我有一个应用程序，当加载视图时，开始捕获视频和音频，并在完成后将其记录到该应用程序的文档文件夹以及运行它的iPad的相机胶卷中。我已确保为会话添加了音频和视频的输入，但是当我查看保存的视频时，其中没有音频。是否有人能在我的代码中找到任何问题呢？
更新：从未显示任何错误消息。但是，我找到了一个共同点。如果录制时间超过10秒，音频就不会记录。NSLog显示：
“Finished with error: (null)”
更新：从未显示任何错误消息。但是，我找到了一个共同点。如果录制时间超过10秒，音频就不会记录。NSLog显示：
“Finished with error: (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));
}
audioInput，但从未检查error2。考虑到audioInput是你遇到问题的地方，这不是一个合理的建议吗？ - jaket