On Mon, 11 Jan 2016 01:00:01 +0100 Moritz Barsnick <barsnick at gmx.net> wrote: > In other words: "-level 41" does change something, but not in the same > way "-level 4.1" does. :-/ x264 binary accepts either and outputs the expected number of refs. Worth reporting as a bug. Related to, or can be considered to be, bug #3307: https://trac.ffmpeg.org/ticket/3307