Bj Hotel - 1.m4v

Programs like HandBrake often default to the .m4v extension when specific features like AC3 audio, SRT subtitles, or chapter markers are used.

The "1" often indicates a first version or part of a series (e.g., Part 1 of a multi-segment presentation).

It could be a personal recording of a stay or an event at a hotel property, exported via Apple-based editing software.