在iOS 4.0中使用AVPlayer進行HTTP實時流式傳輸？

Question

是否可以在iOS 4.0上使用AVPlayer的HTTP Live Streaming？這顯然是4.0的記錄特徵。但是，如果我跑Apple's SitchedStreamPlayer sample code我的3GS運行iOS 4.0.1，點擊「加載電影」不打流，而是給出了一個錯誤：

2011-06-21 13:14:49.428 StitchedStreamPlayer[680:307] The asset's tracks were not loaded due to an error: Cannot Open

MPMediaPlayer能夠在同一臺設備上播放the same stream。但是，我需要AVPlayer的工作解決方案。

有誰知道如何讓Apple的StichedStreamPlayer代碼在4.0上工作？運行時需求說它應該適用於「iOS 4.0或更高版本」。

謝謝！

Answer 1

這是4.0中的一個錯誤，但我找到了解決方法。下面是加載視頻使用AVPlayer正確的方法：

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 

 

從StitchedStreamPlayer代碼工作在4.3而不是4.0.1：

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} 

 

更多信息請參閱the old version of StitchedStreamPlayer。