I have a video file called a.mpg I recorded on my camera. This file is
played correctly using Windows Media Player 10.0 on WinXP.
I tried to play this file in  a  Powerpoint program I created - but it
didn't play.
Searching the Web I found that Powerpoint uses mplay32.exe program to
play wideo and I need a codec for this program.

Using GSpot software it shows info about a.mpg file :
codec: MPEG2_Video, status : Codec(s) are Installed

But mplay32.exe refuses to play this file. Do I need a special
MPEG2_Video codec?
Other thing I don't understand:
Everest utility program shows under DirectX Video:

Supported FourCC codes:

I420
IMC1
....
YVYU

What does it means? Those four letters are codecs?

Thanks,

Zalek