The Splinter Cell is a live-action short film, running at around nine minutes, and it's been made entirely by fans. I emphasise that last bit because at times it's tough remembering that, since this looks like it could have been a pilot for an actual TV series.
Those are some nice cameras they're using. Nice cameras, and nice beards.
It was made by Atomic Productions (directed by Ben & Andrew Adams, starring John Redlinger).
The real, official Splinter Cell movie is apparently coming out next year.