I saved an animation as a set of images. It is 2800 frames, and the first 135 and the last 563 are just black. When I play the animation by going into camera view and clicking play in the Timeline, it plays fine, but when it renders, it cuts out a bunch of intermediate frames and fills in the beginning and end with black frames.
There is no Time Remapping, and it is set to No Sync. I had decided to change the frame rate from 25 to 30, so I increased the number of frames, scaled the keyframes on the Dope Sheet, and changed the Render > Dimensions > Frame Rate field to 30. So, maybe that is a reason, but I can't see why. What is my mistake?