Im trying to burn off a few movies onto blank disc,but when i do it nothing will play on my DVD.?

I am doing exactly the same as when i do my audio CDs,and they turn out perfect.I download the movie,open it and then burn it off through my burning software.But when i put it in my DVD player it says on screen:THIS TYPE OF DISC CANNOT BE PLAYED ,PLEASE USE ANOTHER.Now is that because thers nothing on the disc,or the player just wont play the disc.Using VERBATIM dvd discs.But i have a load of cheep snide discs with films on and it plays them.Is there another process to burning movies to burning audio?Coz as i say,audio turns out 100%.Any info would be cool.Any joy with explaining step by step how to use vista codec pack too?Got it but dont know what to do.