[Bug 766201] New: Typefind inside decodebin is confused by the presence of audio in an mp4 container (Android playback)

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=766201

            Bug ID: 766201
           Summary: Typefind inside decodebin is confused by the presence
                    of audio in an mp4 container (Android playback)
    Classification: Platform
           Product: GStreamer
           Version: 1.7.91
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: gregoire at gentil.com
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Summary: The presence of audio in an mp4 audio/video file confused typefind and
decodebin to the point that the pipeline can't find the video decoder plugin.

I have two videos generated by gstreamer-0.10 on an embedded device. The same
video encoder is used in both cases:

[1] video/videov.mp4 has only a h264 track. mp4info video/videov.mp4 reports:

videov.mp4:
Track    Type    Info
1    video    H264 Baseline at 4, 7.716 secs, 16614 kbps, 1280x1440 @ 50.155521
fps


[2] videoaudio/videov.mp4 has a h264 track and a mp3 track. mp4info
videoaudio/videov.mp4 reports:

videov.mp4:
Track    Type    Info
1    video    H264 Baseline at 4, 7.199 secs, 16614 kbps, 1280x1440 @ 50.145854
fps
2    audio    MPEG-1 Audio (11172-3), 7.176 secs, 48 kbps, 24000 Hz


The two files are provided here: http://gentil.com/tmp/samples.zip


I play both files on a PixelC Android 6.x tablet with gstreamer 1.7.91. Note
that I have the same issue on Nexus 5x. The two pipeplines are:

[1] video/videov.mp4

filesrc location=/storage/emulated/0/aiTennis3D/video/videov.mp4 ! qtdemux
name=q q.video_0 ! queue ! decodebin name=forhwgl ! queue ! identity
name=forhalffps ! glimagesink force-aspect-ratio=false


[2] videoaudio/videov.mp4 

filesrc location=/storage/emulated/0/aiTennis3D/videoaudio/videov.mp4 ! qtdemux
name=q q.video_0 ! queue ! decodebin name=forhwgl ! queue ! identity
name=forhalffps ! glimagesink force-aspect-ratio=false q.audio_0 ! queue !
decodebin ! queue ! autoaudiosink


When playing the video only file, there is no problem. log log-video.zip is
attached.

When playing the video/audio file, gstreamer can't find the video decoder
plugin. The log log-videoaudio.zip is attached.

A few additional notes:
- amcviddec-omxnvidiah264decode doesn't seem to be instantiated in the second
case.

- The problem is the same with a simple playbin pipeline.

- If I replace decodebin by "h264parse ! amcviddec-omxnvidiah264decode", it's
working.

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