95% of my standard AVI files work without re-encode
I don't understand what your asking?

95% of my standard AVI files work without re-encode
I don't understand what your asking?
There are various reasons why some avi's don't work and it's very hit and miss you may find a solution to one that doesn't work on another (as I have found) I have avi's that domino the others so the ps3 won't play anything until a reboot then I have some with picture and no sound and some with sound and no picture.
There is no simple click this and it will fix it solution unfortunately
AVIDemux, You open a movie. Check what the current container holds, And then if it's for example a AAC audio codec with 5.1 surround sound. (A problem i had with 360 a while back) Then I simply altered it to a 2 channel AAC. Didn't even have to touch the video. Took 5 minutes. And the AVI worked fine then.
AVIDemux is pretty much the best tool for sorting out your movies so they all work. As you can swap and change anything inside the container with it, and it's very simple and laid out.