SOLVED: Most compatible container and format

[TheDreadPirate]

I have a file with the exact same codecs and containers. When I disable transcoding and only allow remuxing it remuxes correctly into a MP4 instead of .MOV like yours does. I think the reason it takes so long to start is because .MOV doesn't support segmentation so you have to wait for the remux to fully complete before it starts.

Let's try rebuilding the docker container.

Code:

sudo docker compose down jellyfin
sudo docker system prune -a
sudo docker compose up -d jellyfin

We are stopping Jellyfin, then pruning the virtual file system it creates and the image. This does NOT delete your permanent config files or media. Then starting jellyfin again. It will re-pull the image and rebuild the container.