This is a very handy tool to tell you what your video file is. MediaInfo is what I got the video details from earlier up this thread.
http://www.codecguide.com/download_other.htm
I have the version that gets installed with the K-Lite codec pack installed on the Right Click OS menu. Very handy to find out what you are dealing with.
When you compare your video to the one Aminifu posted you can see that yours has no trace of audio included.
Edit again... now replaced with a safer link. Scroll down the page to look for
MediaInfo Lite. The original link I posted goes to an installer with that fscking Open Candy Scamware crud in it. That OpenScamdy stuff is a right evil mess of trying to confuse you into installing carp that will take over your PC.