B41123.mp4

If you have this file and need to know its content or origin, you can use these tools to extract its metadata:

Could you provide more on where you encountered this filename or what you expect the video to contain?

: While the container is MP4, the actual video is compressed using a "codec" such as H.264 , HEVC (H.265) , or AV1 . How to Analyze an Unknown File

: Excellent for finding timestamps or GPS coordinates that might be embedded in the file, which is common for files generated by mobile phones or professional equipment.