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

[Ferdi Scholten]

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