webapp2
paste
webob
jinja2
uwsgi

about:flags

check 2 section,

    <video> elements media stream API

    enable peer connection     newer chrome(dev)
      or
    enable MediaStream         normal chrome

not to use STUN
    //var stun = "STUN stun.l.google.com:19302";
    var stun = "STUN NONE";

use google's STUN server
    var stun = "STUN stun.l.google.com:19302";
    //var stun = "STUN NONE";

at static/js/main.js