FuncAnimation video saving results in one frame file

[nils-werner]

When trying to use the basic_example_writer.py example I have noticed that the first file generated, lines.mp4, is empty. It shows one frame of plot backdrop but none of the lines appear.

This also happened with any other animation I myself was trying to write. Thus it seems that FuncAnimation ins incapable of creating animation videos.

Tried on platforms: Mac OSX and Ubuntu 14.04

[jenshnielsen]

I think this is a duplicate of #5399 fixed by #5402

[jenshnielsen]

The workaround is to add an init function to the function animator. That should work even if it is a noop

[nils-werner]

That is indeed correct, sorry for not spotting the other issue earlier. :-)

[jenshnielsen]

No problem :)