Question

我有一个应用程序，当视图加载时，开始捕获视频和音频，完成后，将其记录到应用程序的文档文件夹，以及运行它的iPad的相机胶卷。我已经确定并在会话的输入中添加了音频和视频，但是当我去查看保存的视频时，没有音频。任何人都可以在我的代码中发现任何可以指出问题出在哪里的东西吗？

更新：没有显示任何错误消息。但是，我发现了一个共同点。音频将录制，但仅限于录制时间为10秒或更短。如果它达到11秒，则音频不会录制。

NSLog显示

完成错误：（null）

-(void)viewWillAppear:(BOOL)animated {
    NSDate *today = [NSDate date];
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"MMM d hh:mm:ss a"];
    // display in 12HR/24HR (i.e. 11:25PM or 23:25) format according to User Settings
    NSString *currentTime = [dateFormatter stringFromDate:today];
    NSError* error4 = nil;
    AVAudioSession* audioSession = [AVAudioSession sharedInstance];
    [audioSession setCategory:AVAudioSessionCategoryAmbient error:&error4];
    OSStatus propertySetError = 0;
    UInt32 allowMixing = true;
    propertySetError |= AudioSessionSetProperty(kAudioSessionProperty_OtherMixableAudioShouldDuck, sizeof(allowMixing), &allowMixing);

    // Activate the audio session
    error4 = nil;
    if (![audioSession setActive:YES error:&error4]) {
        NSLog(@"AVAudioSession setActive:YES failed: %@", [error4 localizedDescription]);
    }
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectoryPath = [paths objectAtIndex:0];

    session = [[AVCaptureSession alloc] init];
    [session beginConfiguration];
    session.sessionPreset = AVCaptureSessionPresetMedium;
    self.navigationController.navigationBarHidden = YES;

    NSError *error = nil;

    AVCaptureDevice *audioCaptureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];
    NSError *error2 = nil;
    AVCaptureDeviceInput *audioInput = [AVCaptureDeviceInput deviceInputWithDevice:audioCaptureDevice error:&error2];


    AVCaptureDevice *device;
    AVCaptureDevicePosition desiredPosition = AVCaptureDevicePositionBack;
    // find the front facing camera

    device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];


    // get the input device
    AVCaptureDeviceInput *deviceInput = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error];




    AVCaptureMovieFileOutput *movieFileOutput = [[AVCaptureMovieFileOutput alloc] init];

    NSString *archives = [documentsDirectoryPath stringByAppendingPathComponent:@"archives"];
    NSString *editedfilename = [[@"ComeOnDown" lastPathComponent] stringByDeletingPathExtension];
    NSString *datestring = [[editedfilename stringByAppendingString:@" "] stringByAppendingString:currentTime];
    NSLog(@"%@", datestring);
    NSString *outputpathofmovie = [[archives stringByAppendingPathComponent:datestring] stringByAppendingString:@".mp4"];
    NSURL *outputURL = [[NSURL alloc] initFileURLWithPath:outputpathofmovie];
    [session addInput:audioInput];
    [session addInput:deviceInput];
    [session addOutput:movieFileOutput];
    [session commitConfiguration];
    [session startRunning];




    AVCaptureVideoPreviewLayer *previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
    previewLayer.backgroundColor = [[UIColor blackColor] CGColor];
    previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
    previewLayer.connection.videoOrientation = AVCaptureVideoOrientationLandscapeRight;

     CALayer *rootLayer = [vImagePreview layer];
    [rootLayer setMasksToBounds:YES];
    [previewLayer setFrame:[rootLayer bounds]];
    [rootLayer addSublayer:previewLayer];

    [movieFileOutput startRecordingToOutputFileURL:outputURL recordingDelegate:self];



    //session = nil;
    if (error) {
        UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:
                                  [NSString stringWithFormat:@"Failed with error %d", (int)[error code]]
                                                            message:[error localizedDescription]
                                                           delegate:nil
                                                  cancelButtonTitle:@"Dismiss"
                                                  otherButtonTitles:nil];
        [alertView show];

    }
    [super viewWillAppear:YES];

}

-(void)captureOutput:(AVCaptureFileOutput *)captureOutput didStartRecordingToOutputFileAtURL:(NSURL *)fileURL fromConnections:(NSArray *)connections {

}
-(void)video:(NSString *)videoPath didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{
    NSLog(@"Finished with error: %@", error);
}
- (void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error {
    //finished
    NSLog(@"Finished");
    NSString *proud = [[NSString alloc] initWithString:[outputFileURL path]];
    UISaveVideoAtPathToSavedPhotosAlbum(proud, self, @selector(video:didFinishSavingWithError: contextInfo:), (__bridge void *)(proud));
}

Answer 1

答案是movieFileOutput.movieFragmentInterval = kCMTimeInvalid;显然它设置为10默认值，之后的任何内容，音频都不会记录。参考AVCaptureSession audio doesn't work for long videos

一旦我发现时间与问题有关，很容易找到答案

Answer 2

videoFileOutput.movieFragmentInterval = kCMTimeInvalid

为我解决了这个问题。

但是，在调用startRecordingToOutputFileURL后，我不小心设置了movieFragmentInterval。痛苦的一小时后，我意识到自己的错误。对于像我这样的新手 - 请注意这个显而易见的序列。

videoFileOutput.movieFragmentInterval = kCMTimeInvalid
videoFileOutput.startRecordingToOutputFileURL(filePath, recordingDelegate: recordingDelegate)

Answer 3

Swift 4.2

movieFileOutput.movieFragmentInterval = CMTime.invalid

音频不在AVCaptureSession中录制

3 个答案: