Chrome Youtube 2160p60 HDR stutter / lag

Stiffler05

Stiffler05

Stiffler05

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13 Jul 2005
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Hi guys,

Just recently got a new TV (Sony xe9005) and have been playing around with HDR content.
Everything has been great - Ps4 pro, pc games in 4k60 hdr, iplayer, 4k HDR movies.

However, when using my PC connected via a high speed hdmi cable (which works fine with games and movies at 4k hdr) Chrome YouTube in 4k60 HDR stutters really badly and runs at a low frame rate between stutters. 1440p is fine and 4k HDR at 24/30 fps is fine too.
I have a good system, ryzen 5 1600, 16gb 3200mhz ram and a GTX 1080 so I think it should be able to handle it fine. Drivers are all up to date, as is Windows.
Anyone else experienced this issue? Or can think of a potential fix?

Thanks, Steve.
 
jpaul said:
download the utube material and try playing locally with vlc/mpc-hc, which may isolate if the browser, or BB/wireless is creating the problem,
does it play on the tv's app ?
Click to expand...

The TV YouTube app doesn't support hdr, so can't use that as a comparison unfortunately. 4k60 is fine in the TV app though.

I've downloaded some LG hdr test videos which I've played in vlc. Codec info says it's 2160p at 60fps and the TV is displaying a hdr logo, so I think it's working, it certainly looks hdr! I imagine that'll be as good as downloading the YouTube vids won't it?

It's not a connection speed issue because the videos are lagging behind the buffer progress bar in YouTube.
 
I'm on Windows build 1803.

Gpu acceleration is flagged as on in the chrome settings. If I remember correctly the cpu usage during the 4k60 hdr youtube vids was approx 50% and Gpu was very low at about 15%.
 
chrcoluk said:
Something doesnt seem right 50% cpu seems high if its GPU accelerated.

Play a video whilst gpuz is running and check if video decode load is higher than 0%, if its at 0% then gpu acceleration is not working.
Click to expand...

Is that called video engine load? Cause that stays at 0. Bus interface load rises slightly to about 8%.

This is my chrome gpu flags:

  • Canvas: Hardware accelerated
  • Flash: Hardware accelerated
  • Flash Stage3D: Hardware accelerated
  • Flash Stage3D Baseline profile: Hardware accelerated
  • Compositing: Hardware accelerated
  • Multiple Raster Threads: Enabled
  • Native GpuMemoryBuffers: Software only. Hardware acceleration disabled
  • Out-of-process Rasterization: Disabled
  • Hardware Protected Video Decode: Hardware accelerated
  • Rasterization: Hardware accelerated
  • Skia Deferred Display List: Disabled
  • Skia Renderer: Disabled
  • Surface Synchronization: Enabled
  • Video Decode: Hardware accelerated
  • Viz Service Display Compositor: Disabled
  • WebGL: Hardware accelerated
  • WebGL2: Hardware accelerated
 
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jpaul said:
maybe - you may find some vp9l2 codec examples here https://kodi.wiki/view/Samples, that could be more challenging for the gpu...
i think you can open them in chrome too (with hdr examples you already have too), as well as playing with vlc/mpc
Click to expand...
The VP9 vid world in HDR works flawlessly in vlc. I don't know how to open it in chrome. However, looks like it must be hardware acceleration issues in chrome.
 
chrcoluk said:
yep video engine load, so the gpu offloading is not working. If you scroll down the chrome gpu screen is there any notes about
  • disable_accelerated_vpx_decode
Should be under driver bug workarounds if it is there.

From what I understand but never checked, microsoft EDGE will use h264 for 4k youtube videos. Which means it will use far less cpu.
Click to expand...
No, there's no mention of that in the chrome Gpu info.

Edge won't play hdr videos. Or at least I can't get them to work as they do in YouTube.

I'm not sure how to resolve this issue. Been playing around in chrome flags trying to enable some of the things which are reported as disabled in the gpu page, but nothing has helped.
 
If i play a YouTube video at 4k60 the gpu assists with the processing and the 'video engine load' in gpu-z goes up. As soon as I change it to HDR (4k60), the video engine load no longer goes up and the video will drop frames and lag. So it must be the hdr which is causing the issue in chrome Youtube. Any thoughts?
 
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I think it's the youtube VP9 10bit content which my gtx 1080 can't decode, so it's going into software mode and my ryzen 5 is struggling to process a 4k60 video.

Got to say I'm surprised that a 1080 can't do vp9 10bit. Its such a powerful card, I just assumed it would be able to do it.
 
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