[gstreamer-bugs] [Bug 578926] New: decodebin/decodebin2 should insert mpeg4videoparse

GStreamer (bugzilla.gnome.org) bugzilla-daemon at bugzilla.gnome.org
Tue Apr 14 05:45:10 PDT 2009

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  GStreamer | gst-plugins-base | Ver: 0.10.21
           Summary: decodebin/decodebin2 should insert mpeg4videoparse
           Product: GStreamer
           Version: 0.10.21
          Platform: Other
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-base
        AssignedTo: gstreamer-bugs at lists.sourceforge.net
        ReportedBy: arnout at mind.be
         QAContact: gstreamer-bugs at lists.sourceforge.net
     GNOME version: Unspecified
   GNOME milestone: Unspecified

When I view an MPEG4 stream from a Sony camera with playbin or playbin2 (or
decodebin or decodebin2), the decoded stream is weird.  It looks like only the
top row or so of macroblocks is really decoded, and the rest only has
differential info (probably the I-frames aren't detected).  I get the same
effect with a manually constructed pipeline:

 souphttpsrc location=... ! ffdec_mpeg4 ! autovideosink

Inserting an mpeg4videoparse solves this:

 souphttpsrc location=... ! mpeg4videoparse ! ffdec_mpeg4 ! autovideosink

This is using -base 0.10.21, -bad 0.10.9 and -ffmpeg 0.10.4.

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