The settings seem correct - Please rerun the video generation with the Ruby Console. ...and check that you generate all frames till frame 201. Then you should get a a 'black' window for a few second (FFmpeg). You can also check in the folder of generation whether you have all the image files, numbered from 1 to 201. If you still get a truncated video, I would suggest you get the latest version of FFmpeg. See this post for instruction