Okay I know what was going on, I was using KSV's latest patched version...
Using the latest regular rtmpdump does in fact work, but I think the file size is really that small idod89!
The entire file that I've gotten is only 406KB... I guess that's because it's only 62.5K audio stream. It is the entire song though, so...
Oh well at least you've got your file now
