1. Dos based Windows. You get only some 32,768 frames in a file. Which works out to a little over 17 minutes.
2. FAT32 file system limit of 4GB per file. DV video capture could fill that in ... 17 minutes.
Sorry, but this forum is rarely visited, but the reasons, while well known can't be shared because you didn't tell what was asked when you posted. But maybe I guessed.
When I record from video it only records for 17 minutes, you then have to start again from that point.
It makes recording very slow. I've tried with 3 programmes & they all do the same.