[Bug 725248] New: videobox fails to negotiate in an environment with possible RGB input.

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=725248
  GStreamer | gst-plugins-good | git

           Summary: videobox fails to negotiate in an environment with
                    possible RGB input.
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: swestrup at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


I have an element that only outputs a small range of RGB formats. I want to
videoconvert to a YUV format, clip the results and output the final video to an
xvimagesink.

However, I find that in this scenario, videobox fails to negotiate a format it
can work with, and ends up rejecting all caps, causing the pipeline to fail.
Here is the smallest reproduction of the error I've been able to create:

gst-launch-1.0 videotestsrc  ! "video/x-raw,format={BGRx,BGRA,RGB,RGB16,RGB15}"
! videoconvert ! videobox ! xvimagesink display=:0

I have this issue both with the 1.2 version of GStreamer I'm developing on, and
the latest 1.3.x version in git.

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