I downloaded your video and tried to play it, but the file is corrupt after 0:20. That explains why the preview is only 0:20 as well.
I'll delete your local link so you can reupload, but I would suggest re-encoding your video first.
Also, you should have given more details in your deletion request. Something along the lines of, "Video is corrupted after 20 seconds, I'd like to reupload."
If I had handled your request before reading this thread, I would have asked for more details and denied your request.