CocoaAndAVFoundation
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エラートラッキング

--- a/testAVFoundation/HMDocument.m

+++ b/testAVFoundation/HMDocument.m

		@@ -138,12 +138,22 @@
138	138	[_asset autorelease];
139	139	_asset = [asset retain];
140	140
141		- [_asset loadValuesAsynchronouslyForKeys:[NSArray arrayWithObject:@"tracks"]
	141	+ NSString *tracksKey = @"tracks";
	142	+ [_asset loadValuesAsynchronouslyForKeys:[NSArray arrayWithObject:tracksKey]
142	143	completionHandler:
143	144	^ {
144	145	dispatch_async(dispatch_get_main_queue(),
145	146	^{
146		- self.item = [AVPlayerItem playerItemWithAsset:_asset];
	147	+ NSError *error = nil;
	148	+ AVKeyValueStatus status = [_asset statusOfValueForKey:tracksKey error:&error];
	149	+ if(status == AVKeyValueStatusLoaded) {
	150	+ self.item = [AVPlayerItem playerItemWithAsset:_asset];
	151	+ } else {
	152	+ NSLog(@"Asset's tracks were not loaded.\n%@", [error localizedDescription]);
	153	+ if(![self presentError:error]) {
	154	+ [self close];
	155	+ }
	156	+ }
147	157	});
148	158	}];
149	159	}