: Many generic or "G-Sensor" equipped dashcams use a "G" prefix to denote protected files (videos recorded during an impact or sudden braking).
To help you review the content, here are common ways to identify what that specific file might be: Common Sources for "G4" Filenames g4_0139.mp4
: GoPro often uses a naming convention like GH010139.mp4 or GX010139.mp4 . If your file is g4_0139 , it may be a renamed clip or from a specific mobile app export. : Many generic or "G-Sensor" equipped dashcams use
: 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. : Right-click the file and select Properties (Windows)
: 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 a low-resolution proxy or a very short "event" clip from a dashcam.
: Certain DJI or Autel flight logs or cached video previews occasionally use similar alphanumeric strings. How to Review the File