G4_0139.mp4

: The "Date Created" timestamp is the best way to remember where you were or what you were filming at that time. Check File Size :

: Likely high-definition footage from an action camera or drone. g4_0139.mp4

: Right-click the file and select Properties (Windows) or Get Info (Mac). Look at the "Origin" or "Camera" section to see what device created it. : The "Date Created" timestamp is the best