[FFmpeg-user] Equivalent parameter for CRF in hevc_videotoolbox

[桃源老師]

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

-------------- next part --------------
A non-text attachment was scrubbed...
Name: smime.p7s
Type: application/pkcs7-signature
Size: 3884 bytes
Desc: not available
URL: <http://ffmpeg.org/pipermail/ffmpeg-user/attachments/20181205/53dbeb76/attachment.bin>