I have done this before but I must be forgetting something. I have a video on track 3 and I place a photo on video track 2 which will replace that segment of video on track 3. I go into pan/crop of the photo and hit lock aspect ratio and then right click the photo and select match output aspect and set first and last key frames by cropping the photo as I want it to zoom. However as I zoom in the video on track 3 starts to show on each side. This did not happen last time I did this. What am I doing wrong?