OPTION 1

You can do make the files manually so that the television can work on your own vidoes, im sure you don't need help to figure it all out however if it seems complicated you can follow option 2 and it'll be much quicker and really depends on the circumstances.

OPTION 2

Option 1 was basically explaining that you can basically do it however you want, but for option 2 which are those who don't know how to make the television to function with their own videos. you can discord message me and i can help you create it for u, which all u need to do is install the mod in the thunderstore app which isn't too hard.