[Bug 648933] New: [mpegvideoparse] Avoid searching for picture start codes when not needed

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=648933
  GStreamer | gst-plugins-bad | git

           Summary: [mpegvideoparse] Avoid searching for picture start
                    codes when not needed
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: NEW
          Severity: enhancement
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: bilboed at gmail.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


When parsing the picture header data, mpegvideoparse_handle_picture() scans for
all picture start codes.

This is not needed, it can stop scanning when it properly parses the first
picture header. And mpegpacketizer will make sure one block will only contain
one picture header.

Makes mpegvideoparse two times faster on HD content.

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