Everyone thinks a video is just a video, but when the video is digitized from the lens of a camera and stored on a median, artifacts can occur. When recorded video is encoded by the recording software, it is set to certain aspects and resolution. When video is decoded by software and displayed on a monitor, it may not display with the same settings as it was encoded.
We are here to help you understand exactly what you observe in a video is evidence and is being displayed properly on the playback monitor.