What's the VP9 parameter arnr-maxframe ?

[kidmany2001]

hi ,

What's the meaning of VP9 parameter --arnr-maxframe ?

I don't know when we should set this or what's the purpose ?

Do someone know ?

Thanks

The official explanation is as below:
However, many other options are possible and one alternative that has been implemented uses a temporally filtered image derived from a group of future frames. The extra control parameters for this are:

--arnr-maxframes=<arg>(number of frames to filter over 0-25)

[Selur]

if I remember correctly (haven't looked at it in ages; VP9 not having a decent rate control and being dawn slow kills it for me)
--arnr-maxframes, requires: --auto-alt-ref=1
and sets the maximal number of frames which will be used for noise reduction, depending on the range some stuff will be detected as noise and other won't
What value makes sense for you will depend on your source. -> best you simply do some testing :)