webcam.com is one of the many duplicates of streamate.com. Maybe you'll find more if you search for it.
Using this script at the models page gives you a working rtmpdump line.
Code:
javascript: var raw=document.getElementById('avchat').lastChild.getAttribute('value').split('&'); var fv={}; for(var i in raw) {var d=raw[i].split('='); fv[d[0]] = unescape(d[1]);} var swfu=document.getElementById('avchat').getAttribute('data'); var turbo=fv['turbo'].split(';'); prompt('RTMPDumpCL','rtmpdump -v -r "'+turbo[2]+'" -a "reflect/'+fv['p_sid']+'" -s "'+swfu+'" -C S:'+turbo[3]+' -C S:'+fv['p_pid']+' -C S: -C O:1 -C NS:srv:'+fv['p_srv']+' -C NS:sid:'+fv['p_sid']+' -C NS:sessionType:'+fv['sessionType']+' -C O:0 -y "'+fv['p_sid']+'" -o "'+fv['p_sid']+'_'+Number(new Date()/1000).toFixed(0)+'.flv"');
Don't expect to stream private shows.