G078.mp4

Right-click > Get Info . Look under "More Info" for the device name or software used to create it. 2. How to Open "Mystery" Files

It is the "Swiss Army Knife" of video players and can play almost any format, including raw camera files. g078.mp4

Use a free tool like Untrunc or Fix.video . These tools look at a healthy file from the same camera (like g077.mp4) to rebuild the headers of the broken one. 4. Better Naming Habits Right-click > Get Info