QuickTime told me that I didn't have the right compressor to play the Video Blog: Geek Jihadi, so when I played it, all I got was audio.
I needed DivX.
First I had to figure out what DivX was:
DivX® is the brand name of the world's most popular video compression technology. At its core, DivX is a codec (short for compression/decompression) - a piece of software that compresses video from virtually any source down to a size that is transportable over the Internet without reducing the original video's visual quality.Then I had to go to the DivX site to download it
I quit QuickTime and then double clicked the video and it worked.