在iOS 4.0中使用AVPlayer进行HTTP直播

Question

是否可以在iOS 4.0上使用带有AVPlayer的HTTP Live Streaming？这显然是4.0的记录功能.但是,如果我在运行iOS 4.0.1的3GS上运行Apple的SitchedStreamPlayer示例代码,则单击"加载电影"不会播放该流,但会出错:

2011-06-21 13:14:49.428 StitchedStreamPlayer [680:307]由于错误,未加载资产的曲目:无法打开

MPMediaPlayer能够在同一设备上播放相同的流.但是,我需要一个使用AVPlayer的工作解决方案.

有谁知道如何让Apple的StichedStreamPlayer代码在4.0上运行？运行时要求说它应该适用于"iOS 4.0或更高版本".

谢谢!

Answer 1

这是4.0中的一个错误,但我找到了一个解决方法.以下是使用AVPlayer加载视频的正确方法:

    AVPlayer *player = [AVPlayer playerWithURL:[NSURL URLWithString:@"http://qtdevseed.apple.com/addemo/ad.m3u8"]];
// now use KVO to decide when it's ready to play
// works in both 4.3 and 4.0.1

 

StitchedStreamPlayer的代码在4.3但不是4.0.1中工作:

AVURLAsset *asset = [AVURLAsset URLAssetWithURL:[NSURL URLWithString:@"http://qtdevseed.apple.com/addemo/ad.m3u8"] options:nil];
    NSArray *tracksKeys = [NSArray arrayWithObjects:kTracksKey, kDurationKey, kPlayableKey, nil];
    [asset loadValuesAsynchronouslyForKeys:tracksKeys completionHandler:
     ^{
         NSError *error = nil;
         AVKeyValueStatus status = [asset statusOfValueForKey:[tracksKeys objectAtIndex:0] error:&error];
         NSLog(@"status=%@,error=%@",(status==AVKeyValueStatusLoaded?@"Loaded":status==AVKeyValueStatusFailed?@"Failed":@"?!"),error);
     }];

// output in 4.3: status=Loaded,error=(null)
// output in 4.0.1:  status=Failed,error=Error Domain=AVFoundationErrorDomain Code=-11828 "Cannot Open" UserInfo=0x15f2a0 {NSLocalizedFailureReason=This media format is not supported., NSUnderlyingError=0x1599e0 "The operation couldn’t be completed. (OSStatus error -12847.)", NSLocalizedDescription=Cannot Open}

 

有关更多信息,请参阅旧版本的StitchedStreamPlayer.