If you mean "-b:v 1000k", ffmpeg doesn't allow me to run 2-pass without it. Is there another way to get CBR with ffmpeg? P. S. Thanks for your very quick answer. On 2014-11-24 15:30, James Darnley wrote: "You are setting VBV options for ffmpeg and not in mencoder (and forcing CBR at that) do I'm not surprised you get different output."