[Bug 674238] New: [mpegvideoparse] Seeks to I frames instead of the sequence header right before the I frame

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=674238
  GStreamer | gst-plugins-bad | 0.11.x

           Summary: [mpegvideoparse] Seeks to I frames instead of the
                    sequence header right before the I frame
    Classification: Platform
           Product: GStreamer
           Version: 0.11.x
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: Normal
         Component: gst-plugins-bad
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: slomo at circular-chaos.org
         QAContact: gstreamer-bugs at lists.freedesktop.org
                CC: nicolas.dufresne at collabora.co.uk
     GNOME version: ---


Currently mpegvideoparse seeks to I frames instead of the sequence header right
before the I frame, which usually comes directly before the I frame. As the
sequence header could change for every I frame, the parser should use this as
key units.

The current behaviour requires caching of the sequence header inside decoders
and assuming that it didn't change. As a result, when this caching does not
happen, accurate seeking is impossible because the decoder has to skip over
until the next sequence header in front of the next I frame.

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