我想以gif格式保存matplotlib动画.
我成功地使用代码将动画保存为mp4格式
import matplotlib
matplotlib.use("Agg")
~some codes~
ani = animation.FuncAnimation(fig,draw,update,interval=10,blit=False)
mywriter = animation.FFMpegWriter(fps=60)
ani.save('myanimation.mp4',writer=mywriter)
但如果我将myanimation.mp4更改为gif格式,python会出错
Traceback (most recent call last):
File "C:\Users\Administrator\Desktop\edison\Edison_v4_backup_1\ver5.py",line 164,in <module>
ani.save('demoanimation.gif',writer=mywriter);
File "C:\Python27\lib\site-packages\matplotlib\animation.py",line 718,in save
writer.grab_frame(**savefig_kwargs)
File "C:\Python27\lib\site-packages\matplotlib\animation.py",line 204,in grab_frame
dpi=self.dpi,**savefig_kwargs)
File "C:\Python27\lib\site-packages\matplotlib\figure.py",line 1421,in savefig
self.canvas.print_figure(*args,**kwargs)
File "C:\Python27\lib\site-packages\matplotlib\backend_bases.py",line 2220,in print_figure
**kwargs)
File "C:\Python27\lib\site-packages\matplotlib\backends\backend_agg.py",line 497,in print_raw
renderer._renderer.write_rgba(filename_or_obj)
RuntimeError: Error writing to file
看到我成功保存为mp4格式,我不知道为什么它在保存gif格式时会出错.
解决方法
这是因为没有外部程序,matplotlib不支持GIF.如果您正确安装和配置了imagemagick,则应该可以：
import matplotlib
matplotlib.use('Agg')
import matplotlib.pyplot as plt
import matplotlib.animation
import numpy as np
def init_animation():
global line
line,= ax.plot(x,np.zeros_like(x))
ax.set_xlim(0,2*np.pi)
ax.set_ylim(-1,1)
def animate(i):
line.set_ydata(np.sin(2*np.pi*i / 50)*np.sin(x))
return line,fig = plt.figure()
ax = fig.add_subplot(111)
x = np.linspace(0,2*np.pi,200)
ani = matplotlib.animation.FuncAnimation(fig,animate,init_func=init_animation,frames=50)
ani.save('/tmp/animation.gif',writer='imagemagick',fps=30)
