I have the same problem now. My first cap was a 55-minute vacation movie (only thing on the tape). 29 dropped frames--all in the first minute--but clear sailing after that.
My second attempt was a series of home movies all on the same tape. About 4.5 hours worth. First 15 minutes started fine. At around the 15 minute mark, the video went away, but audio was still fine. Thousands of dropped frames in the next few minutes.
I've tried capturing as AVI in best, better, and good presets; same with MPEG1/2. Same issue. Plugged into front USB and back USB ports. Same issue. Started with Vista 32 SP1 machine and switched to XP Pro 32 SP3. Same issue. Uninstalled/reinstalled on Vista machine. Same issue. The mouse and keyboard are the only other USB devices.
I have not tried AMCap, but will now.
I do not currently have the miniDV option because I got rid of mine years ago. Converter boxes from component-to-firewire are not cheap and neither is buying another miniDV that I will only use for this. I only have about a dozen tapes (maybe 48 hours max) to move to DVD.
I believe this is a Pinnacle issue. The first 55-minute video capped fine. The first 15-minutes of the next tape capped fine. When I hit 'play' on the VCR, audio and video come across fine in the preview window. I've let it play for 30 minutes without capping to see if that would change and the feed was still fine. But once I start capturing...back to dropped frames and eventually locking up.
My Vista machine:
AMD Phenom 9550 (2.2 GHz)
Asus M3N-HT (nVidia 780a)
4GB Corsair 8500 dual-channel mode
1.5 TB across 2 drives (one O/S, one storage)
XFX GeForce 9800 GTX+ (512MB)
Vista Ultimate 32-bit SP1
The XP machine is almost the same, except it has an Intel Core 2 Duo, a 750i Asus mobo and an XFX 8800.
I'd really like to see if there is a fix.