The file might be a "Mute MP4" (often used for GIFs) or uses an AC3 audio track. Try VLC.
If you don't want to install software, you can drag the file into a browser like Chrome or Edge . 71927-_1668309908.mp4
Use VLC Media Player . It can play almost any MP4 regardless of how it was encoded. The file might be a "Mute MP4" (often
Look for the or "Encoder" tags. This will tell you if it was made by an iPhone, an Android, or a specific editing software. or a specific editing software.