I have converted my .avi to .mpa and .m2v
Because i want to burn it on DVD.
I also want to “burn” .srt subs in de .m2v file.
How do i do that?

You have to either convert .srt to a compatible format for dvd authoring software or hardsub (encode the subs into the videostream).

is there software to convert .srt to DVD subs?
So that can select if i want to see the subs? --> Download --> Subtitles --> Show all subtitles tools