混合视频类型内容在iPhone上的AVQueuePlayer中排队 [英] Mixed Video Type Content queued in an AVQueuePlayer on iPhone
问题描述
我想为这篇荒唐的文章道歉，但我尝试提供尽可能多的代码和数据供您参考.
I'd like to start of by apologizing for this ridiculously long post, but I tried to provide as much code and data as possible for you to refer to.
我正在一个视频项目中，我需要AVQueuePlayer的灵活性(最重要的是可以自由缩放和布局视频层，以及创建自定义控件的能力).问题是，我需要能够混合不同类型的视频内容(在这种情况下为渐进式下载.mp4和http流.m3u8).这是时髦的地方.
I am working on a video project where I will need the flexibility of the AVQueuePlayer (foremost the ability to scale and layout the video layer freely, as well as creating my customized controls). Problem is, I need to be able to mix video content of different types (in this case progressive download .mp4 and http streaming .m3u8). Here's where things get funky.
首先提供一些帮助您入门的代码:
First some code to get you going:
- (void)viewDidLoad {
[super viewDidLoad];
NSArray *assetsArray = [NSArray arrayWithObjects:
[AVPlayerItem playerItemWithURL: [NSURL URLWithString: kTestPrerollURL]], // .mp4-file on server
[AVPlayerItem playerItemWithURL: [NSURL URLWithString: kTestVideoURL]], // .m3u8-file on server
[AVPlayerItem playerItemWithURL: [NSURL fileURLWithPath: [[NSBundle mainBundle] pathForResource: @"2" ofType:@"m4v"]]], // local m4v-file
[AVPlayerItem playerItemWithURL: [NSURL fileURLWithPath: [[NSBundle mainBundle] pathForResource: @"3" ofType:@"m4v"]]], // local m4v-file
nil];
// Add KVO observation on each player item to track when they are ready for playback
for(id playerItem in assetsArray) {
[playerItem addObserver: self forKeyPath:@"status" options: 0 context: NULL];
}
[self setPlayer: [AVQueuePlayer queuePlayerWithItems: assetsArray]];
[self setPlayerLayer: [AVPlayerLayer playerLayerWithPlayer: [self player]]];
[[self playerLayer] setFrame: [playerView bounds]];
// Additional layer customization...
[[playerView layer] addSublayer: [self playerLayer]];
[playerView setBackgroundColor: [UIColor clearColor]];
[[NSNotificationCenter defaultCenter] addObserver: self
selector: @selector(playerItemDidReachEnd:)
name: AVPlayerItemDidPlayToEndTimeNotification
object: nil];
}
当AVPlayerItem更改状态时，将调用此方法:
And when the AVPlayerItem changes status, this method is invoked:
- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
// A bunch of loggers...
if([(AVPlayerItem *)object status] == AVPlayerItemStatusReadyToPlay) {
CGSize movieSize = [[[player currentItem] asset] naturalSize];
CGRect playerRect = [playerView frame];
playerRect.size.height = playerRect.size.width * movieSize.height/movieSize.width + 7.0;
[playerView setFrame: playerRect];
[playerLayer setFrame: [playerView bounds]];
[player play];
}
}
如果用户选择按下下一步"按钮，则播放器将跳至下一个剪辑:
If the user chooses to press a "Next"-button, the player skips to the next clip:
- (IBAction)next:(id)sender {
NSLog(@"------ USER SWITCHED TO NEXT ------");
AVPlayerItem *object = (AVPlayerItem *)[player currentItem];
[object removeObserver:self forKeyPath: @"status"];
[player advanceToNextItem];
}
最后，当AVPlayerItem到达末尾时，将调用此方法:
Finally, when the AVPlayerItem reaches the end, this method is invoked:
- (void)playerItemDidReachEnd:(NSNotification *)notification {
NSLog(@"------ PLAYER ITEM DID REACH END ------");
AVPlayerItem *object = (AVPlayerItem *)[notification object];
[object removeObserver:self forKeyPath: @"status"];
}
好吧，所以我的问题是混合不同格式(在本例中为m3u8文件)会导致一些时髦的行为.
Ok, so my problem is that mixing different formats (in this case the m3u8-file) causes some funky behavior.
