15ab3e437c56b4de7bc15a30ea4f619.

I discovered this issue when trying to play 'Sintel' on my platform. The
h264parser set the colorimetry in caps to bt601, but my v4l2sink default
colorimetry was bt709, thus leading to a negotiation error.

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