In iOS Avplayer, Addperiodictimeobserverforinterval Seems to Be Missing

In iOS AVPlayer, addPeriodicTimeObserverForInterval seems to be missing

Check this func addPeriodicTimeObserver(forInterval interval: CMTime,
queue: DispatchQueue?,
using block: @escaping (CMTime) -> Void) -> Any

It is in the documents also for example check this code snippet

let timeObserverToken = player.addPeriodicTimeObserver(forInterval: interval, queue: DispatchQueue.main) { [unowned self] time in 
}

Referenced from here

AVPlayer removing a periodicTimeObserver

Glad to see weakSelf worked for you ...

In the above I don't see you assigning the result of

  [player addPeriodicTimeObserverForInterval ...

to self.timeObserver it may be a typo but it should be ;

   self.timeObserver =  [player addPeriodicTimeObserverForInterval ...

if you intend to call

   [player removeTimeObserver:self.timeObserver]; 

you also missed the ";" above.

Is KVO on AVPlayerItem.loadedTimeRanges possible?

Actually, I'm using KVO for loadedTimeRanges without any trouble. Maybe you're just not setting the right options? The following is a very slight modification of some of the code in Apple's AVPlayerDemo, and it's working quite nicely for me.

//somewhere near the top of the file
NSString * const kLoadedTimeRangesKey   = @"loadedTimeRanges";
static void *AudioControllerBufferingObservationContext = &AudioControllerBufferingObservationContext;

- (void)someFunction
{  
    // ...

    //somewhere after somePlayerItem has been initialized
    [somePlayerItem addObserver:self
                       forKeyPath:kLoadedTimeRangesKey
                          options:NSKeyValueObservingOptionInitial | NSKeyValueObservingOptionNew
                          context:AudioControllerBufferingObservationContext];

    // ...
}

- (void)observeValueForKeyPath:(NSString*) path 
                  ofObject:(id)object 
                    change:(NSDictionary*)change 
                   context:(void*)context
{
    if (context == AudioControllerBufferingObservationContext)
    {
        NSLog(@"Buffering status: %@", [object loadedTimeRanges]);
    }
}

Is there a free or commercial dvd burner sdk for cocoa？

Apple provide an API of their very own: the Disc Recording Framework.

There is even a Disc Recording UI Framework, too.

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