I am getting jerky motion after encoding midway through the video when watching on TV.

I am capturing cable TV with a WinTV-dbx(401) capture card at 352x480 with MJPEG set at 19 with VirtualDubVCR w/sync (resample audio data dynamically...). I drop about 9 frames during a 30 min capture.

After capture, I am using virtualdub to edit out commercials and frameserve to CCE to encode 352x480 MPEG-2 (interlaced)

Afterwards, I author and burn to a DVD-RW to test the video. While watching the video, initially the video plays fine. But after the point where the second commercial break had been edited out (~13 min), the video is jerky in any area with motion present.

A couple of questions:

My assumption is that the capture card changed field order mid capture. Does this sound correct? Is there any way to prevent this?

Is it possible that virtualdub created the problem when the commercial breaks were removed (by removing a single field)?

Please make any suggestions that may help, thanks.