If you're looking to view or edit it, the MP4 format is widely compatible across almost all modern devices.
What was the "good piece" of—a cool action shot, a security catch, or something else? VLC for Android – Apps on Google Play YI1004484.mp4
It sounds like you've found a solid video file! While I don't have direct access to private files named , that specific naming convention (often starting with "YI") is common for files generated by Yi Technology cameras, such as their popular action cams or home security systems. If you're looking to view or edit it,
If you're having trouble playing it, the VLC Media Player is a great "universal" choice that handles most codecs. a security catch