B128.mp4

: This is an international recommendation for loudness normalization .

: An ".mp4" file labeled "b128" (or "R128") might be a test file or a processed output designed to meet the -23 LUFS loudness target. 2. Hardware and Device Identifiers b128.mp4

: Many smartphones and devices (like the iPhone 16 or Samsung Galaxy S24 ) are sold in 128 GB variants. A file named "b128.mp4" could simply be a default demo video or a user-created file on a 128GB model. : This is an international recommendation for loudness

In video compression, "128" is a common reference to bitrate: b128.mp4