1773872 - Scrolling fps drops on youtube/twitch when video is playing and video HA enabled (Nvidia)

Status: RESOLVED INVALID

(Core :: Graphics: WebRender, defect)

Description

[randomreporter]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:103.0) Gecko/20100101 Firefox/103.0

Steps to reproduce:

Latest Nightly.
Create new profile, launch it
Make sure smooth scrolling is enabled (should be enabled by default):
Settings - General - "Browsing" section - Use smooth scrolling
Go to https://youtu.be/2q79M_32TFk?t=2104 or https://www.twitch.tv/videos/1500162784?t=01h44m33s
Launch video, change resolution to 1080p60, make sure video's playing
Start scrolling page down with your mouse wheel

I can't repro this bug on non-stream youtube videos and with media.hardware-video-decoding.enabled set to false

Actual results:

Scrolling is not smooth, scrolling fps drops considerably

Expected results:

Scrolling is smooth

Comment 1

[randomreporter]

Mayankleoboy1 from mozillazine helped me out a lot and found a similar bug! : https://bugzilla.mozilla.org/show_bug.cgi?id=1767185

The difference I see so far is that my bug is reproduced with VP9 and AVC, while STR for bug 1767185 involves VP9 only
My bug doesn't need pinch-zoom the page to make sure that the video fills the entirety of the screen
Bug 1767185 was reproduced on AMD, I use Nvidia

The only similarity I found is that my bug is not reproduced with gfx.webrender.dcomp-video-overlay-win = False just like bug 1767185

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::Audio/Video: Playback' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 3

[randomreporter]

Attachment: about_support.txt

Comment 4

[randomreporter]

Tried to record a performance profile but bug goes away as soon as I hit record button. I still recorded a profile but I doubt it is gonna be informative.
https://share.firefox.dev/39jYdUk

Comment 5

[randomreporter]

I can still reproduce this bug in latest Nightly (2022-08-08) despite bug 1767185 being fixed.

Comment 6

[NVD]

https://www.nvidia.com/download/driverResults.aspx/192967/en-us/

Does Nvidia GeForce 516.94 graphics driver fix anything?

Comment 7

[randomreporter]

(In reply to NVD from comment #6)

https://www.nvidia.com/download/driverResults.aspx/192967/en-us/

Does Nvidia GeForce 516.94 graphics driver fix anything?
No, it does not, I can still reproduce the bug with 516.94 driver in latest Nightly (2022-08-12), media.hardware-video-decoding.enabled still gets rid of the issue.

Comment 8

[randomreporter]

(In reply to NVD from comment #6)

https://www.nvidia.com/download/driverResults.aspx/192967/en-us/

Does Nvidia GeForce 516.94 graphics driver fix anything?

No, it does not, I can still reproduce the bug with 516.94 driver in latest Nightly (2022-08-12), media.hardware-video-decoding.enabled still gets rid of the issue.

Comment 9

[randomreporter]

Also, bug still goes away as soon as I start recording performance profile (F12 - Profiler - Start recording), once I stop the recording, bug still doesn't manifest itself.

Comment 10

[Mikel]

I am also expiriencing this bug with the latest nightly on YouTube videos that are 1080p+ 60fps.
Also, the higher the resolution of the video with 60fps, the more stutters are seen.
This has been the case a long time for me.

Comment 11

[Sotaro Ikeda [:sotaro]]

Hi randomreporter , can you check if the problem still happens with latest nightly? Thank you.

Comment 12

[randomreporter]

(In reply to Sotaro Ikeda [:sotaro] from comment #11)

Hi randomreporter , can you check if the problem still happens with latest nightly? Thank you.

I think it is safe to say I can no longer reproduce the bug in latest Nightly with latest drivers.

Comment 13

[Sotaro Ikeda [:sotaro]]

Great! Thank you.