If the "4OLVAnlE" part is a YouTube ID, searching for ://youtube.com might reveal the original source.
If you have this file on your computer and want to know what it contains without a description: 7423295-4OLVAnlE.mp4 ...
Right-click the file, select Properties , and look at the Details tab to see video dimensions and duration. Mac: Right-click and select Get Info for similar details. If the "4OLVAnlE" part is a YouTube ID,