jiaaro/pydub — pull request #14 by hunterlang (2013-06-24 04:38:17+00:00)
Title: fix bitrate option

In ffmpeg, -b defaults to -b:v, which only deals with video bitrate. Explicitly using -b:a will handle audio bitrate changes and give the desired behavior.

http://ffmpeg.org/ffmpeg.html#Stream-specifiers-1