Many digital video recorders (DVRs) and CCTV systems use "PM" (often short for "Picture" or "Post-Meridiem") followed by a sequence number. would typically be the 20th clip in a recorded sequence. 2. Project or Media Management
If you have the file and are unsure what is in it, you can safely inspect it using these methods: PM020.mp4
: Right-click the file and select Properties > Details (Windows) or Get Info (macOS) to see the date it was created, which may provide a clue to its origin. Many digital video recorders (DVRs) and CCTV systems
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