Jean-Yves wants to uplift all ffmpeg-related changes to 43 and enable H.264 MSE on Linux.

I would (as a user) like this, but I don't have good context on any of the risks involved.

Tracking this since it's part of a feature aimed for 43.

Release Note Request (optional, but appreciated) [Why is this notable]: New feature for our GNU/Linux users [Suggested wording]: H264 decoding available from the MSE API (GNU/Linux) [Links (documentation, blog post, etc)]:

Jean-Yves - can we mark this as fixed?

this is fixed by bug 1213173 and others

Should this be noted for 43 or for 44? I just realized bug 1213173 is only fixed on 44.

It should be in 43 too. I believe the fix went on there too (will confirm) We will have to get 1219134 fixed and uplifted too.

Release Note Request (optional, but appreciated) [Why is this notable]: This change will allow Linux users to play H.264 video, which is a pretty big deal. This issue was fixed in 44 but uplifted to 43. I made bug 1219134 block this bug because Jean-Yves said (in comment 7) that fix must be uplifted to 43. [Suggested wording]: Enable H.264 on Linux when FFmpeg is available. [Links (documentation, blog post, etc)]:

Is this now fixed for 43 and 44? Or are there still some cleanup bugs coming? If it's done now then can you mark the status for 43 and 44 ? Thanks :)

Added to Beta44 release notes.

Wording updated to "Enable H.264 if system decoder is available"