Arch Linux

SimonJ

Member

From: Spain

Registered: 2021-05-11

Posts: 361

Website

[SOLVED] Librewolf cannot play video

As of today I am getting this error in Librewolf for many videos

This video can’t be played on your device. 

Your browser or system may be missing the required video codecs (H.264/AAC).

It started after an update yesterday which included ffmpeg, so I am guessing Librewolf needs an update to match this? Is this correct or did I break something myself?
pacman.log

[2026-08-07T09:59:35+0200] [ALPM] upgraded nvidia-utils (610.43.03-5 -> 610.57.04-1)
[2026-08-07T09:59:35+0200] [ALPM] upgraded lib32-nvidia-utils (610.43.03-1 -> 610.57.04-1)
[2026-08-07T09:59:37+0200] [ALPM] upgraded nvidia-open-dkms (610.43.03-5 -> 610.57.04-1)
[2026-08-07T09:59:37+0200] [ALPM] upgraded nvidia-settings (610.43.03-1 -> 610.57.04-1)
[2026-08-07T21:44:39+0200] [ALPM] upgraded ffmpeg (2:8.1.2-11 -> 2:9.0-5)
[2026-08-07T21:44:40+0200] [ALPM] upgraded qt6-multimedia-ffmpeg (6.11.1-1 -> 6.11.1-2)

Librewolf is up to date also

local/librewolf 153.0.3_1-1
    Community-maintained fork of Firefox, focused on privacy, security and freedom

Last edited by SimonJ (2026-08-08 09:52:37)

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Rlu: 222126

Horacio

Member

Registered: 2026-08-08

Posts: 1

Re: [SOLVED] Librewolf cannot play video

Yes, it’s an issue from update. Firefox already has a patch, so a fix will probably arrive soon.
In the meantime, you can install  ffmpeg4.4, which should also work.

SimonJ

Member

From: Spain

Registered: 2021-05-11

Posts: 361

Website

Re: [SOLVED] Librewolf cannot play video

Yes, it’s an issue from update. Firefox already has a patch, so a fix will probably arrive soon.
In the meantime, you can install  ffmpeg4.4, which should also work.

This has worked, thank you. I will note to remove it when the Librewolf update arrives.

The update arrived and now it is solved without the extra ffmpeg package

librewolf 153.0.3_1-2

Last edited by SimonJ (2026-08-08 11:41:02)

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Rlu: 222126