Waterfox: Youtube 4k quality option not showing up with Waterfox

[Kherby]

I'm using Waterfox 56.2.2 64-bit on my Win 10 machine.
I really like the performance compared to my old Firefox ESR 52.x but for some reason there is no more Youtube 4K content showing up ? 1080p is the highest option i can choose...

Is there any way to fix this or is Waterfox simply not compatible with youtube 4k contents ?

[Kherby]

Nvm, i've fixed it...
media.mediasource.webm.enabled was set to false, setting it to true did the trick and now the 4k quality option is showing up!

[jbeich]

Waterfox won't offer 4K on YouTube if VP9 decoding is slower than H.264, see
https://github.com/MrAlex94/Waterfox/blob/715e79f8f87e9f96e4a26f92ee02c8aec0c3b4e6/dom/media/mediasource/MediaSource.cpp#L86
Windows has VP9 acceleration since 788c9353ccb7, so it shouldn't happen unless your GPU is blacklisted, media.benchmark.vp9.fps is out of date, etc.

[Kherby]

Sorry but i dont understand this at all... my gpu is Intel HD620.
media.benchmark.vp9.fps 143
After setting media.mediasource.webm.enabled > true 4k is showing up and working fine. (vp9 (313) / opus (251)
Maybe my config is messed up from using Firefox ESR 52 before... I've imported bookmarks, settings aso after the first start of Waterfox...
Could this be the problem?

[jbeich]

media.benchmark.vp9.fps=143

What's the value in Firefox? Waterfox disables WebM for media.mediasource.webm.enabled=false because of media.benchmark.vp9.threshold=150.

Note, in Firefox ESR52 VP9 hardware decoding is disabled by default. I wonder how it affects the benchmark.
https://github.com/mozilla/gecko-dev/blob/esr52/modules/libpref/init/all.js#L356

[Kherby]

media.benchmark.vp9.fps=156 in FF ESR52
media.mediasource.webm.enabled=false is standart in FF ESR52
media.wmf.vp9.enabled=true is standard in Waterfox 56.2.2 and false in FF ESR52.

It is realy weird. Is there a safe way to load the default config/settings for Waterfox without deleting my Bookmarks, Passwords aso ? I find it kinda strange that 4k playback (vp9) on youtube isn't supported with the default config...
I dont need Firefox ESR52 anymore but i haven't uninstalled it yet because i first wanted to make sure that Waterfox is running fine.

Btw, Firefox ESR52 was causing a CPU load of ~66% with youtube @4k while Waterfox and ungoogled Chromium is only showing a CPU load of ~13% at the same 4k video (i guess because of media.wmf.vp9.enabled=false)!!
CPU: i5 7200U (the cpu is undervolted (Core voltage offset -0,090v) so it holds the 3.1GHz Turbo boost all the time)
Driver Intel HD620: 23.20.16.4973 (undervolted -0,080v)
OS: Win 10 x64, 1803

Oh and another thing i noticed is that Watferfox doesn't show any statistik for dropped frames at youtube 4k (right click > statistics for nerds).
edit: https://imgur.com/e6rhwe2

I think that my config is somehow screwed up... :/

[Kherby]

So i did a backup of my passwords and bookmarks and uninstalled firefox ESR52 and also deleted the profiles in AppData.
Then i uninstalled Waterfox and also deleted profiles and reinstalled it...

Now youtube 4k option is showing out of the box my the high CPU load is back, ~70% when watching a 4k video at youtube!! :/

How can i fix this ?

media.wmf.vp9.enabled;true
media.benchmark.vp9.threshold;150
media.mediasource.webm.enabled;true (changed this)

I really don't understand this why the high CPU load is back again... It's so freaking weird!
Please help me, i want to use Waterfox as my main browser and watch 4k youtube without having my CPU running at 70%...

edit: It seems that GPU0 - Video Decode isn't used anymore and that's why the cpu load is so high once again... For example chromium is using GP0 - Video Decode when watching 4k at youtube.
It was working fine with Waterfox before, i don't understand why its not used anymore with a fresh install and profile!
How can i tell Watferfox to use GPU Video Decode again?

[Kherby]

Okay so it seems that media.hardware-video-decoding.failed=true is responsible for the high CPU load!
I wonder why it is set to true on a fresh install? I've set it to false and high CPU load is gone...
My GPU does support hardware-video-decoding so why was it set to true and why it didn't happen with my last installation (same version)?
Imho there is clearly something wrong with the detection...

[grahamperrin]

For what it's worth,

about:config?filter=media.hardware-video-decoding.failed

• finds nothing (no boolean) with Firefox 61.0.1 or Waterfox 56.2.2 on FreeBSD-CURRENT on an HP EliteBook 8570p

… undervolted …

Is the issue reproducible without under-volting?

… something wrong with the detection …

Troubleshooting information, please. Use the Copy text to clipboard button at about:support

… Is there a safe way to load the default config/settings for Waterfox without deleting my Bookmarks, Passwords aso ? …

about:support ▶ Try safe mode

[Kherby]

I've tried everything without undervolting and it was the same. The high ram usage also returned today with only 3 active tabs... (https://github.com/MrAlex94/Waterfox/issues/711)
I'm think that i'll give up on Waterfox for now as i don't know how to debug these kind of problems and i need a "stable" browser for my daily usage that works fine out of the box.

Application Basics

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Version: 56.2.2
Build ID: 20180712180347
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OS: Windows_NT 10.0
Multiprocess Windows: 1/1 (Enabled by user)
Web Content Processes: 2/1
Stylo: false (disabled by default)
Google Key: Missing
Mozilla Location Service Key: Missing
Safe Mode: false

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[grahamperrin]

imgur.com/e6rhwe2

In the screenshot:

• Breathtaking Colors of Nature in 4K III 🐦Beautiful Nature - Sleep Relax Music 4K UHD TV Screensaver - YouTube

[grahamperrin]

Cross reference: https://www.reddit.com/r/waterfox/comments/deuzev/-/f31pz23/?context=1 under a post for Waterfox 68.0b1.

Can anyone with 4k capability tell whether this issue is reproducible with Waterfox Current?