Matplotlib Animation.save() hangs from stalled pipe #2568
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The same issue occurs when using Mencoder as the backend because it also outputs to stdout/stderr... |
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@snaphat Could you possibly put together a PR to do this? |
Merged
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Option 2 seems unnecessarily complicated for our purposes; option 3 is simplest. Would it do any harm in real use cases? |
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As this only happens on 3.2 (which I think we should drop support for altogether...IPython has) punting to 1.4.x |
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According to my last comment, this is only an issue for 3.2 that we no longer 'officially' support, closing. |
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This is to report that an early fix for a bug doesn't actually work:
b836275
FFmpeg pushes status information about frames/fps/time/bitrate/etc to stderr regardless of the log level so the buffer is going to eventually fill and stall the pipe when enough information is pushed.
There are three possible solutions I see:
Redirecting stderr to a file and read that if an exception is raised.
Disabling blocking on the non-redirected file descriptor and reading/buffering the stderr into memory manually similar to the following:
http://chase-seibert.github.io/blog/2012/11/16/python-subprocess-asynchronous-read-stdout.html
Don't redirect stderr for printing on error.
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