[FFmpeg-cvslog] Merge remote-tracking branch 'qatar/master'

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Sat Aug 17 10:36:19 2013 +0200| [7a342f97c48f529d93aa46e572944d279c1dd697] | committer: Michael Niedermayer

Merge remote-tracking branch 'qatar/master'

* qatar/master:
  dxa: Make sure the reference frame exists

See: 12eb2fd5394813a6119912b22f5dfc17b4a6b4a0
Merged-by: Michael Niedermayer <michaelni at gmx.at>

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7a342f97c48f529d93aa46e572944d279c1dd697
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