Thanks, Shane. Much appreciated. I normally work strictly with my own footage from my 5D. However, I recently had my first project with two different formats comprising of my own 5D footage and some from a video I downloaded and used some of the material for b-roll.
When I started that project, the first clip I dropped in the timeline was from the downloaded video which was 853×480. I chose “yes” to automatically conform the sequence settings (which I was oblivious to at the time). After two or three days I ran the final cut through compressor and it came out looking horrible. My 5D clips were squeezed and stretched and looked awful. My brother and I worked for hours on a remedy so we wouldn’t have to re-do the entire thing and eventually got it to work.
I am assuming I should have begun with my 5D clips.
Again, thanks.