1727490 - firefox's colours washed out in videos

Status: RESOLVED DUPLICATE of bug 1726186

(Core :: Audio/Video: Playback, defect)

Description

[Leo_sk]

Attachment: Comparison of video playing on firefox nightly and vicaldi

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:93.0) Gecko/20100101 Firefox/93.0

Steps to reproduce:

1. Open youtube.com
2. Play a video

Actual results:

Colours appear washed out. It feels like contrast is lowered

Expected results:

Video should display correctly.

I tried changing values of various gfx.colour* variables but did not improve anything

Comment 1

[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 revert this change in case you think the bot is wrong.

Comment 2

[Leo_sk]

https://www.youtube.com/watch?v=JeQuelXsUYA

A better video for testing. The blacks appear as dark grey and whites are a shade of light grey. All other colours are also duller compared to output from vlc or chrome

Comment 3

[Jon Bauman [:jbauman:]]

Attachment: Monitor Color Test _ Monitor-Farbtest (RGB_CMYK) (1080p)-JeQuelXsUYA.mp4

In my own tests on macOS 11.4 (20F71) Firefox looks closer to VLC on this content than Chrome. Checking the green (0:12) section, the sRGB values with the Digital Color Meter app, I'm seeing

External display:
Firefox: 0, 215, 0
VLC: 0, 217, 0
Chrome: 1, 255, 0

Laptop display:
Firefox: 4, 215, 2
VLC: 0, 221, 0
Chrome: 0, 255, 0

Jeff, I know you've been looking at this sort of stuff recently. Do you have any thoughts?

There doesn't appear to be anything particularly strange about the video. I've attached the version I'm testing in VLC. It's BT.709 limited range.

Comment 4

[Leo_sk]

Just an addition, problem does not occur without hardware accelerated decoding enabled

Comment 5

[Kelsey Gilbert [:jgilbert]]

This might be bug 1726186.

Comment 6

[Kelsey Gilbert [:jgilbert]]

Please attach the graphics part of your about:support.

Comment 7

[Leo_sk]

Attachment: about:config/graphics

(In reply to Jeff Gilbert [:jgilbert] from comment #6)
> Please attach the graphics part of your about:support.

Comment 8

[Leo_sk]

Attachment: about:config_graphics

(In reply to Jeff Gilbert [:jgilbert] from comment #6)
> Please attach the graphics part of your about:support.

Comment 9

[Leo_sk]

Attachment: about config graphics

(In reply to Jeff Gilbert [:jgilbert] from comment #6)
> Please attach the graphics part of your about:support.

Comment 10

[John Lin [:jhlin][:jolin]]

Jeff, could you please have a look at the gfx info and confirm this bug is the same as bug 1726186 or not? Thanks a lot!

Comment 11

[Kelsey Gilbert [:jgilbert]]

I can't tell.

Comment 12

[Alastor Wu [:alwu][PTO 11/1-11/9]]

Because some people think this might be related with bug 1726186, would you mind to check whether the issue still exists if you turn off the pref media.ffmpeg.vaapi.enabled? Thank you.

Comment 13

[Leo_sk]

(In reply to Alastor Wu [:alwu] from comment #12)

Because some people think this might be related with bug 1726186, would you mind to check whether the issue still exists if you turn off the pref media.ffmpeg.vaapi.enabled? Thank you.

It does not exist when hardware acceleration is disabled. It might be same as bug 1726186

Comment 14

[Alastor Wu [:alwu][PTO 11/1-11/9]]

Thanks for verifying that!