[Bug 754291] New: Compositor fails with "reason not-negotiated" when changing the pixel-aspect-ratio during runtime

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=754291

            Bug ID: 754291
           Summary: Compositor fails with "reason not-negotiated" when
                    changing the pixel-aspect-ratio during runtime
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: peter at mazdermind.de
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 310267
  --> https://bugzilla.gnome.org/attachment.cgi?id=310267&action=edit
example program

The test-program attached to this bug contains a pipeline like this:

`
videotestsrc pattern=red !
video/x-raw,width=1920,height=1080,format=I420,framerate=25/1,pixel-aspect-ratio=1/1
!
videoscale !
capsfilter name=caps0 caps=video/x-raw !
mix.

compositor name=mix !
video/x-raw,width=1920,height=1080,format=I420,framerate=25/1,pixel-aspect-ratio=1/1
!
xvimagesink
`

The caps property of the capsfilter caps0 is, 1 second after the pipeline
starts, set to `video/x-raw,width=950,height=534`

Because the requested resolution 950:534 is not exactly 16:9 as the input, the
videoscaler will produce videoframes with a PAR of 1424/1425

`
video/x-raw, format=(string)I420, width=(int)950, height=(int)534,
framerate=(fraction)25/1, pixel-aspect-ratio=(fraction)1424/1425,
interlace-mode=(string)progressive
`
The compositor doesn't allow this change and terminates the pipeline.

Using videomixer instead of compositor does not show this behavior and forcing
a pixel-aspect-ratio of 1/1 between the videoscaler and the compositor also
fixes the issue.

What worries me is that this behavior was not visible in 1.5.1

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