ffmpeg -loglevel verbose -i 2398.mov -pix_fmt yuv420p10le -codec:v libx264  -x264opts -profile:v high10 -preset veryslow -crf 10 -c:a copy -map 0:v -map 0:a -y TEST_CRF10_veryslow.mkv


[NULL @ 000002750cd40980] Unable to find a suitable output format for 'high10'
high10: Invalid argument
[AVIOContext @ 000002750c924800] Statistics: 5534433 bytes read, 4 seeks