Question / Help Very Strange RBG Colour Issue

[Grumbul]

So this is an interesting one. I use a dual stream set-up and have my Gaming PC set up to output Full RGB (Desktop colour set at highest (32bit), Output colour depth set at 8, Output colour format set to RGB and Output dynamic range set to Full).

I have my HD60 set to capture in Extended range and OBS set to YUV Color Space 709 and YUV Color Range set to Full.

Everything looks great and if I bring up a Full RGB Test Card on my gaming pc the capture screen and the main gaming screen show the full range.

However!

If I play back a video on either the stream pc or the gaming rig I get incredibly washed out blacks. Pause the video on this link at 6hours, 16minutes and you'll get a good idea of what I mean:

https://www.twitch.tv/videos/306932670

Any ideas?

 

[TryHD]

there are two things that apply here
1st the convertion from RGB to YUV4:2:0 which will wash out red
2nd that browsers don't seem to handle full range good

so 709 with partial is the best for twitch afaik. Please correct me if 2nd point has changed in the past.

 

[Grumbul]

This is mainly regarding blacks.

If I watch a stream with Chrome (so Gaming Rig plays the video and it is streamed through the capture card then to the monitor and I switch from expanded to standard I lose a ton of black detail. In other words everything looks a lot better on my screen.

However as you can see in that video above the blacks from the capture are VERY washed out.

 

[koala]

The detection of full range video seems flawed in many video editors, converters, players. To avoid such issues, you can use full range only for the production and distribution steps you are able to control yourself, and partial range for the production and distribution process you aren't able to control.
This means you can use full range from capture through postprocessing, but the final video that is being uploaded to a distribution service should/would be partial to minimize issues within the distribution/recoding/player part.

On the other hand, your video does not necessarily suffer from a full/partial range conversion problem. Yes, the black in the center parts of your video is grey actually (RGB 8,9,8), but if you take the color in the top left corner, you will have a (RGB 2,2,2). This does not seem to be the result of a false full/partial conversion, because if it were, the black parts would be the same greyish color over the whole picture. The irregular black level shift is perhaps the result of some automatic video "enhancing" function somewhere that tries to light up rather dark parts of the image.

To find out what happens, upload videos with test content. Upload one video made with full range and the same video made with partial range. Do they look roughly the same, for example are they perhaps both washed out? If they are, then it has nothing to do with full/partial but with some other video processing. If they are really different, for example the partial range video has correct colors while only the full range video has washed out colors, than it has to do with processing/recoding/replaying of the full range video.