[Cin] our ffv1.mkv profile

[Andrew Randrianasulu]

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?
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