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

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Sat May  4 16:58:41 2013 +0200| [30db867cb7be54fd8e756640b4e18cb20a70a64a] | committer: Michael Niedermayer

Merge remote-tracking branch 'cigaes/master'

* cigaes/master:
  lavf/matroskaenc: return an error for unsupported types.
  lavf/concatdec: remove invalid check for AVSEEK_FLAG_BACKWARD.
  lavf: filter out AVSEEK_FLAG_BACKWARD in new API.
  lavf: call the new seek API from the old.

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=30db867cb7be54fd8e756640b4e18cb20a70a64a
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