8K HDR content on youtube is lagging with a very capeble CPU (13900K)

[Dirt Chip]

All cores/threads are 100% utilise, temp is in reasonable range (75-85C) and the video presented is far from being fluid, no other job other than playing youtube is done.
Anyone else having that 'issue' with 'top tire' CPU`s or is it 'just the way it is'?
See reference video:

 

[Marcus L]

Wouldn't hardware acceleration be better than the CPU IE GPU rendering, should usually be enabled by default though depending on your browser you may need to enable it, I don't think current consumer CPU are capable of anything above 4k even then you will get stutter and frame drops, this is just my personal take as I don't have a 4k monitor though have played around with 4k yt on the odd occasion from a nerd pov and this was my observation, you can also try changing the codec in YouTube settings though it may need to use a single particular one for anything 4k and above, am happy to be corrected and educated if anything I've said is incorrect.

 

[Thimblewad]

What browser are you using? Youtube favors Chrome and mostly runs like sh*t on everything else.

 

[Solaris17]

Video encode and decode is incredibly expensive and any modern codec is going to run like absolute garbage on any CPU. It needs hardware offload to the GPU. Can your GPU even support hardware offload of that resolution? Most cannot.

 

[Dirt Chip]

What browser are you using? Youtube favors Chrome and mostly runs like sh*t on everything else.

is using crome

Video encode and decode is incredibly expensive and any modern codec is going to run like absolute garbage on any CPU. It needs hardware offload to the GPU. Can your GPU even support hardware offload of that resolution? Most cannot.

My aging 1080TI probably don't have that silver-bullet if even the 5090 dont have it..

 

[Jimster480]

Decoding 8K will not work even on most modern CPU's.... the codecs today are extremely powerful.
Nvidia typically lags behind AMD in this fashion though as 8K decoding has been supported since Navi came out (RDNA)..

Video Core Next - Wikipedia

en.wikipedia.org

Most AMD GPU's from the last 6 years can also even encode 8K... just not with AV1; that is for RX 7000 series.

IT doesn't help that for OP you have a 1080Ti which doesn't support HEVC (4:4:4 which is required for HDR) or AV1 Encoding or Decoding.

Nvidia NVDEC - Wikipedia

en.wikipedia.org

 

[Youseethis]

Your igpu uhd770 can do AV1 8K.

AV1 decoding:
Intel Xe 12th gen, Intel Arc A and B series.
Amd 6000 series (up to 4K) and amd 7000 series. (edit: rx 6500 xt and rx 6400 do not support av1)
Nvidia Ampere (3000 series) and up.

I don't think 8K works through DXVA 2 (direct3d 9) instead Direct3d 11 video is used now in chrome (I might be wrong). If you plan to upgrade avoid Blackwell cards (rtx 5000) for now because direct3d 11 video rendering seems to be broken on them causing green and red artifacts (at least on windows 11 24h2) (dxva 2 works though).

 

[R-T-B]

4:4:4 which is required for HDR

No, it's not. If it was no AMD GPU could decode it as no AMD GPU supports chroma 4:4:4 decode, lol. The idea that AMD leads the gpu codec race in any capacity is furthermore quite a pipedream. It does in 8K I guess, but that's it. That's really interesting actually... I didn't know they had a lead in ANY capacity. Surprised nvidia let that one slip away!

AMD isn't bad for most uses mind, but stuff like chroma 444 just is broken or unsupported outright.

Your igpu uhd770 can do AV1 8K.

This is his answer.

He should make sure gpu decode is enabled in his browser, and his igpu is enabled.