MP4 files explained: How to open and use - Adobe
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. 7423295-4OLVAnlE.mp4 ...
An file is a digital multimedia container format most commonly used to store video and audio. MP4 files explained: How to open and use
If the "4OLVAnlE" part is a YouTube ID, searching for ://youtube.com might reveal the original source. 7423295-4OLVAnlE.mp4 ...