It typically uses H.264 or H.265 video compression, which provides high quality at a relatively small file size.

For example, is it a file from a security camera , a car enthusiast's archive , or a gaming folder ? How to Create and Open an MP4 File

Many digital cameras and dashcams use a prefix (like "g" for GoPro or "G" for certain General Plus chipsets) followed by a sequence number (001).