Troubleshooting: My video is not playing

The Problem

I inserted a video (.mpg) in a slide. But it was not playing in slideshow mode. I had chosen the option of 'play on click'. And when I was clicking, it was displaying a white rectangle.

The Solution

I find it a bit weird. MS PowerPoint does not play a video if the file name is more than 24 characters long. These characters include text, numbers and spaces. As soon as I reduced the file size, the video started playing. I found this solution on Microsoft Office's website.

Have you recently faced any problems playing a video in a presentation? Share it here. My problem was with MS Office, what about Keynote users? Share your problems and the solutions as well.