Meaning of "brand" in video file formats?

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FFmpeg is a powerful tool for analyzing video files, providing detailed information about their format. When executed on a video file, FFmpeg outputs metadata including the major brand, minor version, and compatible brands. The major brand indicates the primary format of the file, while the compatible brands list other formats that the file can work with. This brand information is crucial for understanding the file's compatibility with various players and devices. Resources like ftyps.com offer additional insights into the significance of these brand identifiers in video file formats.
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What is the definition of "major brand" and "compatible brand" in the description of a video file?
The program ffmpeg can be run on a video file to print out information about the file format.
An example of some output:
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'Mid Air Engine Catastrophe - Air Crash investigation 2020 - Mayday Airplane Full documentary - Plane-_oKX1pcDt-E.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
What is the meaning of the brand information?
 
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I did some searching, and found this http://ftyps.com/ as well as some other links.

It appears the "brand" is another way of saying what format it is compatible with.
 
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