: Many DVR systems (like Hikvision or Dahua) use alphanumeric strings to tag motion-detected clips.
: Upload the file to VirusTotal to check for viruses and view the file's header information. g8643.mp4
: Automotive cameras often use sequential numbering for saved "event" files. : Many DVR systems (like Hikvision or Dahua)
: Right-click the file, open with VLC, and go to Tools > Codec Information . This will tell you the resolution and the software used to encode the video. To provide a more specific report, could you tell me: open with VLC