Is there any specific mtu or mss config for jellyfin?

[Idnawsi]

When i tried to play a video when on mobile data,  it just buffer endlessly. no transcode, and i check the speed from LTE to my home internet using wireguard vpn, speed is 50 to 80 mbps, video bitrate is 6mbps. Play locally is fine.

[TheDreadPirate]

Can you share your fully jellyfin logs with us? Giving us an approximate timestamp will help us search the log. Sanitize any WAN IPs and user names. Upload the log to pastebin and link it back here.

The operating system handles all the transport specifics. Jellyfin shouldn't care about any network configs as long as it is consistent.

Some things to look at:

1) Are VPN devices on a separate subnet? Is that subnet in the list of internal addresses?
2) If you don't want VPN devices to be considered "internal", do you have bit rate limit for external connections?
3) Do you have hardware accelerated transcoding setup? Related to #2, if you have a bit rate limit for external connections it may be transcoding very slowly.

[Idnawsi]

Can you share your fully jellyfin logs with us?  Giving us an approximate timestamp will help us search the log.  Sanitize any WAN IPs and user names.  Upload the log to pastebin and link it back here.

The operating system handles all the transport specifics.  Jellyfin shouldn't care about any network configs as long as it is consistent.

Some things to look at:

1)  Are VPN devices on a separate subnet?  Is that subnet in the list of internal addresses?
2)  If you don't want VPN devices to be considered "internal", do you have bit rate limit for external connections?
3)  Do you have hardware accelerated transcoding setup?  Related to #2, if you have a bit rate limit for external connections it may be transcoding very slowly.

here is the pastebin
https://pastebin.com/Xh0gtW8X

[TheDreadPirate]

I see a lot of transcoding for the external connections. What are your server specs? Hardware and operating system.

I also see Jellyfin Mobile as the phone client. Have you tried Swiftfin? Its a more up-to-date iOS client. Also, 10.8.11 is out and has some fixes. Both for bugs and for security issues.

Can you also share your ffmpeg log with us? Use https://sourceb.in/ instead of pastebin. Found out pastebin is blocked here at my work, so hard to follow up on these.