Could you tell me or what the video is supposed to be about? Knowing the context (e.g., a specific social media thread or a device) will help me track down the exact content for you.
If the "b" is a typo and you meant "MP4," it could relate to the McLaren MP4/2 racing series. b41111.mp4
Sometimes these strings refer to specific build files or assets in software development. Could you tell me or what the video is supposed to be about