Could it be the encoding?? Burned DVD -R's always freeze about half-way... please help

Hey, I have been burning a lot of dvd's lately by taking an avi video using "MainConcept MPEG Encoder" to convert it to dvd format, ... then I have "DVD-lab PRO " to mix it into Video_TS and stuff. I then burn the dvd in "DVD-lab PRO ". I play back the movies on my dvd player and they always work fine for about the first half (about somwhere around there) Then there will be a frozen video picture and the audio will keep on going and the video Stops. I am using Fujifilm DVD -R's along with a ORITRON DVD Player (can play all types of burned media). It would be much appreciated if you could help me. Thanks a lot
-Pat (redhatman)