matplotlib/matplotlib — pull request #989 by tonysyu (2012-07-07 18:50:53+00:00)
Title: Animation subprocess bug

Ffmpeg prints a lot of info to stderr. For longer animations, this logging fills up the (very-small) buffer for subprocess.PIPE and subprocess just hangs (with no error).

This PR suppresses logging in ffmpeg to prevent this issue. If matplotlib's verbosity level is set to 'debug*', then ffmpeg's output is piped to stdout.