HDR, 4K questions

Current nightly builds for x86-64 (Generic builds) are supporting HDR and it is sent to the display device so that any tone mapping would be done there. The current stable releases for x86-64 do their own tone mapping, which is not what you're looking for.

I also looked up your CPU - you are right. It's from 2015 and lacks the acceleration hardware needed for h.265. It depends on your budget and what else you need, but I am using a relatively low power Gemini Lake cpu and that is OK with 4k60 using h.256/HEVC, so there's no strict requirement to go for the latest silicon. One thing to watch out for is how the HDMI output is handled. Some NUCs, for example, have used an additional chip in the display driver circuit (known as an LSPCON chip) to allow the port on the box to reach HDMI 2.x standards. While they can work, success with LibreELEC is more likely if you can verify that your chosen solution does not use an LSPCON chip.

Kodi has no support for tonemapping and is unlikely to gain that capability anytime soon. Most hardware Kodi currently runs on either lacks the specialist image manipulation capabilities to do on-the-fly tonemapping, or the hardware can do it, but support hasn't been implemented in the Linux kernel and drivers yet; and hence there's no need (and not much point) trying to support it right now.

In simplistic terms: Kodi simply outputs video with an appropriate resolution, colour depth, colour-space, and HDR flagging as detected from the media being played and within the constraints of what the hardware (HTPC) can output. As not all hardware supports all combinations (read from the HDMI EDID data) Kodi will sometimes output in a higher bit-depth or nearest colour-space from possible output formats. It's then up to the display device (Monitor/TV/Beamer) to figure out how to display that combination.

Apologies chewitt - wrong terminology and misunderstanding on my part.

Quote from chewitt

Kodi has no support for tonemapping and is unlikely to gain that capability anytime soon. Most hardware Kodi currently runs on either lacks the specialist image manipulation capabilities to do on-the-fly tonemapping, or the hardware can do it, but support hasn't been implemented in the Linux kernel and drivers yet; and hence there's no need (and not much point) trying to support it right now.

In simplistic terms: Kodi simply outputs video with an appropriate resolution, colour depth, colour-space, and HDR flagging as detected from the media being played and within the constraints of what the hardware (HTPC) can output. As not all hardware supports all combinations (read from the HDMI EDID data) Kodi will sometimes output in a higher bit-depth or nearest colour-space from possible output formats. It's then up to the display device (Monitor/TV/Beamer) to figure out how to display that combination.

Today I found out that my Rpi4 can play 4k hdr10 file, but with washed-out colors... while my Huavei laptop, Ryzen 5 3500u, running Kubuntu, can play the same file just perfect (with vlc and Kodi), with HW acceleration and very nice colors? Why is that? why Rpi4 can not do it?

Quote from ivobo

Today I found out that my Rpi4 can play 4k hdr10 file, but with washed-out colors... while my Huavei laptop, Ryzen 5 3500u, running Kubuntu, can play the same file just perfect (with vlc and Kodi), with HW acceleration and very nice colors? Why is that? why Rpi4 can not do it?

Does your TV support HDR and BT.2020?

If not that's expected as the RPi can't tonemap HDR videos to SDR which vlc on your laptop probably does.

so long,

Hias

I haven’t used a RPI4. However I have a JVC projector and a lumagen. The intel Nuc 12 works fine with HDR. However will not correctly output HDR10+ files. Also will not output 4k60 HDR content at the moment either.

I’m currently building a Ryzen system to compare.

Quote from HiassofT

Does your TV support HDR and BT.2020?

If not that's expected as the RPi can't tonemap HDR videos to SDR which vlc on your laptop probably does.

so long,

Hias

Yes. The TV is Philips 4K Android TV and with Kodi installed on it the same file plays just fine. Only the Rpi4 has problem.

Quote from ivobo

Yes. The TV is Philips 4K Android TV and with Kodi installed on it the same file plays just fine. Only the Rpi4 has problem.

Please provide a debug log, the output of modetest | pastebinit while playing a HDR file and mediainfo output of the file (mediainfo is available in the multimedia tools addon).

so long,

Hias