WAV to MP4 Conversion Program
I wrote a Visual C++ 2003 .NET Win32 program, in which I made calls to the various Windows API functions. The only external software I used was the Win32 library. All the rest, that does the automation, I wrote myself. Can’t tell you too much more than that without just giving you the program. 
I’d be happy to sell you a copy of the executable for cheap, or a copy of the source code for somewhat more.
Let me know if interested,
Tom