[Bibio]

i'm getting a bit confused here so a few questions.

are you editing the mp4 so it has chapter and navigation using editing software?
if you are doing as above what format are you saving your 'project' as e.g. mp4, mkv, xvid etc.etc?

most modern dvd/bluray/tv's have a usb port that you can play files from and they usually support mp4, mkv etc.etc.
does your dvd/bluray/tv have a usb port?

btw never ever use your original file to edit always use a copy that way if you mess up you still have the original to copy again.