+ * url The mandatory URL representing the media:
+ for plain file media - HTTP URL of this file,
+ for RTMP - RTMP URL,
+ for HLS - URL of the M3U8 media playlist,
+ for HDS - URL of the F4M manifest,
+ for DASH - URL of the MPD manifest or
+ base URL representing the media
+ if MPD manifest is parsed from
+ a string,
+ for MSS - URL of the ISM manifest.