save animation to mp4 fail #8053
Description
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Bug report
Bug summary
- A short 1-2 sentences that succinctly describes the bug
I was trying to save an matplotlib.animation.ArtistAnimation object to mp4. but it failed and returned error:ValueError: I/O operation on closed file
Code for reproduction
- A minimum code snippet required to reproduce the bug, also minimizing the number of dependencies required
# Paste your code here
ims = []
for i in range(5):
im1, = plt.plot(x[:,0], x[:,1], 'b.')
im2, = plt.plot(fakenp[:,0], fakenp[:,1], 'rx')
ims.append([im1, im2])
ani = animation.ArtistAnimation(fig, ims, interval=100, blit=True,
repeat_delay=1000)
ani.save('sample.mp4', writer='ffmpeg')Actual outcome
- The output produced by the above code, which may be a screenshot, console output, etc.
# If applicable, paste the console output here
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "/home/jingleng/envs/my_root/lib/python2.7/site-packages/matplotlib/animation.py", line 1013, in save
writer.grab_frame(**savefig_kwargs)
File "/home/jingleng/envs/my_root/lib/python2.7/contextlib.py", line 35, in __exit__
self.gen.throw(type, value, traceback)
File "/home/jingleng/envs/my_root/lib/python2.7/site-packages/matplotlib/animation.py", line 256, in saving
self.finish()
File "/home/jingleng/envs/my_root/lib/python2.7/site-packages/matplotlib/animation.py", line 276, in finish
self.cleanup()
File "/home/jingleng/envs/my_root/lib/python2.7/site-packages/matplotlib/animation.py", line 311, in cleanup
out, err = self._proc.communicate()
File "/home/jingleng/envs/my_root/lib/python2.7/site-packages/subprocess32.py", line 927, in communicate
stdout, stderr = self._communicate(input, endtime, timeout)
File "/home/jingleng/envs/my_root/lib/python2.7/site-packages/subprocess32.py", line 1713, in _communicate
orig_timeout)
File "/home/jingleng/envs/my_root/lib/python2.7/site-packages/subprocess32.py", line 1769, in _communicate_with_poll
register_and_append(self.stdout, select_POLLIN_POLLPRI)
File "/home/jingleng/envs/my_root/lib/python2.7/site-packages/subprocess32.py", line 1748, in register_and_append
poller.register(file_obj.fileno(), eventmask)
ValueError: I/O operation on closed file
Expected outcome
it saves the animation to video file 'sample.mp4'.
Matplotlib version
- using matplotlib 2.0.0, Python 2.7.13 :: Anaconda 2.1.0 (64-bit), on OSX.
- installed both python and matplotlib through anaconda.