[matplotlib-devel] Animation.save not working?

I am trying to make an animation of the double pendulum using the
attached script (v1.1.x branch).  It creates all the files _tmp*.png,
and creates the mpg but it has zero file size.  If I manually make the
movie with the resultant PNGs, it works fine

mencoder mf://_tmp*.png -mf type=png:fps=15 -ovc lavc -lavcopts
vcodec=mpeg4 -oac copy -o test2.mpg

I need to add some debugging output to animation.py (we should add
lots of verbose.report command in there to see what is going on, I'm
going to try and get a pull request together) but I thought I'd fire
this off to anyone else has the same problems or if I'm doing it
wrong.  I do have ffmpeg and mencoder installed on my 64bit ubuntu
11.04 box.

Thanks,
JDH