Serviio

Before using serviio (or at least im workin on trying to use it) I used isedora. On that, it shows the devices that are on the network, and you can click on them and then just choose which files it can output. This would be a lot more user friendly, and increase compatability with a lot less work.

I don't necessarily think so. Once the profiles are properly defined, use will not have to do anything and files should just play. Most users don't know and don't want to know anything about file types.

On top of that, it's quite UI heavy I imagine and I'd prefer spending time on extending other features.

Another alternative to ensure support would just be to instead of having a playback to certain devices, have a universal "Avi" mode, and "MPEG", and "MP4" mode. You could choose these instead of choosing a specific device (although choosing the device could still be possible). This way people that do know the supported formats of their player could just choose the file type their player works with.