Hi 
,
Did you try it with 59 %? I also used 90 % until recently because I thought that 90 % means high quality. The problem is that the percentage is tricking you since the standard setting is decent quality and ~70 % is high quality; everything above is not really useful. In the FFmpeg documentation the sane CRF values are between 18 and 28, 18 corresponds to 64 % in Shotcut’s UI and is stated as “vglobal_quality” next to the percentage (https://trac.ffmpeg.org/wiki/Encode/H.264).
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