.mp4 output via FFmpeg fails.

[ailgun]

Thanks for the reply, it actually works on simpler things which I do, I mean I can get .mp4 outputs. But no luck with this one.
I re-installed ffmpeg and x264 via pip again but no luck either.

I guess I'll have to compose a video from the still pngs by keeping the 'temp' and using a video software.

Best wishes.