[Bug 749634] New: Strange behaviour in compositor element

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=749634

            Bug ID: 749634
           Summary: Strange behaviour in compositor element
    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: d.fernandezlop at gmail.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 303666
  --> https://bugzilla.gnome.org/attachment.cgi?id=303666&action=edit
Previous image

Hi,

Since this patch
http://cgit.freedesktop.org/gstreamer/gst-plugins-bad/commit/?id=0871b7b43db796b50f432e4c892cca65c633b5ff
the behaviour of compositor is strange.

I use this pipeline to test:

gst-launch-1.5 compositor name=mix ! videoconvert ! xvimagesink \
   videotestsrc pattern=8 !
video/x-raw,format=AYUV,framerate=5/1,width=320,height=180 ! videobox
border-alpha=0 top=0 left=0 ! mix. \
   videotestsrc pattern=21 !
video/x-raw,format=AYUV,framerate=5/1,width=320,height=180 ! videobox
border-alpha=0 top=0 left=-320 ! mix. \
   videotestsrc pattern=18 !
video/x-raw,format=AYUV,framerate=5/1,width=320,height=180 ! videobox
border-alpha=0 top=-180 left=0 ! mix. \
   videotestsrc pattern=0 !
video/x-raw,format=AYUV,framerate=5/1,width=320,height=180 ! videobox
border-alpha=0 top=-180 left=-320 ! mix.

The output of the pipeline before the patch (I understand that is the correct
output) is shown in the attached picture (previous.png). And the output after
the patch can be seen in the other picture (after.png). The second one has a
different height and width, and the position of the third stream is wrong.

It is a bug or it is a expected behaviour?

Regards.
David.

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