Open it with VLC Media Player or MPC-HC. These players bypass most container issues and can play the video even if it's just a renamed MP4.
However, based on the reference and the .m4v extension, here is what you should know about this file: 📄 File Details & Context 1_4922468623605302054.m4v - BayFiles
Filenames starting with 1_ followed by a long string of digits are characteristic of files downloaded from Telegram or similar encrypted messaging services that rename files upon upload. Open it with VLC Media Player or MPC-HC
If your device doesn't recognize it, you can often simply rename the .m4v to .mp4 without damaging the file. If your device doesn't recognize it, you can
If you found this filename on a random website promising a "complete feature" movie, it is likely a decoy file . Downloading and running files with these generic names from unverified hosting sites like "BayFiles" clones is a common way to distribute viruses or adware .
While playing in VLC, go to Tools > Media Information . This may reveal the actual movie title, director, or studio in the "Title" or "Comments" field.