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So I just discovered that proprietary media (H.264, AAC, etc.) was not working with the Snap version of @Vivaldi on Linux—I mean .snap packages, not Snapshots.

I found this out as I attempted to use the Snap version to play a video and it failed. I am on vacation at the moment and not really monitoring our forums or bug tracker right now. I addition I do not usually use the Snap at home personally, so this was just by chance.

On investigating, it seems that on 2024-12-17T13:39:10.926512+00:00 (last Tuesday) the "chromium-ffmpeg" snap package that we use to provide support for proprietary media was updated by Canonical and version 115541 (which we were still using) was removed entirely.

Since I can update things myself and most of my colleagues are likely asleep I have now switched the Vivaldi 7.0 Snap to use "chromium-ffmpeg-118887" (which Canonical offer now) and released this live as of 2024-12-23T00:03:01.156148+00:00. That seems to have resolved it for me. If anyone is using the Snap version of Vivaldi, could you also confirm (after a Snap refresh and a restart of the browser) that it works for you also.

There is a test video (with sound) here for you to check against:

https://help.vivaldi.com/desktop/media/html5-proprietary-media-on-linux/