2023-09-11, 02:00 AM
Your video is transcoding in jellyfin, but probably not in Plex. This is a client side issue since the client tells the server to transcode and how to transcode. You mentioned Chrome and Safari in MacOS. Have you tried Jellyfin Media Player? The standalone desktop app has better codec support than the Jellyfin web client. And it should play the video without transcoding.
https://github.com/jellyfin/jellyfin-med...r/releases
https://github.com/jellyfin/jellyfin-med...arized.dmg
https://github.com/jellyfin/jellyfin-med...r/releases
https://github.com/jellyfin/jellyfin-med...arized.dmg