If you'd like to identify a specific video you found, could you describe or what happens in the video ?
Opening it with a standard media player like or Windows Media Player . 1_(2).mp4
: The standard file extension for digital video content. If you'd like to identify a specific video
How To Rename Files In Linux (Ubuntu) Using Terminal Commands 1_(2).mp4
the file and selecting Properties (Windows) or Get Info (Mac) to see the file size, creation date, and origin.