Screwed up describing it. This doesn't shorten a video. It speeds it up (or slows it down, if you give it a negative number).
All the content remains there.
Had thought initially "cut 4 seconds off" but the ending quote is awesome and wanted to keep it, "Ladies and gentlemen, please, take your seats; the show is about to begin."
So it's all there, and just under 3% faster.
TYagainB!