I got something with mimic recently. The first frame or two were blown up and the last few frames had movement not in the speech. I know this isn't your question, just thought I'd share. I ditched the first few in Video Wave 5 which is what I use for stitching. I solved the last few by making sure there was no noise from the mike. Sounds like the answers to your question are already answered above. Best wishes and hope to see some stuff.