如果我首先在队列中加载m3u8文件，则它会正常播放，但是如果我AdvanceToNextItem，则该应用程序将崩溃. NSZombieEnabled报告:
If I load the m3u8-file first in the queue, it plays properly, but if I advanceToNextItem the app crashes. NSZombieEnabled reports:
*** -[Not A Type retain]: message sent to deallocated instance 0x684dfe0
[Switching to process 67957]
并且调用堆栈显示了释放的范围(MyPlayer是项目的名称):
And the call stack shows a release out of my bounds (MyPlayer is the name of the project):
po [NSThread callStackSymbols]
2011-01-05 16:12:57.151 MyPlayer[67957:6303] *** __NSAutoreleaseNoPool(): Object 0x56a0580 of class _NSCallStackArray autoreleased with no pool in place - just leaking
<_NSCallStackArray 0x56a0580>(
0 MyPlayer 0x00002154 start + 0,
1 CoreFoundation 0x00e72f22 _CF_forwarding_prep_0 + 50,
2 CoreFoundation 0x00e140bc CFRetain + 92,
3 CFNetwork 0x014c436e _ZN21XConnectionEventQueueI12XLoaderEvent18XLoaderEventParamsE10pushEventsEP20XConnectionEventInfoIS0_S1_El + 120,
4 CFNetwork 0x014c4252 _ZN19URLConnectionLoader16pushEventsLockedEP20XConnectionEventInfoI12XLoaderEvent18XLoaderEventParamsEl + 120,
5 CFNetwork 0x014c41c7 _ZN19URLConnectionLoader10pushEventsEP20XConnectionEventInfoI12XLoaderEvent18XLoaderEventParamsEl + 57,
6 CFNetwork 0x015976b6 _ZN19URLConnectionClient25getRequestForTransmissionEhP14_CFURLResponsePK13_CFURLRequestPP9__CFError + 942,
7 CFNetwork 0x014c3030 _ZN19URLConnectionClient22_clientWillSendRequestEPK13_CFURLRequestP14_CFURLResponsePNS_26ClientConnectionEventQueueE + 230,
8 CFNetwork 0x01597789 _ZN19URLConnectionClient26ClientConnectionEventQueue33processAllEventsAndConsumePayloadEP20XConnectionEventInfoI12XClientEvent18XClientEventParamsEl + 141,
9 CFNetwork 0x014c2e3c _ZN19URLConnectionClient13processEventsEv + 100,
10 CFNetwork 0x014c2cb7 _ZN17MultiplexerSource7performEv + 251,
11 CoreFoundation 0x00ee301f __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 15,
12 CoreFoundation 0x00e4128b __CFRunLoopDoSources0 + 571,
13 CoreFoundation 0x00e40786 __CFRunLoopRun + 470,
14 CoreFoundation 0x00e40240 CFRunLoopRunSpecific + 208,
15 CoreFoundation 0x00e43504 CFRunLoopRun + 84,
16 CoreMedia 0x00cb39af FigThreadGlobalNetworkBufferingRunloop + 149,
17 CoreMedia 0x00cb624a figThreadMain + 308,
18 libSystem.B.dylib 0x9473885d _pthread_start + 345,
19 libSystem.B.dylib 0x947386e2 thread_start + 34
)
如果.m3u8文件放置在队列中第一个位置之后的某个位置，则我的状态为AVPlayerItemStatusFailed，并且剪辑跳到队列中的下一个剪辑.
if the .m3u8-file is placed somewhere after the first position in the queue, I get a status AVPlayerItemStatusFailed, and the clip skips to the next clip in the queue.
我意识到这可能与某些内存管理有关，但与此同时，我开始对此表示怀疑.但是，很明显我做错了，所以每一个解决方案的建议都值得欢迎.
I realize this might be related to some memory management, but at the same time I start doubting it. However, it is quite evident I am doing something wrong, so every suggestion of a solution is more than welcome.
推荐答案
您不能执行此操作-AVPlayer可以播放HLS内容(M3U)或不播放流媒体，但不能混合播放. 详情请参见: https://devforums.apple.com/message/570406#570406
You can't do this - AVPlayer can either play HLS content (M3U) or non-streamed, but not a mix. See this for details: https://devforums.apple.com/message/570406#570406
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