The naming convention, particularly the addition of (1) , often occurs when you download the same file multiple times to your device, with your computer or phone automatically numbering the copies.
If the file won't open in your default player, the VLC Media Player is a reliable, free tool that can handle almost any MP4 codec. 770054949544_3(1).mp4
Right-click the file, select Properties , and go to the Details tab to see the date created, frame width, and length. On Mac: Right-click the file and select Get Info . The naming convention, particularly the addition of (1)
If you found this in a temporary folder, it may be a cached version of a video you previously viewed on a social media platform. How to View or Identify the Content On Mac: Right-click the file and select Get Info
If you received this file as an attachment from an unknown sender, it is best not to open it, as unusual filenames can sometimes be used to disguise malicious content.