[FFmpeg-user] Can this trigger VBR encoding for x264, x265, and libvvenc ?

[Aditya Dandavate]

Also, in general case, for gaming content, between CVBR and ABR, which
provides better quality at same filesizes ?

On Wed, 30 Oct, 2024, 7:40 pm Ferdi Scholten, <ferdi at sttc-nlp.nl> wrote:

> Okay, thank you sir.
> > Should I keep the bufsize 5 times that of maxrate ? Will that help in
> > effective allocation of bitrates ? Also, for getting the best possible
> > quality in this case, how high should be the value of bufsize ? What is
> > your recommendation ?
> >
> >   (I use the slow preset for both x264 and x265 for getting better
> quality
> > at same filesizes btw).
> >
> > On Wed, 30 Oct, 2024, 6:25 pm Ferdi Scholten,<ferdi at sttc-nlp.nl>  wrote:
> >
> >> If I set " -b:v 5000k -maxrate 6000k -minrate 4000k " for x264, x265 and
> >>> vvenc, will this enable VBR encoding for these three encoders ?
> >>> _______________________________________________
> >>>
> >> If "constrained VBR" is what you want then the answer is yes.
> >>
> >> It is not true VBR because it will never get below minrate or above
> >> maxrate even if it would be possible/necessary for maintaining the
> >> encoding quality
> >> _______________________________________________
> >>
> try to see it like this, the bufsize/maxrate is the frequency at which
> ffmpeg checks for the need of changing the bitrate.
> This is of course highly dependent on the type of content you have.
> Detailed content with high motion and/or lots of scene changes will do
> best with bufsize = maxrate, while for more static content bufsize can
> be >= 5 times maxrate.
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