This is likely a study, project, or researcher designation, potentially referring to a simulation run in 2019 ("Lea19" or "LEA 2019").
What is the ? (e.g., 5MB vs 5GB, which helps determine if it's a short clip or a long simulation) This will help me pinpoint the exact nature of the study. StkeHMM Lea19 mp4
Use standard media players like VLC Media Player or QuickTime. This is likely a study, project, or researcher