THANKS FOR THIS POST!! I have had this same problem on occasion. A favorite (rented) Windows XP PC that I'd used for 2 years suddenly developed this "jerkiness" after it had been re-formatted (due to a virus attack).
I thought it was because a competing video program (such as Graboid) had been installed.
Think the capacity of the computer is 500 Gb.
Yes,MPEG is the "right" setting. Huffnayev itself produces jerkiness.....Also,sometimes I deliberately record the minimized (small screen) versions of videos. That works better. Sometimes I have to use a jumper audio cable (from speaker output to microphone input) to achieve audio....but that apparently has been fixed.
Note that sometimes,the file has to be re-processed via NCH VideoPad VideoEditor. Use the "smoothness" panel to add detail to the video. (Setting can be +5 or +10 - with original scale of "50")
DEBUT is a lifesaver and it was worth the $40 license fee. It's quite unique. I also use it to record images of files (as a record of what I have on cruzer USB's,etc.) Allows mixed media recording as a video!
What about my situation,then? DEBUT does reach 30 fps on another computer...but,that's a Windows Vista one.I don't know how to re-assign the percentage of computer power sent to the DEBUT software.
In any event,when using .avi I always have to direct the output to Desktop (or My Videos) and then move that file to my USB.
When I use a high-quality Hewlett-Packard computer (such as at FedEx) I can output directly to that USB