8000 Animation subprocess bug by tonysyu · Pull Request #989 · matplotlib/matplotlib · GitHub
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Animation subprocess bug #989

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Merged
merged 2 commits into from
Jul 20, 2012
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Animation subprocess bug #989

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66b14f1
Fix subprocess bug when saving animations.
tonysyu Jul 7, 2012
467fa90
Add print-out of ffmpeg output when debugging.
tonysyu Jul 7, 2012
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Fix subprocess bug when saving animations. 
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 (no error). Suppress logging in ffmpeg to prevent this issue.
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@tonysyu
tonysyu committed Jul 7, 2012
commit 66b14f189413309fa468882f72f420d52c8f1026
8 changes: 5 additions & 3 deletions lib/matplotlib/animation.py
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Expand Up @@ -356,10 +356,12 @@ def output_args(self):
class FFMpegWriter(MovieWriter, FFMpegBase):
def _args(self):
# Returns the command line parameters for subprocess to use
# ffmpeg to create a movie using a pipe
# ffmpeg to create a movie using a pipe.
# Logging is quieted because subprocess.PIPE has limited buffer size.
return [self.bin_path(), '-f', 'rawvideo', '-vcodec', 'rawvideo',
'-s', '%dx%d' % self.frame_size, '-pix_fmt', self.frame_format,
'-r', str(self.fps), '-i', 'pipe:'] + self.output_args
'-s', '%dx%d' % self.frame_size, '-pix_fmt', self.frame_format,
'-r', str(self.fps), '-loglevel', 'quiet',
'-i', 'pipe:'] + self.output_args


#Combine FFMpeg options with temp file-based writing
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