replaceCurrentItemWithPlayerItem

- (void)doReplaceURL
{
    if (self.player)
        {
            NSURL *sourceURL = [NSURL URLWithString:@"http://dg-live.world.edge001.int1-dus.dg-m.de/cnn/live.isml/live.m3u8?dvr_window_length=600"];
            AVURLAsset *sourceAsset = [AVURLAsset URLAssetWithURL:sourceURL options:nil];
            
            [self removePlayerItemObserver];
            self.playerItem = [AVPlayerItem playerItemWithAsset:sourceAsset];
                                
            if (self.player.currentItem != self.playerItem)
            {
                [self.player replaceCurrentItemWithPlayerItem:self.playerItem];
            }
            
            [self addPlayerItemObserver];
        }
}