Here is my situation....
When burning lengthy files to VCD, the recorded picture degenerates progressively after about 10-15 minutes. It starts out with good quality that would be satisfactory if were maintained. The disks I have burned with music videos are very good beginning to end - but these are a series of 5 minute files. I have had success with ONE movie that was downloaded. I have had failures with all other movie downloads and movie captures. The source files have been both AVI and MPG and appear to be good quality when viewed full-screen on my PC.

I am capturing with VirtualDUB and burning with Nero 5.5.5.3 on an IOMega USB CDRW drive.

Thanks for any help!