保存matplotlib.animation输出0秒视频 [英] Saving matplotlib.animation outputs a 0 second video

问题描述

当我使用 pyplot.show 而尝试使用 animation.save时，我对于matplotlib和动画是相当新鲜的。 功能，唯一输出的是0秒的视频，动画的初始帧。

这是我的代码：

  plt.rcParams ['animation.ffmpeg_path'] = r'C：\FFMPEG\bin\ffmpeg.exe'
 FFwriter = animation.FFMpegWriter（）
 video_ani.save（'basic_animation1.mp4'，writer = FFwriter，fps = 30，extra_args = [' -  vcodec'，'libx264']）
  

任何帮助不胜感激，谢谢

解决方案>

我想你需要向FFMpegWriter类提供参数，而不是 animate.save 。文件说：

fps，编解码器，比特率，extra_args，元数据用于构建MovieWriter实例，只有在writer是一个字符串。

所以你可以尝试

  FFwriter = animation.FFMpegWriter（fps = 30，codec =libx264）
 video_ani.save（'basic_animation1.mp4'，writer = FFwriter）
  / pre> 
 
 
使用编解码器参数指定编解码器，而不是一些额外的参数。 
 
 
 
从您可能需要测试某些内容的Appart：
 
 
 
 
 
可以将动画保存为动画GIF吗？ 
 
 
 
 
如果是，则创建mp4时，您有问题，
 
 
如果否，您可能有问题动画本身。 
 
 
 
 
 
使用其他编解码器规范做什么？我总是使用 codec =h264，也许这很重要。
 
 
 
I am fairly new to matplotlib and animations, the animation I have works when using pyplot.show but when attempting to use the animation.save function, the only thing outputted is a 0 second video with the initial frame of the animation.

This is my code:
plt.rcParams['animation.ffmpeg_path'] = r'C:\FFMPEG\bin\ffmpeg.exe'
FFwriter = animation.FFMpegWriter()     
video_ani.save('basic_animation1.mp4', writer = FFwriter, fps=30, extra_args=['-vcodec', 'libx264'])
Any help would be appreciated, thanks
解决方案
I think you need to supply the arguments to the FFMpegWriter class, not to animate.save. The documenation says:

  
fps, codec, bitrate, extra_args, metadata are used to construct a MovieWriter instance and can only be passed if writer is a string.
So you could try
FFwriter = animation.FFMpegWriter(fps=30, codec="libx264")     
video_ani.save('basic_animation1.mp4', writer = FFwriter )
where the codec is specified using the codec argument instead of some extra argument. 

Appart from that you'd probably need to test certain things: 


Can you save the animation as animated gif? 


If yes, then you have a problem creating the mp4, 
if no, you may have a problem with the animation itself. 

What does using another codec specification do? I always used codec="h264", maybe that matters.


                        
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