Hi Joe
"Also, can someone give me a clue about how 6200+ images generated from a 3 minute video clip can be of practical use to ANYONE???"
Here is an example..The ability to extract individual images (even hundreds) from a movie has its uses.
In amateur astronomy for example, a single photograph, say, of Jupiter, is normaly unusable as the detail is blurred.due to atmospheric turbulence. The way around this is to shoot a short movie and then extract the individual images which can then be individually examined and the least blurred selected. (There are programs that will do this.)
In principle, these "better" images would still not be particularly good but each would hold detail missing from others. So by using a program for the purpose, (often the same program), the images can be "added" together, i.e. aligned and merged. The final composite image is smoother and less "pixelated" and now contains all the detail available. The final step is enhancment at various pixel levels producing a much better final photograph.
Nat