Anyone know why #ffmpeg with these arguments
-map 0 -map -0:d -c:a copy -c:s copy -c:v libx265 -x265-params log-level=error:strong-intra-smoothing=0:rect=0:aq-mode=1:rd=4:psy-rd=0.75:psy-rdoq=4.0:rdoq-level=1:rskip=2 -level:v 50 -preset slow -crf 23
keep producing files at level 5.1 instead of the specified 5.0? I tried using 'level-idc=50' in the -x265-params but that failed with bad arguments.