[
  { "id" : "actor0", "type" : "ClutterActor" },
  {
    "id" : "timeline0",
    "type" : "ClutterTimeline",
    "duration" : 1000,
    "actor" : "actor0",

    "markers" : [
      { "name" : "marker0", "time" : 250 },
      { "name" : "marker1", "time" : 500 },
      { "name" : "marker2", "time" : 750 },
      { "name" : "marker3", "progress" : 0.5 }
    ]
  }
]
