The ".mp4" extension indicates a digital multimedia container typically used for video and audio. It is common for security systems, automated downloaders, or content management systems to name files using sequential ID numbers (like 578655.mp4). How to Inspect the File
There is a technical support thread on the Arduino forum with this exact ID (578655) discussing display screen instability. 578655mp4
3.5 TFT LCD mcufriend instability and inverted colors - Displays right-click the file
On Windows, right-click the file, select Properties , and go to the Details tab to see the video codec, frame rate, and resolution. 578655mp4