[Bug 792435] New: v4l2src selecting suboptimal colorspace

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=792435

            Bug ID: 792435
           Summary: v4l2src selecting suboptimal colorspace
    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: florent.thiery at ubicast.eu
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 366676
  --> https://bugzilla.gnome.org/attachment.cgi?id=366676&action=edit
debug output

I was expecting the following pipeline to negociate NV12 directly from the
device (whose driver supports NV12), but for an unknown reason v4l2 selects
YVYU:

$ GST_DEBUG=v4l2*:5 gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=1 !
queue name=qinput1 ! videoconvert ! videoscale ! "video/x-raw,
format=(string)NV12, width=(int)1920, height=(int)1080, framerate=(fraction)30,
colorimetry=(string)bt709, pixel-aspect-ratio=1/1" ! fakesink

This will imply an unnecessary colorspace conversion by videoconvert.

Manually requesting NV12 does work though:
$ GST_DEBUG=v4l2*:5 gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=1 !
queue name=qinput1 ! "video/x-raw, format=(string)NV12, width=(int)1920,
height=(int)1080, framerate=(fraction)30, colorimetry=(string)bt709,
pixel-aspect-ratio=1/1" ! fakesink -v

Why is v4l2src not choosing NV12 in the first place ?

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