[FFmpeg-user] x264 preset (speed) question

[Carl Eugen Hoyos]

2016-11-21 0:33 GMT+01:00 Toerless Eckert <tte at cs.fau.de>:
> ffmpeg -i ...  -vcodec libx264 -crf 23 -preset <profile> ...avi

Missing complete, uncut console output.

Note that this is not the x264 mailing list.
(Assuming you can reproduce with the x264 binary.)

>  size                encoding
>            preset    time [sec]
>  343112796 ultrafast 32
>  203951436 superfast 40
>  144580586 veryfast  57
>  151997548 faster    82
>  154328836 fast      115
>  153417634 medium    140
>  153318596 slow      245
>  150477566 slower    408
>  141542408 veryslow  785
>
> this looks all very logical - spend more time, get better compression

Yes.

> at same quality.

Why do you think so?
I believe this is the same question I asked Matteo
(but remember that my knowledge about encoding
with modern video codec implementations is limited).

Carl Eugen