[FFmpeg-cvslog] Merge remote-tracking branch 'cus/stable'

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Sat Nov 30 05:07:15 2013 +0100| [bd9de4f5942a9e073f37df7a64ed1baff2d24419] | committer: Michael Niedermayer

Merge remote-tracking branch 'cus/stable'

* cus/stable:
  ffmpeg: ensure that -fix_sub_duration doesnt create subtitles with zero duration
  ffmpeg: free empty subtitles as well in transcode_subtitles
  ffmpeg: do not pass possibly undefined subtitles to sub2video_update

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=bd9de4f5942a9e073f37df7a64ed1baff2d24419
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