Could you try to edit the file with VideoReDo and see if it manages to fix enough of those problems to make the file playable?
I just did some tests with VideoReDo and... well... no joy.
I must admit that VideoReDo did a pretty good job at fixing minor glitches in the stream. After using the "QuickStream Fix", no more MPEG artifacts (random colored blocks) were visible but they were replace by duplicated frames. It was OK on minor errors but very apparent where there was more corruption in the stream.
So, for now, I'll just wait and see if anybody reports a successful capture using the 8300HD. If the problem is not related to software and/or PC, I'm sure you can imagine what I think of Scientific Atlanta right now...