Brightness stabilization?

[killerteengohan]

I know you can stabilize the screen, but I have a source that looks like its flashing brighter and darker rapidly every frame as its playing.

Video sample
https://mega.nz/file/0ghHFKbT#Q6YJRwsPB9AT_S1DPLhd57AY_Ufzn_3_xKKXuWM9gY8

Are there any avisynth filters to level that out or help make it less obvious?

[Selur]

Filters under http://avisynth.nl/index.php/External_filters#Luma_Equalization or Small_Deflicker should help.

Cu
Selur

[johns0]

Upload sample to this forum,you can go to 500MB in size,nobody wants to go to mega for files.

[killerteengohan]

Filters under http://avisynth.nl/index.php/External_filters#Luma_Equalization or Small_Deflicker should help.

Cu
Selur

Do I have to use denoising in those filters to get the result I am looking for? I would like to avoid having to smear stuff if possible.

[Selur]

afaik. those filters to not denoise

[jagabo]

I think all the successful deflicker filters use some form of temporal pixel averaging. This is because different parts of the frame often flicker differently (as does your video).

A mild SMDegrain can help without damaging the picture too much:

SMDegrain (tr=3, thSAD=500, refinemotion=true, contrasharp=false, PreFilter=4, mode=0, truemotion=true, plane=4, chroma=false)

You might try following up with a grain restoration function.

Sample with SMDegrain added:

[johnmeyer]

I think you can fix that quite well, although the non-standard frame rate of animation might cause some problems.

First, you may only need to use Deflicker. I use this on film all the time. I have queued up my restoration before/after examples to a scene in which was "brightness stabilized" with just deflicker:

https://www.youtube.com/watch?v=tBAHzO7rJS0&t=116s

In addition, there is a little-known effect of using the MVTools2 denoising which, with the correct parameter, can also remove a lot of noise. The only downside is that it makes MVTools2 run at about 1/4 it's normal speed. The "secret" is to use dct=1 in all MAnalyze calls. You use MAnalyze before the call to MDegrain. Since QTGMC uses MDegrain, you can look at the documentation for how to feed it dct=1 (it uses the default of dct=0), or you can go into the AVSI QTGMC code and change it directly.

[killerteengohan]

I think all the successful deflicker filters use some form of temporal pixel averaging. This is because different parts of the frame often flicker differently (as does your video).

A mild SMDegrain can help without damaging the picture too much:

SMDegrain (tr=3, thSAD=500, refinemotion=true, contrasharp=false, PreFilter=4, mode=0, truemotion=true, plane=4, chroma=false)

You might try following up with a grain restoration function.

Sample with SMDegrain added:

Wow that did a great job at helping with that brightness flickering. I can't even tell it was ever a problem.