Check the folder path. If it’s in Android/media/com.whatsapp , it's likely a video sent to you in a chat.

Highly recommended because it has its own codecs and doesn't rely on system-wide vulnerabilities.

You can usually delete these. They are often artifacts of a failed download or a video that was partially cached while you were scrolling social media.

MP4s are compressed, but high-definition files can be large. If the file size is 0KB, it's a "ghost" file and can be safely deleted.

: Temporary files from browsers or "blob" data from social media sites.

: Leftover data from video editing software or streaming apps. How to Handle Unknown MP4 Files Safely 🛡️

MP4s can occasionally be used to deliver "buffer overflow" exploits in outdated media players. 3. Use a Sandbox Player Don't use your default system player if you are suspicious.

💡 If you want to know exactly what is inside the video without playing it, use MediaInfo . It will show you the metadata, including the software used to create the file and the exact timestamp it was recorded.