i have downloaded a number of divx avi files which i try to convert to dvd format with TMPGenc

the program if telling me that the file running time is 3 times longer than it actually is, and when i goto edit the source to only encode a certain number of frames as the final 2 thirds is just blank, no display, nothing, i get no sound in the audio waveform. i have tried encoding it, and even though i get perfect video, and the correct duration, i get no sound

anyone know why and how i can get it to work properly

thank you