My_movie_30_-_hd_1080p.mov (1080p).mp4 -

: The version number (because 1 through 29 just weren't quite right). "HD 1080p" : The resolution quality.

It looks like you've got a classic "default" filename on your hands! That specific naming convention——is typically generated by video editing software or online converters when a project isn't manually named before export. my_movie_30_-_hd_1080p.mov (1080p).mp4

Do you have a "my_movie_30" lurking in your folders? Let me know in the comments! : The version number (because 1 through 29