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HDR and 10bit support
02-17-2016, 01:09 PM
Post: #1
HDR and 10bit support
Please, looking for feedback on HDR and 10bit support.

I actually have a 4K projector that is not HDR capable, so will be looking for HDR to SDR conversion in the near future @ 4K resolution (not downcoverted to 1080p).

I understand OHC can output 4K@24 at 10bits. It surely can play back 4K HEVC 10bit files, but want to make sure we will have actually 10bits going into the HDMI interface (when using colorspace 4:2:2).
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02-23-2016, 04:56 PM
Post: #2
RE: HDR and 10bit support
(02-17-2016 01:09 PM)afss Wrote:  Please, looking for feedback on HDR and 10bit support.

I actually have a 4K projector that is not HDR capable, so will be looking for HDR to SDR conversion in the near future @ 4K resolution (not downcoverted to 1080p).

I understand OHC can output 4K@24 at 10bits. It surely can play back 4K HEVC 10bit files, but want to make sure we will have actually 10bits going into the HDMI interface (when using colorspace 4:2:2).

After a lot of testing, it seems that OHC is unable to output more than 8bits on its HDMI interface. It's disappointing as it can playback 10bit HEVC files, but on all the testing I have done, it always gets downgraded to 8bits on the actual interface.
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02-23-2016, 07:37 PM
Post: #3
RE: HDR and 10bit support
Have you tried outside of Kodi?

There isn't a media player with a chip that has HDR as far as I know out yet.

Make sure you have h265 10bit not h264. psarips has some releases marked HQ10x265 which have samples and mediainfo.

Don't have a 4k set yet waiting for a decent 4K HDR TV that the community recognises as 'the one'. Waiting for one that hopefully does both HDR standards as well which are not yet out.

OHC > HDMI > TV (Panasonic 42G20)
Downmix stereo using standard Kodi(MC) 15.2 no hware/acc OK
Downmix stereo 1.0.40/RK Kodi(RKlib) 15.2 infrequent audio gaps hware/acc OK

No DTS downmix available for inbuilt eMC player

Gecko> HDMI > TV (Panasonic 42G20)
Downmix stereo using Gecko Kodi 15.0 OK
Downmix using inbuilt MediaCentre OK

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02-23-2016, 07:47 PM
Post: #4
RE: HDR and 10bit support
(02-23-2016 07:37 PM)chris57 Wrote:  Have you tried outside of Kodi?

There isn't a media player with a chip that has HDR as far as I know out yet.

Make sure you have h265 10bit not h264. psarips has some releases marked HQ10x265 which have samples and mediainfo.

Don't have a 4k set yet waiting for a decent 4K HDR TV that the community recognises as 'the one'. Waiting for one that hopefully does both HDR standards as well which are not yet out.

Hello, yes I tried also with the native player with the same results - I have good HEVC 10bit 4K test files (they are not h264), but the result is always 8 bits on the HDMI interface (either outputing 4K resolution or downscaling it to 1080p). By comparison, my OPPO 93 sends 1080p with 10bits, when I select deepcolor - so the cable/display do accept it (I can confirm the 10bits signal on my display info screen).

I believe there should be a video selector on the advanced options of OHC, just like we have for colorspace (4:4:4, 4:2:2 and 4:2:0), in order to enable 10bits on the HDMI interface.
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03-05-2016, 10:02 AM
Post: #5
RE: HDR and 10bit support
Have a look at the WIKI OHC FAQ as under HDMI2.0 it details the colourspace option, think its only 4.4.4 but have a look.

OHC > HDMI > TV (Panasonic 42G20)
Downmix stereo using standard Kodi(MC) 15.2 no hware/acc OK
Downmix stereo 1.0.40/RK Kodi(RKlib) 15.2 infrequent audio gaps hware/acc OK

No DTS downmix available for inbuilt eMC player

Gecko> HDMI > TV (Panasonic 42G20)
Downmix stereo using Gecko Kodi 15.0 OK
Downmix using inbuilt MediaCentre OK

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