+ video = VideoContent::from_xml (this, node, version);
+ audio = AudioContent::from_xml (this, node, version);
+ subtitle = SubtitleContent::from_xml (this, node, version);
+
+ audio->set_stream (
+ AudioStreamPtr (
+ new AudioStream (
+ node->number_child<int> ("AudioFrameRate"),
+ /* AudioLength was not present in some old metadata versions */
+ node->optional_number_child<Frame>("AudioLength").get_value_or (
+ video->length() * node->number_child<int>("AudioFrameRate") / video_frame_rate().get()
+ ),
+ AudioMapping (node->node_child ("AudioMapping"), version)
+ )
+ )
+ );
+