It is your pipe config try bellow!
Enjoy
rtmpdump -r "rtmp://IPADDRESSHERE:1935/live playpath=ss1ss swfUrl=http://www.SWFSITE.co/PLAYER.swf live=1 pageUrl=http://www.PAGEURL/embed.php?live=STREAM&vw=620&vh=490" | avconv -i pipe:0 -y -v:v info -vcodec copy -acodec copy -f flv rtmp://localhost/rtmp/name"