[Bug 779807] New: Both videomixer and glvideomixer do not want to work properly with avdec_h264 decoder

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=779807

            Bug ID: 779807
           Summary: Both videomixer and glvideomixer do not want to work
                    properly with avdec_h264 decoder
    Classification: Platform
           Product: GStreamer
           Version: 1.10.x
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-libav
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: ciceromarcus at yandex.ru
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Hello. I want to build a graph which would mix pictures from a few h264 streams
into one frame (so called ``picture in picture''). It seems that videomixer
element is the right thing to do the trick. And videomixer works as expected
with videotestsrc [graph_0.sh]. However, when I build graph with h264 decoder
[graph_2.sh], it fails with an error: 

>ERROR: from element /GstPipeline:pipeline0/MpegTSParse2:mpegtsparse2-0: Internal data stream error.
>Additional debug info:
>mpegtsbase.c(1613): mpegts_base_loop (): /GstPipeline:pipeline0/MpegTSParse2:mpegtsparse2-0:
>streaming stopped, reason not-negotiated (-4)

But when I switch videomixer with glvideomixer [graph_3.sh] it works fine.
However, if I add background via videotestsrc, it also fails [graph_3b.sh].

Graph with decodebin and glvideomixer also works [graph_4.sh], but graph with
decodebin, glvideomixer and videotestsrc background [graph_4b.sh] -- does not.

But I've noticed that [graph_4b.sh] works perfectly with mpeg2 decoded ts,
while failing with h264 stream.

I could not understand what's the problem, but it seems that the problem is
avdec_h264 related, so I need some help. I'm not sure is it a bug or am i doing
something wrong.

I've attached graph scripts and 2 test streams (mpeg2 and h264).

Thank you.

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