[Bug 750398] New: avenc_mjpeg fails to negotiate the source format

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=750398

            Bug ID: 750398
           Summary: avenc_mjpeg fails to negotiate the source format
    Classification: Platform
           Product: GStreamer
           Version: 1.4.5
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-libav
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: fgouget at codeweavers.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

To reproduce this, simply run the following command:

$ GST_DEBUG=1 gst-launch-1.0 videotestsrc num-buffers=40 ! videoconvert !
avenc_mjpeg ! fakesink
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
0:00:00.013323325 30166      0x18b1230 ERROR                  libav :0::
Specified pix_fmt is not supported
ERROR: from element /GstPipeline:pipeline0/avenc_mjpeg:avenc_mjpeg0: GStreamer
error: negotiation problem.
Additional debug info:
gstvideoencoder.c(1463): gst_video_encoder_chain ():
/GstPipeline:pipeline0/avenc_mjpeg:avenc_mjpeg0:
encoder not initialized
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...

This worked fine in 1.0.6 but is broken in 1.2.4 and 1.4.5. It seems to be
related to the 'format: { I420, Y42B }' restriction on the sink pad.

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