[FFmpeg-user] FFmpeg and libx264 presets and Constant Rate Factor (CRF)
friendjane at nefu.edu.cn
Sat Aug 7 17:12:34 EEST 2021
Sure it is. That’s why it’s called “constant visual quality”. The preset has (almost) nothing to do with quality. It only affects speed.
> 在 2021年8月7日，下午5:06，Bill Crockett <wsc4 at optusnet.com.au> 写道：
> First of all, I am not doing 2 pass encoding. I am using the CRF option.
> They say for constant quality encoding, you will save bitrate by choosing a slower preset. A slower preset will provide better compression.
> medium – default preset
> I do not care about compression or files size. But I do care about quality.
> If I choose a CRF of 20, and I use the "veryslow" preset, the quality will still be the same if I choose a CRF of 20 and use the "superfast" preset?
> The same with this. If I choose a CRF of 10, and I use the "veryslow" preset, the quality will still be the same if I choose a CRF of 10 and use the "superfast" preset?
> Is this correct about the quality please?
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