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Rennes Emotion Map 2010-11
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Mis à jour : Juillet 2013
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Sur d’autres sites (12615)
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What do I need in order to save animation videos from matplotlib in mp3 format ?
27 juin 2022, par DarthMallocI am using python3.8 on Linux Mint 19.3, and I am trying to save an animation created by a cellular automata model in matplotlib. My actual code for the model is private, but it uses the same code for saving the animation as the code shown below, which is a slight modification of one of the examples shown in the official matplotlib documentation :


import numpy as np
import matplotlib.pyplot as plt
import matplotlib.animation as animation

fig, ax = plt.subplots()


def f(x, y):
 return np.sin(x) + np.cos(y)

x = np.linspace(0, 2 * np.pi, 120)
y = np.linspace(0, 2 * np.pi, 100).reshape(-1, 1)

fig, ax = plt.subplots()


 
ims = []
for i in range(60):
 x += np.pi / 15.
 y += np.pi / 20.
 im = ax.imshow(f(x, y), animated=True)
 if i == 0:
 ax.imshow(f(x, y)) # show an initial one first
 ims.append([im])

ani = animation.ArtistAnimation(fig, ims, interval=50, blit=True,
 repeat_delay=1000)

 # To save the animation, use e.g.
 #
 # ani.save("movie.mp4")
 #
 # or
 #
writer = animation.FFMpegWriter(fps=15, metadata=dict(artist='Me'), bitrate=1800)
ani.save("movie.mp3", writer=writer)


When executed, the code produces this error :


MovieWriter stderr:
 Output file #0 does not contain any stream

 Traceback (most recent call last):
 File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 234, in saving
 yield self
 File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 1093, in save
 writer.grab_frame(**savefig_kwargs)
 File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 351, in grab_frame
 self.fig.savefig(self._proc.stdin, format=self.frame_format,
 File "/usr/local/lib/python3.8/dist-packages/matplotlib/figure.py", line 3046, in savefig
 self.canvas.print_figure(fname, **kwargs)
 File "/usr/local/lib/python3.8/dist-packages/matplotlib/backend_bases.py", line 2319, in print_figure
 result = print_method(
 File "/usr/local/lib/python3.8/dist-packages/matplotlib/backend_bases.py", line 1648, in wrapper
 return func(*args, **kwargs)
 File "/usr/local/lib/python3.8/dist-packages/matplotlib/_api/deprecation.py", line 415, in wrapper
 return func(*inner_args, **inner_kwargs)
 File "/usr/local/lib/python3.8/dist-packages/matplotlib/backends/backend_agg.py", line 486, in print_raw
 fh.write(renderer.buffer_rgba())
 BrokenPipeError: [Errno 32] Broken pipe

 During handling of the above exception, another exception occurred:

 Traceback (most recent call last):
 File "/home/justin/animation_test.py", line 36, in <module>
 ani.save("movie.mp3", writer=writer)
 File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 1093, in save
 writer.grab_frame(**savefig_kwargs)
 File "/usr/lib/python3.8/contextlib.py", line 131, in __exit__
 self.gen.throw(type, value, traceback)
 File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 236, in saving
 self.finish()
 File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 342, in finish
 self._cleanup() # Inline _cleanup() once cleanup() is removed.
 File "/usr/local/lib/python3.8/dist-packages/matplotlib/animation.py", line 373, in _cleanup
 raise subprocess.CalledProcessError(
 subprocess.CalledProcessError: Command '['ffmpeg', '-f', 'rawvideo', '-vcodec', 'rawvideo', '-s', '640x480', '-pix_fmt', 'rgba', '-r', '15', '-loglevel', 'error', '-i', 'pipe:', '-vcodec', 'h264', '-pix_fmt', 'yuv420p', '-b', '1800k', '-metadata', 'artist=Me', '-y', 'movie.mp3']' returned non-zero exit status 1.
</module>

I have looked at posts on similar queries concerning matplotlib animations, but none have specifically included the error
Output file #0 does not contain any stream. I have little experience with ffmpeg, so I am wondering what might be missing.

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Configure FFmpeg to save the recording at specified time intervals as separate output files
27 septembre 2023, par John DoeHow can I configure FFmpeg to save the recording into separate output files at specific time intervals, for example, every 25 seconds without interrupting the recording ? By default, FFmpeg saves the entire recorded video in a single output file, but I want to create separate output files for each 25-second segment.
What steps should I follow to achieve this ?


I tried python
multiprogrammingto run the recording and saving task simultanously but didn't work.

How about using the
@ffmpeg.on("progress")event ?

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