If your DSLR is the Canon 5D MK II, you might want to look at the many posts on that camera's MOV files on this forum. There have been many issues.
Otherwise, you might have luck mixing these sources on one Sequence, or may haver better luck with unique Sequences. I'd try the former, and see what problems arise.
Thanks Hunt. It is a 5Dm2 so I will do a search. Riojas forever!!!!
A couple of searches didn't help, so I did a test.
The 5DM2 clip played with jerky motion in PPro timeline preview. But when rendered in place it played perfectly, and played well with other regular video clips.
Thanks again. CB