Hi Noah Beney.
Sorry about my english… do you speak portuguese?
I´m with the same or like the same problem.
I´m shooting with a panasonic handycam that shoot in full HD with avchd codec, but i´m edting in adobe premiere CS4.
The problem is when I export the video in H.264 format. At any given time the image jumps, it is not happen all time, it is at just determined time.
After several attempts to export with different settings, I managed to solve the problem exporting to WMV in full hd.
This was the only way I could make it work and and I still do not know how to export in h.264 without the image jump.