on() {
      var Nchunk = 1024 * 400;

      result = [{'chunks': [
          [ 77,  0*Nchunk,  8*Nchunk, 16],
          [ 77,  8*Nchunk, 16*Nchunk, 16],
          [ 77, 16*Nchunk, 24*Nchunk, 16],
          [ 77, 24*Nchunk, 32*Nchunk, 16],
      ]}];
      loaded(result);

      setTimeout(fake_loaded_3, 1000);
  };

  var fake_loaded_3 = function() {
      var Nchunk = 1024 * 400;

      result = [{'chunks': [
          [ 77,  8*Nchunk, 16*Nchunk, 16],
          [ 77, 16*Nchunk, 24*Nchunk, 16],
          [