[Solved] Issues with Jellyfin playback in Firefox

[Infernal_pizza]

I'm having trouble playing some video files in Firefox. There's a particular one which will skip the first couple of seconds, play a couple of seconds and then just freeze.

Its not an issue with the video file or my Jellyfin server because it plays fine under my Arch install, it's only Gentoo where I'm having problems. The playback info says it's H264 AAC. I'm using Firefox-bin:rapid so there are no USE flags to change there, but I did make sure ffmpeg was built with the x264 and x265 USE flags, and I understand it supports AAC anyway. I also enabled x264 and x265 in make.conf and updated the world set.

[Infernal_pizza]

This appears to be an upstream bug in Firefox 1.49. Lower versions do not have that issue, and I just updated Firefox on my Arch install and am now having the same issue