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

[Michael Niedermayer]

ffmpeg | branch: master | Michael Niedermayer <michaelni at gmx.at> | Sat Apr  5 03:23:43 2014 +0200| [7a5537fd3fd06f71c077ef06467149390ed491ea] | committer: Michael Niedermayer

Merge remote-tracking branch 'cehoyos/master'

* cehoyos/master:
  Allow .y as extension for image2.
  Show stream number when warning about stream without start time.
  Force gif aspect ratio multiplication to 64bit.

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

> http://git.videolan.org/gitweb.cgi/ffmpeg.git/?a=commit;h=7a5537fd3fd06f71c077ef06467149390ed491ea
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