Welcome to the forum
You want to burn your .avi file to a DVD-compliant disc, so it plays on a regular player, yes?
There are a couple of options I can recommend - first is the option I use myself, ConvertXtoDVD - this isn’t free software, though.
The second is DVDFlick, which is free.
Hopefully you’re using quality discs, and if you burn at 8x - 12x you should get a working DVD from one of the two