It's the ffmpeg version that emby uses vs the one plex uses. Plus, correct me if I'm wrong but I thought plex just reports it is using HW accel and not specifically which one and I don't think it works well in a docker, as I walked a user through the process on linuxsever.io's IRC channel and he was able to do it but it's a lot of work and too many moving parts to get it not to collide with the base os or other containers. I will ask the user.if anything has changed for plex, but I doubt it.
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