Answer by dsgriffin for Getting metadata from a radio stream using MPMoviePlayer? (iOS)

Firstly, you need to set a NSNotification so that you can get the data at specific intervals, like so:

[[NSNotificationCenter defaultCenter] addObserver:self                                      selector:@selector(StreamMeta:)                                      name:MPMoviePlayerTimedMetadataUpdatedNotification                                      object:nil];

Next, you create the method. I am going to use streamMPMoviePlayer as the name of your MPMoviePlayerController and metaString as the NSString which will store the metadata values:

- (void)StreamMeta:(NSNotification*)notification{  if ([streamMPMoviePlayer timedMetadata] != nil) {      MPTimedMetadata *meta = [[streamMPMoviePlayer timedMetadata] objectAtIndex:0];      metaString = meta.value; // gives the NSString the artist/song information  }  else {     // No metadata available  }}