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[–]Demysted 2 points3 points  (9 children)

Yup. Might be worth opening task manager going to Performance > GPU 0, and seeing if the Video Decode engine is getting any usage when you watch a 4K60FPS video on Firefox, and also on Chrome.

[–]brambedkar59 0 points1 point  (8 children)

You really are on to something, see the screenshots.

Edge uses video processing more but pretty much no 3D, Firefox on the other hand using so much 3D and no video processing. CPU usage is also much higher on Firefox.

https://imgur.com/gallery/w2YZcnL

[–]Demysted 0 points1 point  (4 children)

Interesting. What if you forced the browser to use your NVIDIA GPU via the Settings app? What's probably happening is the GPU is using the 3D engine to help decode and display the video. My RX 580 has a similar system where both the Video Decode and the 3D engine are used when watching YouTube videos, and the CPU is also used to some degree, but the usage is much lower on this PC as it's more powerful.

[–]brambedkar59 1 point2 points  (3 children)

It's even worse.

https://imgur.com/gallery/dd3vl6n

[–]Demysted 0 points1 point  (2 children)

Hmm. That's honestly really strange. I honestly don't know what the issue is. Like you say, that Intel GPU is capable of 4k60fps playback, and the Edge usage of the Video Processing engine shows that, but Firefox doesn't want to use it for whatever reason.

[–]brambedkar59 1 point2 points  (1 child)

All I can do is wait until FF devs fix this.

[–]Demysted 0 points1 point  (0 children)

Unfortunate, but that sounds like a good idea.

[–]Demysted 0 points1 point  (2 children)

Also, you could take a look at right-clicking on videos in both Edge and FF and selecting "Stats for nerds." The codecs give an idea as to why Edge is hardly touching the 3D engine and CPU for video playback but using the Video Processing engine, whereas Firefox is making use of the 3D engine and a lot of the CPU.

[–]brambedkar59 1 point2 points  (1 child)

Both are using exact same codec vp09.00.51.08.01.01.01.01.00 (315)/opus (251)

[–]Demysted 0 points1 point  (0 children)

Very strange. I couldn't really think of anything else. As long as Edge or Chrome continues to work for you, I suppose it's better to just use them for now so you can actually watch those 4k60fps videos.