Audio Normalization/Levelling for AVI MPG files

I have a number of music videos.  The problem is, when I play them, there is a large difference in the sound quality of the songs.  I have tried the Audio Leveling in Windows Media Player to no avail.  Is there any third party software I could use to run the MPG/AVI/etc files through to get a consistant sound level?  Is there a video player that has this build in that I can try?  I will be running the sound through a sound system at my wedding.  Is there a piece of audio equipment that I can use to accomplish this?
I only have two months to find a solution and make all necessary changes to the files if needed.  So the sooner I find a solution the better.  I am willing to try anything.  All suggestions are greatly appreciated.

Thanks
Jeremy
corner40Asked:
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fredshovelCommented:
Radio and TV stations use levellers, the most famous of which was and is the Aphex Compellor. You simply set the desired level and the Compellor will either lift or compress the programme to the desired level. Of course this is expensive professional equipment but you may wish to know just how it's done.
http://www.aphex.com/320A.htm
You could also try the Symetrix 422:
http://www.kabusa.com/symtx422.htm

Alternatively you would have to re-encode all your videos by capturing them with a video editor, splitting the audio out and either adjusting the volume in the video editor or exporting it to a dedicated audio editor and re-imorting it. Lots of work.
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corner40Author Commented:
thanks for the reply
I've contacted the company that I am renting my sound equipment from to see if they have any equipment similar to the devices you recommended.  I was afraid that I would have to, essentially, rip apart each song/video and then rebuild then again.  It would be a lot of work.

thanks again for the response.

Jeremy
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