--use-fake-device-for-media-stream
--enable-logging --v=1 --vmodule=*source*/talk/*=3
/talk/app/webrtc/mediaconstraintsinterface.h
Starting firefox with logging (for data channels and sctp in this case):
NSPR_LOG_MODULES=datachannel:5,sctp:5 /opt/browsers/firefox/stable/firefox http://localhost:9966/