iOS 8 iPad AVCaptureMovieFileOutput下降丢失从未在录制13 – 14秒后获得音轨

概述我有以下代码适用于iOS 6& 7.x版本 在iOS 8.1中,我有一个奇怪的问题,如果您捕获约13秒或更长时间的会话,则产生的AVAsset只有1个音轨(视频),音轨不在那里. 如果录制时间较短,AVAsset将按预期的方式播放2个音轨(视频和音频).我有足够的磁盘空间,应用程序有权使用摄像头和麦克风. 我用最小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 " 我有以下代码适用于iOS 6& 7.x版本

在iOS 8.1中,我有一个奇怪的问题,如果您捕获约13秒或更长时间的会话,则产生的AVAsset只有1个音轨(视频),音轨不在那里.

如果录制时间较短,AVAsset将按预期的方式播放2个音轨(视频和音频).我有足够的磁盘空间,应用程序有权使用摄像头和麦克风.

我用最小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;        }    }    AVCaptureDevice *audioDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];    if (vIDeoDevice && audioDevice)    {        AVCaptureDeviceinput *input = [AVCaptureDeviceinput deviceinputWithDevice:vIDeoDevice error:nil];        [session addinput:input];        AVCaptureDeviceinput *audioinput = [AVCaptureDeviceinput deviceinputWithDevice:audioDevice error:nil];        [session addinput:audioinput];        NSURL *recordURL = [self tempurlForRecording];        [[NSfileManager defaultManager] removeItemAtURL:recordURL error:nil];        output= [[AVCaptureMovIEfileOutput alloc] init];        output.maxRecordedDuration = CMTimeMake(45,1);        output.maxRecordedfileSize = 1028 * 1028 * 1000;        [session addOutput:output];    }    [session commitConfiguration];}- (IBAction)recordingbuttonClicked:(ID)sender {    if(recordingState == Stopped)    {        [self startRecording];    }    else    {        [self stopRecording];    }}-(voID)startRecording{    recordingState = Recording;    [session startRunning];    [output startRecordingToOutputfileURL:[self tempurlForRecording] recordingDelegate:self];}-(voID)stopRecording{    recordingState = Stopped;    [output stopRecording];    [session stopRunning];}- (voID)captureOutput:(AVCapturefileOutput *)captureOutput dIDFinishRecordingToOutputfileAtURL:(NSURL *)outputfileURL fromConnections:(NSArray *)connections error:(NSError *)error{    AVAsset *camerainput = [AVAsset assetWithURL:[self tempurlForRecording]];    //DEPENDING ON HOW LONG RECORDED THIS DIFFERS (<14 SECS - 2 Tracks,>14 SECS - 1 Track)    NSLog(@"Number of tracks: %i",camerainput.tracks.count);}-(ID)tempurlForRecording{    NSArray *paths = NSSearchPathForDirectorIEsInDomains(NSdocumentDirectory,NSUserDomainMask,YES);    Nsstring *documentsDirectoryPath = [paths objectAtIndex:0];    Nsstring *path = @"camerabuffer.mp4";    Nsstring *pathCamerainput =[documentsDirectoryPath stringByAppendingPathComponent: path];    NSURL *urlCamerainput = [NSURL fileURLWithPath:pathCamerainput];    return urlCamerainput;}- (voID)dIDReceiveMemoryWarning {    [super dIDReceiveMemoryWarning];    // dispose of any resources that can be recreated.}@end

解决方法 这将帮助您解决这个问题.

[MovIEOutput setMovIEFragmentInterval：kCMTimeInvalID];

我认为这是一个错误.文档说明如果录音未成功完成,则不会写入示例表.所以如果成功完成,它将自动被写入.但现在看来似乎没有.

有任何想法吗？

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