iOS: 应用崩溃由于dispatch_queue。

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iOS: 应用崩溃由于dispatch_queue。

我正在尝试使用这段代码：https://stackoverflow.com/a/14063081/1011125。

但在我的iPhone 4（iOS 7）上，这部分导致整个应用程序崩溃：

dispatch_queue_t queue = dispatch_queue_create("cameraQueue", NULL);
[output setSampleBufferDelegate:self queue:queue];

这段代码有什么问题？

崩溃日志

OS版本：iOS 7.1（11D169）
报告版本：104
异常类型：EXC_BAD_ACCESS（SIGSEGV）
异常子类型：KERN_INVALID_ADDRESS at 0xe000000c
触发线程：2
线程0：
0   libsystem_kernel.dylib          0x38e4da58 mach_msg_trap + 20
1   libsystem_kernel.dylib          0x38e4d854 mach_msg + 44
2   CoreFoundation                  0x2e0bb896 __CFRunLoopServiceMachPort + 150
3   CoreFoundation                  0x2e0ba002 __CFRunLoopRun + 850
4   CoreFoundation                  0x2e024f4a CFRunLoopRunSpecific + 518
5   CoreFoundation                  0x2e024d2e CFRunLoopRunInMode + 102
6   GraphicsServices                0x32f2965e GSEventRunModal + 134
7   UIKit                           0x30970168 UIApplicationMain + 1132
8   Lockr                           0x00048fa0 main (main.m:16)
9   libdyld.dylib                   0x38daaab4 start + 0
线程1：
0   libsystem_kernel.dylib          0x38e4d808 kevent64 + 24
1   libdispatch.dylib               0x38d99de8 _dispatch_mgr_invoke + 228
2   libdispatch.dylib               0x38d88f6e _dispatch_mgr_thread$VARIANT$up + 34
线程2 崩溃：
0   libobjc.A.dylib                 0x388a7626 objc_msgSend + 6
1   AVFoundation                    0x2d00dc16 __74-[AVCaptureVideoDataOutput _AVCaptureVideoDataOutput_VideoDataBecameReady]_block_invoke + 394
2   libdispatch.dylib               0x38d85830 _dispatch_call_block_and_release + 8
3   libdispatch.dylib               0x38d85de8 _dispatch_queue_drain$VARIANT$up + 440
4   libdispatch.dylib               0x38d86292 _dispatch_queue_invoke$VARIANT$up + 34
5   libdispatch.dylib               0x38d9888a _dispatch_root_queue_drain + 74
6   libdispatch.dylib               0x38d98b1c _dispatch_worker_thread2 + 52
7   libsystem_pthread.dylib         0x38ec7bd0 _pthread_wqthread + 296
8   libsystem_pthread.dylib         0x38ec7a94 start_wqthread + 4
线程3 名称：com.apple.coremedia.player.async
线程3：
0   libsystem_kernel.dylib          0x38e4daa8 semaphore_wait_trap + 8
1   libdispatch.dylib               0x38d98f74 _dispatch_semaphore_wait_slow + 172
2   MediaToolbox                    0x2f540ab4 fpa_AsyncMovieControlThread + 1752
3   CoreMedia                       0x2e6531e0 figThreadMain + 192
4   libsystem_pthread.dylib         0x38ec9916 _pthread_body + 138
5   libsystem_pthread.dylib         0x38ec9886 _pthread_start + 98
6   libsystem_pthread.dylib         0x38ec7aa0 thread_start + 4
线程2的ARM线程状态（32位）崩溃：
    r0: 0x15dd6e60    r1: 0x30f39275      r2: 0x00000004      r3: 0x0000000d
    r4: 0x15e58e20    r5: 0x30f39275      r6: 0x38f6696c      r7: 0x02b93f3c
    r8: 0x30f74e46    r9: 0xe0000000     r10: 0x2d07cd11     r11: 0x398b7cf8
    ip: 0x38f3a8cc    sp: 0x02b93ef8      lr: 0x2d00dc1b      pc: 0x388a7626
  cpsr: 0x60000030

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