MediaBrowser/MediaBrowser — pull request #691 by abeloin (2014-01-25 21:09:30+00:00)
Title: Don't re-encode subtitle: ass/ssa -> ass.

This fix Issue #630 : "ASS encoder supports only one ASS rectangle field".

See https://lists.ffmpeg.org/pipermail/ffmpeg-cvslog/2013-April/063616.html for more info on the ass rectangle limitation.