I’ve figured out a bit more of what is going on.
The Dazzle 150 I’m using captures straight to MPEG-2 - no other options.
The VCR I’m playing on can advance frame-by-frame. All frames appear intact on a TV.
I can pass the frames from my VCR through my Dazzle and monitor the frames from inside my Pinnacle Studio software. Again, all frames appear intact - with or without a DPX-7000 in line.
They look poor, but viewable. There is some interference - distortion, ghosting, chroma problems. Definitely noticeable, but still watchable.
When I try to capture this though, Pinnacle Studio says no frames are dropped. Yet, when I look at the MPEGs there are frames that come through as black, or more seriously distorted than the source, or that look like they have swapped places with adjacent frames.
This happens with quality set for DVD, SVCD, or VCD.
Does this seem like the low quality of the source tape is overloading the ability of the Dazzle unit to do MPEG compression on the fly?
If so, what sort of capture unit/card should I use instead?