: 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.
: It almost certainly contains AAC (Advanced Audio Coding) audio. PM020.mp4
Since the file has an .mp4 extension, it uses the container format. This means: : Right-click the file and select Properties >
: It likely uses the H.264 (AVC) or H.265 (HEVC) video codec. This means: : It likely uses the H
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
: In professional video editing, files are often labeled by project codes. "PM" might stand for Project Manager , Product Marketing , or a specific internal project code (e.g., "Project Midnight").