Filenames like this are often generated automatically by cameras, security systems, or messaging apps. To give you a better idea of what you're looking at, it could be one of the following:

It might be a clip shared in a private group (like Discord, Telegram, or WhatsApp) or a file from a personal cloud storage.

If the "b" is a typo and you meant "MP4," it could relate to the McLaren MP4/2 racing series.

Sometimes these strings refer to specific build files or assets in software development.

You might be looking for information on the Lenovo B611 MP4 Player , which has a similar alphanumeric name.