Error
http://i.imgur.com/12Xml0D.png

Args:
-f rawvideo -vcodec rawvideo -s 1280x720 -pix_fmt rgb24 -r 24 -i - -an out.mp4

Based on example:
http://zulko.github.io/blog/2013/09/27/read-and-write-video-frames-in-python-using-ffmpeg/