value_set_caps_features
function value_set_caps_features(value:GObject.Value, features:Gst.CapsFeatures):void {
    // Gjs wrapper for gst_value_set_caps_features()
}Sets the contents of value to features.
- value
- a GValue initialized to GST_TYPE_CAPS_FEATURES 
- features
- the features to set the value to