Right-click the file > Properties > Details . Look at the "Origin" or "Video" sections.
If your standard player won't open it, the file might use a specific "codec" (a way of compressing video). g078.mp4
Sometimes dragging an MP4 into a Chrome or Safari window will trigger a built-in player that works better than system defaults. 3. Fixing a Corrupt "g078.mp4" Right-click the file > Properties > Details
YYYY-MM-DD_Event-Name_Location.mp4 Example: 2024-05-12_Hiking_Grand-Canyon.mp4 g078.mp4