[Bug 699398] New: mpegvideoparse: couple of issues

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=699398
  GStreamer | gst-plugins-bad | git

           Summary: mpegvideoparse: couple of issues
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: All
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: matej.knopp at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


When encountering new sequence header, the parser compares its size to previous
one and when it differs it updates codec data and sends caps again. This is not
necessary. Unless the actual header changes (first 11 bytes) the quantization
matrices in codec data should not be updated, otherwise it causes unnecessary
decoder reopen. 

Second issue is that when starting the parsing in the middle of GOP, the parser
outputs frames before it has chance to parse the sequence header. This results
in completely wrong caps (i.e. mpegversion=1 for mpeg 2).

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