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.

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

: 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. g4_0139.mp4

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

To help you review the content, here are common ways to identify what that specific file might be: Common Sources for "G4" Filenames : GoPro often uses a naming convention like GH010139

: Many generic or "G-Sensor" equipped dashcams use a "G" prefix to denote protected files (videos recorded during an impact or sudden braking).

: Certain DJI or Autel flight logs or cached video previews occasionally use similar alphanumeric strings. How to Review the File Check File Size : : Right-click the file

: Likely a low-resolution proxy or a very short "event" clip from a dashcam.