Hi,
while trying out animation.ArtistAnimation, my script would not
terminate. The .mp4 file was generated and later found out that the
script would block at proc.wait() within _make_movie. ffmpeg
generates quite a bit of text and it seems that if stdout/stderr are
not closed, wait() does not return (this is on Windows). I have made
some modifications to animation.py to get it to work, but can't tell
how this will behave on other platforms.
Proposed change in matplotlib/animation.py:
def _make_movie(self, fname, fps, codec, frame_prefix, cmd_gen=None):
# Uses subprocess to call the program for assembling frames into a
# movie file. *cmd_gen* is a callable that generates the sequence
# of command line arguments from a few configuration options.
from subprocess import Popen, PIPE
if cmd_gen is None:
cmd_gen = self.ffmpeg_cmd
command = cmd_gen(fname, fps, codec, frame_prefix)
verbose.report('Animation._make_movie running command: %s'%'
'.join(command))
proc = Popen(command, shell=False,
stdout=PIPE, stderr=PIPE)
+ proc.stdout.close()
+ proc.stderr.close()
proc.wait()
This was tested to work with the configuration below.
OS: Windows 7
Python Version: Python 2.7.2 |EPD 7.2-1 (32-bit)| (default, Sep 14
2011, 11:02:05) [MSC v.1500 32 bit (Intel)]
Matplotlib version: 1.1.0
ffmpeg version N-38622-g1eabd71
Best regards
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