: A file might be encoded at 128 kbps (common for audio tracks within an MP4) or a specific video bitrate for low-bandwidth streaming.
In video compression, "128" is a common reference to bitrate: b128.mp4
The most likely professional or technical origin for a file named "b128" or similar is the standard. : A file might be encoded at 128
: 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
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