During playlist handling, there is an assert (or more troubles) due to unset uri string in the soup message, as controller.uri is set after the Soup.Message creation:

Rygel-av-transport.vala:697

private async void handle_playlist (ServiceAction action,
                                        string uri,
                                        string metadata,
                                        string mime,
                                        string features) {
        var message = new Message ("GET", this.controller.uri);

It should be:

        var message = new Message ("GET", uri);

Rebuild librygel-renderer with this change, and playlists seem to work fine.