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But the colors are fixed?

Yes they fixed, but as I said there are some artifacts, black and dark blue patches.

I finally found the problem and the solution. The tone mapping was done but BT.2020 colors (wide gamut) was not converted to BT.709 (smaller gamut). That explains the less saturated colors (smaller values were not expanded). This is fixed in the 4.0 master and will be available in the nightly build...

Excellent news , looking forward for it.

I played the video myself both in Waterfox and VLC, but don't get the washed out color appearance. If anything, the VLC color reproduction looks better than it does on Waterfox. https://thumbs2.imgbox.com/fc/12/0MivkcnH_t.png (click to enlarge) Looks to me you are streaming (Youtube and VLC) , down...

Are you in HDR mode, or SDR tone-mapping?

Sorry for late reply, I tried everything , finally gave up.
Went with PotPlayer + madvr.
sample video is here you guys can download and test it:

Nightly Build of VLC ?

Same result, washed up colors.

Here is example of VLC and KMPlayer(madVR)




I searched a lot but looks like there is no way of fixing it, is there any plan to fix this issue in future updates?
Thanks