Doesn't play videos on external access in browser

[TheDreadPirate]

Those are ffmpeg logs. And they look fine.

For what you are asking for, sharing a link that anyone can just play, that is not possible unless the remote user pasting the link in MPV or VLC or <insert video player>. It will never work in the browser since the link is just a download link. Jellyfin does not allow access to the web player without authentication.

Additionally, the link you provide these other users includes an API key. Otherwise the download link wouldn't work, since Jellyfin requires authentication. Once you log out of your session that create the link, the API key in that link becomes invalid. So it won't stay valid forever.

This is also a security issue. Unauthenticated video sharing is not a supported use case for Jellyfin. A malicious person could use the API key included in your link to gain unauthorized access to your Jellyfin server. If this API key is for an admin user, they can make changes and delete content if they wanted to.