No I just wondered what you meant when you said: I should say you are correct in saying soundcloud will have better audio quality simply because it has no video.
My reasoning was that the quality could be anything Soundcloud wanted it to be regardless of whether it used video or not originally. Same thing with Youtube. They can have the poorest picture they like and couple it with the best sound available if that is what they want to do. The sound and pictures don't have to be affecting the quality of each other. There will be a process takes place when downloading takes place. For want of a better phrase, the sound and or pictures will go to some kind of 'processing farm,' where it will be turned into whatever flavour of video and audio has been prescribed or macro'd by A.N. Other. Anyway I see now that you thought that MPeg processing might affect the sound. Question answered. Thanks.

Tom N.