I've been transferring my family's home movies (video8 to my mac via passthrough using a sony dv cam. The captured footage from some of the tapes blacks out or goes staticy every few seconds. When these tapes are viewed on the 8mm camcorder's viewfinder, the footage plays perfectly. I tried hooking the camcorder up to my tv via av cables, and it also blacks out or goes staticy every few seconds. This has only happened with a few tapes (all Sony brand). At first I thought the tapes were just old and overplayed, but how does that explain them playing perfectly on the viewfinder? Any help would be greatly appreciated!

Thanks,
Jeff