Framerate problem when using mp3+riff header

[Ned]

When I use Besweet to create an mp3 with riff header (it names it .wav and has less muxing overhead), the muxed avi always has messed up framerate, usually around 40-45. I can rename the wav back to mp3 and mux it fine.

What am I forgetting to do?

[Amerzone]

It also happened to me a couple of times to get a severely async VDub mux when using a wave-mp3 audio produced with BeSweet 1.11. On the contrary, if I feed the mp3 encoded by BeSweet to WaveMP3 v1.2 of VideoRipper, I had never any problem at all.