Thanks for the advice! We were mostly sitting on tripods and just panning to track actor motion. There were a few moments where a camera was panning and zooming simultaneously, which I suspected might be culprits for a difficult track, but in general I thought this would just go super smoothly and was surprised when it didn’t.
They *are* mp4 files so I wonder if it’s the compression causing the issues as you mentioned. I’ll try the things you suggested and hope something works out!