Video Gamma / Black Levels  

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mzenvfx
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Video Gamma / Black Levels

by mzenvfx » Mon Mar 19, 2018 7:45 pm

Hi,

I'm using GoPro VR Player (tested with version 2.x and 3.x) on Win 10 64bit and also tested on other Windows machines.
On all systems the black is always a washed out grey, even with a perfectly black video. (mp4/h264) Changing the backend doesn't change anything. Same videos have correct brightness/black levels in other players, non-VR (VLC etc.) and VR (DeoVR etc.) on the same system. I'm using it with Oculus Rift. (but it's already present without the headset on normal screen)

Any idea, why this is the case?

Thanks a lot,
Marc

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Re: Video Gamma / Black Levels

by mzenvfx » Wed Mar 21, 2018 6:50 pm

No-one else experiencing this? This really takes the fun out of low-key content.

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Re: Video Gamma / Black Levels

by mzenvfx » Wed Mar 21, 2018 6:50 pm

No-one else experiencing this? This really takes the fun out of low-key content.

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lmartin
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Re: Video Gamma / Black Levels

by lmartin » Thu Mar 22, 2018 9:27 am

Yes indeed there an issue on Windows but it is ok on Mac.

The problem can occur according to specific parameters (pixel format, GPU driver), it is about color range when converting from YUV to RGB, we use 'StretchRect' DirectX function. Technical details are explained here : https://bugs.chromium.org/p/chromium/is ... ?id=173145

Thank you for the feedback, we will check what can be done here !

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Re: Video Gamma / Black Levels

by mzenvfx » Thu Mar 22, 2018 9:45 am

Thanks! Would be great to have a correct range on windows, too. Mac is not an option for me. ;-)


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