Ch1.mp4 »

Professors often post links to recorded sessions using this format, such as "Lec1-ch1.mp4" (Lecture 1, Chapter 1).

In surveillance or dashcam systems, "ch1.mp4" typically refers to the video feed.

Many dashcams save the front camera recording as CH1.mp4 and the rear as CH2.mp4 . 2. Educational & Lecture Series

This is a standard way to label the first video in a series of lectures or chapters.

Systems like the Meitrack MDVR export files as CH1.mp4 , usually representing the main or front-facing camera.

Knowing the platform (e.g., a forum, a cloud drive, or a security app) will help identify exactly what the file contains.