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Questions about the hardware - HanaO00 - 2025-01-21

Hello, 

I am using Debian 12 on the host machine with an i5-12500, in the doc it says "these GPUs only work on Linux Kernel 6.2"

Is this also valid for containers? Knowing that you add the latest drivers etc.

I think Jellyfin is using hardware decoding but I'm not sure; there is some enabled in intel_gpu_top and this is in the logs
Code:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (h264_qsv))

Is this the option that must be activated to be able to transcode HDR to SDR?
[Image: hA0G3gS.png]

Do you know how many streams an i5-12500 can transcode in different situations?

1080p -> 1080p
4K SDR -> 1080p
4K HDR -> 1080p SDR

Thanks

RE: Questions about the hardware - TheDreadPirate - 2025-01-21

Containers share the kernel with the host OS. So if the host has kernel 6.2+, any containers running on the host will share that kernel.

I can't see that image at the moment, but "Tone mapping" and "VPP tone mapping" are the two settings you need to enable for HDR to SDR conversion during transcoding.

I can't remember if the 12500 has the same number of media engines as the 12100 in my system, but here were my results when I was testing with H264 as the output codec.

1080p -> 1080p - ~12 transcodes
4K SDR -> 1080p - ~12 transcodes
4K HDR -> 1080p SDR - ~2 transcodes

HDR to SDR tone mapping is very VRAM intensive, which is very limited and slow compared to a dedicated GPU.

The results may vary if the output of the transcodes are in HEVC. It has been a while since my iGPU was my transcoder.

RE: Questions about the hardware - HanaO00 - 2025-01-21

Thanks for your answer, the i5-12500 has a UHD770, so we can double the numbers you gave me?

For the moment I haven't had any problems with Jellyfin but would that mean that in reality Jellyfin uses software transcoding knowing that debian is in kernel 6.1?

RE: Questions about the hardware - TheDreadPirate - 2025-01-21

Alderlake needs 5.17+. So 6.1 should be fine.

Item #7 in this list.

https://jellyfin.org/docs/general/administration/hardware-acceleration/known-issues/#intel-on-linux

I'm not sure about double the numbers but probably close to it. Definitely not for HDR to SDR tone mapping since VRAM is the limitation.