保存matplotlib动画时出错

Question

我在用matplotlib制作一个动画热图。我在一个文本文件（rs_h）中有3列数据-x，y，z；我使用scatterplot制作一个简单的热图，然后使用动画包随着时间的推移更新热图

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

data = pd.read_table('rs_h', header=None, sep=r"\s*")

frames = np.array_split(data, 9)

def main():
    numframes = 9
    numpoints = 75

    x, y, c = np.random.random((3, numpoints))

    fig = plt.figure()
    scat = plt.scatter(x, y, c=c)#, s=100)

    ani = animation.FuncAnimation(fig, update_plot, frames=xrange(numframes), 
                              interval = 5)
    #ani.save("movie.avi", codec='avi')
    plt.show()

def update_plot(i):
    frame = frames[i]
    scat = plt.scatter(frame[0], frame[1], c=frame[2])
    return scat,

main()

我很容易得到动画热图；但是，当我试图保存动画时遇到了一个问题

/Users/Arjun/anaconda/lib/python2.7/site-packages/matplotlib/animation.py:695: UserWarning: MovieWriter ffmpeg unavailable
  warnings.warn("MovieWriter %s unavailable" % writer)
Traceback (most recent call last):
  File "heat_ani.py", line 29, in <module>
    main()
  File "heat_ani.py", line 21, in main
    ani.save("movie.avi", codec='avi')
  File "/Users/Arjun/anaconda/lib/python2.7/site-packages/matplotlib/animation.py", line 712, in save
    with writer.saving(self._fig, filename, dpi):
AttributeError: 'str' object has no attribute 'saving'

有人知道问题是什么以及如何解决？

编辑：问题是我没有安装ffmpeg。一个简单的brew安装允许代码工作

Answer 1

我找到一个solution for Linux。基本上你需要ffmpeg库或libav工具

打开终端并键入为根

apt-get install ffmpeg

或者

apt-get install libav-tools

希望能有所帮助。