The issue I'm having is in Vegas Pro 14 (Build 270).
In my project I have one video track keyframed to have an image covering the head of a subject (that's in a different video track) as they move across the screen. In my project/preview the keyframed image follows the head of the person for every single frame. However upon rendering, there are several frames where the video track with the image doesn't follow the head for every single frame but will lag behind for a frame then catch up, fully showing their face which was never visible in the preview/editor. This is occurring to all my tracks that I've keyframed to follow/match something that's moving in the "base video". When I created the project file I had it match the framerate of the base video that I would be doing keyframing on top of. For context my project settings are 1280x720x32, 23.976p. When rendering (I believe) I've matched the framerate to the original video of the person's head but I've got to be doing something wrong.
So far I've tried:
File > Properties > [Video Tab] Match Media Video Settings
and selected the same video that has the moving person in it.
In the "Render As" window I have rendered samples of the part of the video with "Match project video frame rate" and "Match project settings" checkboxes selected, as well as one and both of them unselected. I get the same result each time.
Admittedly rendering/framerate stuff is one of my weak-points so my first assumption is that I'm doing something pretty dumb with my rendering settings (I am using the templates and other than verifying that the framerate is the same, I'm not changing anything else in the provided templates). I've tried googling around but am at a loss at this point and not sure what to do since the entire project is done besides this rendering issue.