This feature prevents your device from overwriting old footage and makes it easy to chronologically sort your videos in a file explorer. 2. High-Efficiency Compression

The primary "feature" of a name like S0086.mp4 is . The "S": Usually stands for "Stream" or "Sequence."

It seems you're referring to a specific video file or a feature associated with a device (like a dashcam or smartphone) that generates files with the "S0086.mp4" naming convention. If this is a file name generated by your device, 1. Sequential File Numbering

This allows you to record long sessions (like a 2-hour drive on a dashcam or a long family video) without filling up your SD card instantly. It maintains high visual quality while keeping the file size small enough to share easily. 3. Loop Recording (Common for Dashcams)