If you have a file literally named 21147.mp4 and cannot open it:
: If the default player shows a "Format not supported" error, use the VLC Media Player which supports nearly all MP4 codecs. 21147mp4
Since "21147" is often used as a or unit ID in various databases, check which system you are using: If you have a file literally named 21147
: For Motorola VideoManager users, ensure you have updated to at least version 14.6.7 to resolve the DockController configuration issue. 21147mp4