I just finished rendering a video, and when I opened it, it was just a still image. The bottom of the video was moving but not the top. It took it over an hour to export this. I have FFMPEG downloaded correctly, and everyone was working fine. But when I finished the export and opened it, it was not working. I played the replay I had made while I was still editing it before I rendered it and it worked great multiple times. Do you guys know what happened?