4) DivX ;-) 3.11a Alpha - ASF without the drawbacks
Origins: A guy who went by the handle "Gej" used a hex editor and some other tools to modify the binary dll file of Microsoft's MS-MPEG4v3 ASF codec so that it would work under AVIs, so that you could use it to encode high-res movies (since ASF was restricted to 352x288 resolution). He then released it onto the net. This became the original DivX which was updated until version 3.11alpha
Taken from some interesting reading at;
http://www.animemusicvideos.org/guides/avtech/video4_2.htm
Pauly Man,
You might try using G-Spot to identify the Video and Audio Codecs. See if it gives you the same thing (AAc). It’s a very handy utility to have, in case you don’t know about it. It is free and available here;
http://www.softnews.ro/public/cat/11/2/7/11-2-7-12.shtml
I had a similar problem to yours (no audio), but what was missing was the ac3 filter, not AAc. After using GSpot to identify the problem I was able to hunt down what I needed off the web.
-Good Luck
PS
Just like Russ was saying about the Nimo codecs interfering, I have found conflicting codec troubles too. For that reason I never use any more codecs than those actually needed, and I avoid those packs containing gadzooks of codecs all bundled up in one package.
GSpot is a great tool for keeping the number of codecs to a minimum.
One example, the DivX5.05 Codec (which I’ve been playing with recently) will write itself over the place of the 5.02 codec, and then fail to work with one of my programs. If I uninstall either one then reboot and perform the install I won’t get this problem.
Maybe you can get lucky with AAC utilizing a google search;
http://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=AAc+codec