[Bug 775204] New: validate: transcode failure with vaapi: gst buffer arrives before caps event in queue.

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=775204

            Bug ID: 775204
           Summary: validate: transcode failure with vaapi: gst buffer
                    arrives before caps event in queue.
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gstreamer-vaapi
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: zzoon at igalia.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
                CC: bsreerenj at gmail.com, vjaquez at igalia.com
     GNOME version: ---

Failures:
validate.file.transcode.to_rawaudio_and_prores_in_quicktime.mp3_h264_0_mp4
validate.file.transcode.to_vorbis_and_theora_in_ogg.mp3_h264_1_mp4
and 3-4 more testcases like this.

Investigation so far:
Queue(the fisrt queue in encodebin, before streamsplitter) get gstbuffer, then
caps event arrives.
It tries to push buffer first, and fails due to not-negotiated.

I don't know why gst buffer arrives at the queue even before negotiation is
done in encodebin and caps event arrives.

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