Is it possible to join two Xvids together with different audio sampling rates? I guess some kind of audio conversion is required?!
Yep, just loed them into VirtualDUB, set Video to Direct Stream Copy and Audio to Full Processing Mode, then in Audio set Conversion to 48000hz, 16bit, Stereo, High Quality. Then Save AVI. Do this for each. Its converting the audio to a WAV for each. Then just use the Append option to join the 2 avis.
Why would you need direct stream copy for the video if you want to transcode the audio?
Arr… because we don’t want to transcode the Video, only the Audio.