Nero vision 4 encoding has expired

Hey ive been tring to make a dvd video with my mp4 files

but nero says my mpeg 4 encoding has expired and wont let me add the clips

is there any solution to this? (other then buying the encoding thing)

 

use a different program such as FAVC?

 

ok ive just tried using favc

but i get this error after converting when imgburn opens up

"first image file part is less than 2048 bytes"

and the iso it produced seems to be 0kb

any solutions?