If you have the file locally, use VLC Media Player or a similar player to open it, as they can usually handle varied codec configurations within an MP4 container.
An MP4 file of this nature is not just a video; it is a "container" that can store video streams, audio streams, subtitles, and metadata, often using efficient codecs like H.264 or H.265. SKjZm4oom5Q mp4
Search for ://youtube.com to see if it is a public video. If you have the file locally, use VLC