Hi Aielman,
I'm no pro but all I can tell you is that tmpgenc is the best video encoder for MPEG1 or MPEG2 on low bitrates.
Since you are using the best video encoder why not use some of the best audio encoders out there.
You can try to download HeadAC3he or BeSweet.
The reason we use these it's because some of us noticed tmpgenc didn't produce the audio quality we expected.
So if you're going to use one of those nice audio toys you'll have to mux the video and the audio in the end.
So use bbmpeg or mplex.
You'll find the links here
http://www.kvcd.net/forum/viewtopic....asc&highlight=
C ya