[Cin] our ffv1.mkv profile

seems to miss level=3 setting $ cat bin/ffmpeg/video/ffv1.avi avi ffv1 $ cat bin/ffmpeg/video/ffv1.mkv matroska ffv1 threads=8 context=1 slices=30 $ cat bin/ffmpeg/video/ffv1.mov mov ffv1 #coder=0 context=1 g=1 level=3 threads=16 slices=16 slicecrc=1 #pass=2 $ not sure if we should modify our avi/mkv profikes or add new (may be with _v3 name) ones?