is there a way to save the transcoding files?

[thenamelessthing]

is there a way to automaticly save the transcoding output for futur use?

[NX3]

You could convert them yourself using e.g handbrake then Serviio won't need too

[Illico]

I think you want to export the temporary transcoded file to a record folder, isn't it ?

[thenamelessthing]

Exactly!