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

[Aditya Dandavate]

Sorry for top-posting 🙏

My content is gaming content, and I record the gameplay in form of .lmp
files.

When a command ( which isn't related to ffmpeg ) is given from a batch
file, the gameplay starts being played back.

During the playing back of the gameplay, the audio and video are encoded
simulataenously.

So, even if I wish, I can't use 2 pass encoding.

So, which option from the 2 should I stick to ? CVBR or ABR ?

On Fri, 1 Nov, 2024, 3:35 pm Ferdi Scholten, <ferdi at sttc-nlp.nl> wrote:

> 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.
> >> _______________________________________________
> >>
> First, please stop top posting in this list! read the guidelines for
> posting!
>
> Second to answer your question: It all depends on the content. There is
> no general "best quality type of encoding"
>
> If you want the best quality for your given constraints (filesize and/or
> bitrate) and you are not live streaming you should always use multiple
> pass encoding,
> if you are live streaming, read this:
> https://trac.ffmpeg.org/wiki/StreamingGuide
>
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