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What is the difference between -crf and -cq parameters of ffmpeg? I am trying to compress 1080p h264 videos into 1080p h265 videos with high quality and low size. I have noticed that in some guides they use -crf while in others they use -cq + -qmin + -qmax.

I have tried researching the difference and all I could come with is that with -crf the size is a bit lower because it reduces data for scenes with fast actions that the person watching would not notice while with -cq that is not the case. Is that it? Are there any more differences? If I have used a number with -crf would the result be similar if I were to use the same number with -cq?

Thank you.

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cq is constant quality mode, available for nVidia and Android hardware encoders, and is basically equivalent to crf which is available for many of the software encoders.

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    Am I right to assume that cq is more GPU based settings while crf is CPU based setting? Also, how are numbers correlated between them? Would 24 crf be equivalent to 32 cq for example?
    – jamana
    Commented May 9 at 4:56

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