Merge upstream.

[YellowOnion]

Is there any reason why this hasn't been pushed up stream yet?

[theonlycure]

This seems orphaned. I wish this would move upstream I wouldn't have to jump back and forth from HB for NLmeans then back to ffmpeg for nvenc.

[bradleysepos]

Is there any reason why this hasn't been pushed up stream yet?

I wish this would move upstream

Likely need to convert this to standard C to be accepted.

Related, I may be porting a streamlined version of HandBrake's NLMeans to Libav in the future. I imagine ffmpeg would integrate it as well, since they tend to merge commits from Libav where relevant.

[farindk]

It's basically lack of time that I did not finalize the code for ffmpeg. I remember the main issue was the multi-threading. I used OpenMP as a quick hack, but that most probably will have to change to be accepted for ffmpeg.