[Bug 739196] video/x-xvid changed to video/mpeg,mpegversion=4

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=739196
  GStreamer | gst-plugins-base | 1.x

--- Comment #28 from Athanasios Oikonomou <athoik at gmail.com> 2014-11-10 21:05:17 UTC ---
I think mpeg4videoparse unpacks the packed bitstream already.

The only diffence is the packed bitstream indication in user data
(DivX503b1393p) and the dummy frames (N-VOP?).

Adding the following check in dvbmediasink:

/* remove dummy packed B-Frame */
if (self->codec_type == CT_MPEG4_PART2 && data_len <= 7)
   goto ok;

Seems that fixes the playback of xvid packed files passing the mpeg4 ioctl in
drivers (although currenlty only two users tested above fix).

So removing packed leftovers should make packed bitstreams fully unpacked.

PS. The xvid ioctl used in GStreamer 0.10 seem to work only for packed xvid and
thats why there was a special code in dvbmediasink to convert unpacked xvid
back to packed!

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