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iPlayer HLG/UHD HDR on Samsung’s J and K Series TVs

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How exactly did you fix the colour space issue dunwell?

Explorer
So the PS4 bbc iPlayer app gets a UHD update but my ks8000 that I bought last year won't actually display in HDR.
Great.
Helping Hand

@tarbat wrote:

@Moily wrote: 
Just realised the HDR sampling on mine was on 4:2:0, changed to 4:2:2 and the colour boosted significantly so had to dial it back down to 50.

Interesting that switching from 4:2:0 to 4:2:2 boosted colour saturation. Surely that must be a bug either in the Roku, or more likely the TV.


I can offer some speculation I'm assuming we are talking about the 4K50/60Hz modes.

 

4K50/60 4:2:0 is one of three different modes. in HDMI2.0a/b this can either be 8, 10 or 12 bits.

 

However, 4K50/60 4:2:2 is only supported at 12bit. 8 and 10bits are NOT supported in HDMI2.0a/b

 

The PS4Pro uses this mode for its HDR gaming. The content isn't at 12bits of colour depth, but this mode is instead used as a "container" for the 8 or 10bit content.

 

So, by setting 4:2:2 perhaps you are forcing it to use the 12bit mode. And, perhaps the Samsung behaves differently when it sees this mode. Perhaps the bug only applies to the 10bit modes, for whatever reason.

 

Either way I can now see a lot more why Samsung Engineering kept saying HLG-over-HDMI wasn't "supported" when we kept insisting it worked - that's Engineer-speak for "buggy and/or doesn't work reliably".

 

Voyager

@dunwell wrote:

Is this bug directly causing the “wrong gamma curve” issue?

 

Since I fixed the random colour space issue I’ve put gamma back to zero and it looks brilliant. 


The "wrong gamma curve" issue will cause colours in the luminence mid-range to appear overly bright.  Setting the gamma to -3 helps move that wrong gamma curve closer to the correct gamma curve, by bending the RED line in this chart to be closer to the BLUE target line.

1.jpg

 

The "wrong colour space" issue causes colour across the whole luminence range to be under-saturated, as instead of occuping the REC.2020/P3 colour space (the BIG TRIANGLE), they only occupy the REC.709 colour space (the SMALL TRIANGLE). Setting the colour space to CUSTOM forces the TV to use the big triangle.

2.jpg


@Neil81 wrote:
So the PS4 bbc iPlayer app gets a UHD update but my ks8000 that I bought last year won't actually display in HDR.
Great.

PS4 isn't receiving the HLG stream it seems. 

 

Not sure why, it's capable.

Helping Hand

@Neil81 wrote:
So the PS4 bbc iPlayer app gets a UHD update but my ks8000 that I bought last year won't actually display in HDR.
Great.

Welcome to December 2017. Now go back 387 pages

 

Hold on lads, don't just the Roku/PS4 out just yet, there might have been production issues at the Beeb end to blame for the washed out look and flickering.

Hold on lads, don't just the Roku/PS4 out just yet, there might have been production issues at the Beeb end to blame for the washed out HDR look and flickering.

First Poster

The flickering during tonight's game was only a BBC issue as it wasn't visible on the Dutch or Belgian feeds... It was however very noticeable.

 

The washed out color HDR issue seems more Samsung as it is consistently bad across countries and different feeds on these models.

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So the suggestion from turbat is to set the colour space to auto am I right in order to force the colour space to rec2020. Am I correct?

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