M4s Files Guide

# Dump m4s structure mp4box -info seg1.m4s

If you have a folder of segment-*.m4s files and a missing init:

An (Media Segment for MPEG-DASH) is a chunk of video or audio data used in MPEG-DASH (Dynamic Adaptive Streaming over HTTP) streaming. The "m4" stands for MP4 -based container, and "s" stands for segment .