![]() It is important to set the video bitrate to zero. For VP9, the CRF can range from 0 (best quality) to 63 (smallest file size). ![]() Setting the video bitrate to zero while also specifying the CRF (Constant Rate Factor) enables Constant Quality mode which targets a certain perceptual quality level. Use two-pass Constant Quality mode:¹ ffmpeg -i input.mp4 -b:v 0 -crf 30 -pass 1 -an -f webm -y /dev/nullįfmpeg -i input.mp4 -b:v 0 -crf 30 -pass 2 output.webm
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