I’ve always thought that setting -crf [x] determines the output quality, while 
(in the same line) -preset [x] affected the output file size.
(Where faster speeds result in bigger output files at the same quality.

But now this:
https://trac.ffmpeg.org/wiki/Encode/H.265 
<https://trac.ffmpeg.org/wiki/Encode/H.265>

Under the Constant Rate Factor (CRF):

-Put differently, if you choose ultrafast, the encoding process is going to run 
fast, and the file size will be smaller when compared to medium.

WTF? I would think the output file size will be bigger? (I take it this is just 
a stupid mistake…)

Then, the line continues:
-The visual quality will not be as good. 
 
Now it gets confusing. This sorta kinda suggests that -crf and -preset are not 
to be used together?

What am I missing here?

Thx,

Bouke
_______________________________________________
ffmpeg-user mailing list
ffmpeg-user@ffmpeg.org
https://ffmpeg.org/mailman/listinfo/ffmpeg-user

To unsubscribe, visit link above, or email
ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".

Reply via email to