How to get videos to play COSMIC Atomic

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1

Is there something I have to install to get videos to play properly on the X page in Firefox? I’m using COSMIC Atomic 42.

Screenshot_2025-08-16_17-29-43
Screenshot_2025-08-16_17-29-43452×356 7.59 KB

2

Never used Cosmic, but if it comes with Firefox installed by default, then you need to install the codecs via RPM Fusion. Personally on Silverblue / Kinoite, I install Firefox from Flathub, which supersedes the default Firefox and then install the ffmpeg flatpak package. It’s simpler and the Firefox from Flatpak comes with all the codecs, while I believe Firefox flatpak from Fedora faces the same problem as Fedora in general, they can’t bundle stuff in the Flatpak they can’t bundle in regular Firefox.

3

I got the repositories installed but when I tried to install ffmpeg I got this:

hecking out tree 0ddf8a6... done
Enabled rpm-md repositories: fedora-cisco-openh264 updates fedora rpmfusion-free-updates rpmfusion-free rpmfusion-nonfree-updates rpmfusion-nonfree updates-archive
Importing rpm-md... done
rpm-md repo 'fedora-cisco-openh264' (cached); generated: 2025-03-19T16:53:39Z solvables: 6
rpm-md repo 'updates' (cached); generated: 2025-08-16T01:06:55Z solvables: 21984
rpm-md repo 'fedora' (cached); generated: 2025-04-09T11:06:59Z solvables: 76879
rpm-md repo 'rpmfusion-free-updates' (cached); generated: 2025-08-13T21:55:23Z solvables: 84
rpm-md repo 'rpmfusion-free' (cached); generated: 2025-04-12T09:12:27Z solvables: 358
rpm-md repo 'rpmfusion-nonfree-updates' (cached); generated: 2025-08-13T22:19:26Z solvables: 59
rpm-md repo 'rpmfusion-nonfree' (cached); generated: 2025-04-12T09:32:45Z solvables: 218
rpm-md repo 'updates-archive' (cached); generated: 2025-08-16T02:18:24Z solvables: 35570
Resolving dependencies... done
error: Could not depsolve transaction; 1 problem detected:
 Problem: conflicting requests
  - package ffmpeg-7.1.1-6.fc42.x86_64 from rpmfusion-free-updates conflicts with ffmpeg-free provided by ffmpeg-free-7.1.1-4.fc42.x86_64 from @System
  - package ffmpeg-7.1.1-5.fc42.x86_64 from rpmfusion-free conflicts with ffmpeg-free provided by ffmpeg-free-7.1.1-4.fc42.x86_64 from @System
4

Did you read the HowTo section for Multimedia here?

Edit: Forgot to add the link to the OSTree HowTo as well.

5

You can also try installing libavcodec-freeworld from the RPM-Fusion repos, in case you want to stick with Firefox package from the base install:

rpm-ostree install libavcodec-freeworld
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7

That did the trick. Thanks.

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