[FFmpeg-user] FFmpeg and libx264 presets and Constant Rate Factor (CRF)

[Bill Crockett]

Am Sa., 7. Aug. 2021 um 11:12 Uhr schrieb Bill Crockett
<wsc4 at optusnet.com.au>:

> 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?

The quality will be (very) similar in both cases, it will not be 100%
identical.

Carl Eugen

It will not be 100% identical?

Do you mean the "very slow" compared to the "superfast" at a CRF is not
100%?  Or, a CRF of 20 compared to a CRF of 10 is not 100%?