相关疑难解决方法(0)

我有以下代码适用于iOS 6和7.x.

在iOS 8.1中,我有一个奇怪的问题,如果你捕获会话大约13秒或更长时间,结果AVAsset只有1个轨道(视频),音频轨道就不存在.

如果您录制的时间较短,则AVAsset会有预期的2个音轨(视频和音频).我有足够的磁盘空间,该应用程序有权使用相机和麦克风.

我用最少的代码创建了一个新项目,它重现了这个问题.

任何想法将不胜感激.

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController
{
    enum RecordingState { Recording, Stopped };
    enum RecordingState recordingState;

    AVCaptureSession *session;
    AVCaptureMovieFileOutput *output;
    AVPlayer *player;
    AVPlayerLayer *playerLayer;
    bool audioGranted;
}

- (void)viewDidLoad {
    [super viewDidLoad];

    [self setupAV];
    recordingState = Stopped;
}

-(void)setupAV
{
    session = [[AVCaptureSession alloc] init];
    [session beginConfiguration];
    AVCaptureDevice *videoDevice = nil;

    for ( AVCaptureDevice *device in [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo] ) {
        if ( device.position == AVCaptureDevicePositionBack ) {
            videoDevice = device;
            break; …