How can I force transcoding?

[TheDreadPirate]

Depends on the client. The desktop JMP, browser, and, I think, Android phone clients let you select the quality (resolution and bit rate). Just set it to something lower then the media's native bit rate and it should trigger transcoding.

You could also set the "LAN networks" setting to something that is not whatever your current LAN is and jellyfin will treat connections as remote. But you have to check the box to enable remote connections even if you aren't opening it to the actual Internet.

For example, if your actual LAN is 192.168.1.0/24, you would set the "LAN networks" field to 192.168.150.0/24. A valid setting, but would result in treating all actual LAN connections as remote. And the Internet bit rate limit setting would apply to them.