iphone - 同时实现AVCaptureVideoDataOutput和AVCaptureMovieFileOutput

我需要能够同时工作AVCaptureVideoDataOutput和AVCaptureMovieFileOutput。以下代码有效，但是视频记录无效。在调用didFinishRecordingToOutputFileAtURL之后，将直接调用startRecordingToOutputFileURL委托(delegate)。现在，如果我从
只需注释掉以下行即可生成AVCaptureVideoDataOutput:
AVCaptureSession
视频录制有效，但是没有调用SampleBufferDelegate(我需要)。

我该如何使[captureSession addOutput:captureDataOutput];和AVCaptureVideoDataOutput同时工作。

- (void)initCapture {
 AVCaptureDeviceInput *captureInput = [AVCaptureDeviceInput deviceInputWithDevice:[AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo] error:NULL];

 captureDataOutput = [[AVCaptureVideoDataOutput alloc] init];
 [captureDataOutput setSampleBufferDelegate:self queue:dispatch_get_main_queue()];

 m_captureFileOutput = [[AVCaptureMovieFileOutput alloc] init];

 NSString* key = (NSString*)kCVPixelBufferPixelFormatTypeKey;
 NSNumber* value = [NSNumber numberWithUnsignedInt:kCVPixelFormatType_32BGRA];
 NSDictionary* videoSettings = [NSDictionary dictionaryWithObject:value forKey:key];

 [captureDataOutput setVideoSettings:videoSettings];

 captureSession = [[AVCaptureSession alloc] init];

 [captureSession addInput:captureInput];
 [captureSession addOutput:m_captureFileOutput];
 [captureSession addOutput:captureDataOutput];

 [captureSession beginConfiguration];
 [captureSession setSessionPreset:AVCaptureSessionPresetLow];
 [captureSession commitConfiguration];

 [self performSelector:@selector(startRecording) withObject:nil afterDelay:10.0];
 [self performSelector:@selector(stopRecording) withObject:nil afterDelay:15.0];

 [captureSession startRunning];
}


- (void) startRecording
{
    [m_captureFileOutput startRecordingToOutputFileURL:[self tempFileURL] recordingDelegate:self];

}

- (void) stopRecording
{
    if([m_captureFileOutput isRecording])
 [m_captureFileOutput stopRecording];

}


- (NSURL *) tempFileURL
{
 NSString *outputPath = [[NSString alloc] initWithFormat:@"%@%@", NSTemporaryDirectory(), @"camera.mov"];
 NSURL *outputURL = [[NSURL alloc] initFileURLWithPath:outputPath];
 NSFileManager *fileManager = [NSFileManager defaultManager];
 if ([fileManager fileExistsAtPath:outputPath]) {
  [[NSFileManager defaultManager] removeItemAtPath:outputPath error:nil];
 [outputPath release];
 return [outputURL autorelease];
}



- (void)captureOutput:(AVCaptureFileOutput *)captureOutput didStartRecordingToOutputFileAtURL:(NSURL *)fileURL fromConnections:(NSArray *)connections
{
 NSLog(@"start record video");
}

- (void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error
{
 NSLog(@"end record");
}


- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection
{
      // do stuff with sampleBuffer
}

我应该补充，我得到了错误:

Error Domain=NSOSStatusErrorDomain Code=-12780 "The operation couldn’t be completed. (OSStatus error -12780.)" UserInfo=0x23fcd0 {AVErrorRecordingSuccessfullyFinishedKey=false}

从

- (void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error

干杯

最佳答案

我已经联系了Apple支持的工程师，他告诉我不支持同时使用AVCaptureVideoDataOutput + AVCaptureMovieFileOutput。我不知道他们将来是否会支持它，但是他使用了“目前不支持”这个词。

我鼓励您像我一样(bugreport.apple.com)填写有关此问题的错误报告/功能请求，因为它们可以衡量人们对某些东西的渴望程度，我们可能会在不久的将来看到这一点。