- Uninstall 3ivx if you have it installed from my previous post.
- Visit Rarewares and download the MP4 Input Plugin for Winamp.
- Unzip the file (in_mp4.zip) and move the resulting in_mp4.dll file to your Winamp plug-ins folder, which commonly resides at C:\Program Files\Winamp\Plugins.
- Restart WinAMP if need be and you should be good to go :)
The Rarewares download is actually outdated, but works fine. If you want the latest version, you will have to compile it yourself. The source code for the plug-in is available as part of the FAAD source [latest version at time of writing: faad2-2.5].
If you find an updated version of the in_mp4 DLL anywhere, please leave a comment below :)