Thank you for replies that are trying to help. Last time I posted a question like this I just got bombarded with snarky comments about how I needed to stop wasting time here and do my own research.
The reason I was trying to use an mp4 file in AE is because my video editor doesn’t handle MTS files very well so I converted it, edited it and saved it as an High-def mp4 With my editor. I didn’t know I was going to need to edit it on after effects at the time so I wasn’t thinking about another file format.
Jason what render settings do you usually use? I use adobe media encoder to render my files from AE.