If you are having trouble opening the file, it is possible the .mp4 extension was added simply to allow it to be viewed, but the file was created using a proprietary codec.
Since this is an .mp4 file, you won't need special software to watch it, but you might need specific tools to interpret it. StkeHMM Lea19 mp4
If you can provide more context, I can refine this post. Tell me: If you are having trouble opening the file,
Based on industry naming conventions, likely refers to a specialized, high-definition video file ( .mp4 ) generated from a data analysis or simulation process. likely refers to a specialized