: Right-click the file and select Properties (Windows) or Get Info (Mac) to check the "Details" tab. This may show the camera model, creation date, or software used to encode it. 2. How to Open and Play It

: Drag and drop the file into a web browser like Chrome or Firefox to see if it can render the video natively. 3. Analyze Technical Details

: Use VLC Media Player , which can play almost any .mp4 regardless of the internal codec.