code: function (factor) {
      console.log('cull frames', factor);
      factor || (factor = 1);
      for (var i = 0; i < this.frameData.length; i++) {
        this.frameData.splice(i, factor);
      }
      this.setMetaData();
    }
docs: removes every other frame from the array Accepts an optional `factor` integer, which is the number of frames discarded for every frame kept.