[FFmpeg-user] Equivalent parameter for CRF in hevc_videotoolbox

桃源老師 xanadu6291 at dream.jp
Wed Dec 5 16:54:42 EET 2018

Hello list member, 

I recently noticed that ffmpeg can use hardware acceleration via videotoolbox on Mac.

Before above discovery, I use the command like as follows:

ffmpeg -i DR08.ts -c:v libx265 -preset medium -crf 23 -tag:v hvc1 -vsync 1 -c:a copy -bsf:a aac_adtstoasc DR08.mp4

Now I noticed that CRF does not work on hevc_videotoolbox codec.  Based on very rough trying, -b:v only changes quality of encoded video.

So my question is is there equivalent parameter for CRF in hevc_videotoolbox codec or not.  In another word, how to set quality of hardware acceleration of video?

I have googled about this, but I can’t get the answer.  So please help me!!

// Miya aka. TougenRoushi

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