同时使用AVCaptureVideoDataOutput和AVCaptureMovieFileOutput
同时使用AVCaptureVideoDataOutput和AVCaptureMovieFileOutput
提问于 2010-10-19 21:32:04
我需要能够让AVCaptureVideoDataOutput和AVCaptureMovieFileOutput同时工作。下面的代码可以工作，但是视频录制不能。在调用startRecordingToOutputFileURL之后直接调用didFinishRecordingToOutputFileAtURL委托。现在，如果我只需注释掉这行代码，就可以从AVCaptureSession中删除AVCaptureVideoDataOutput：
[captureSession addOutput:captureDataOutput];
视频录制可以正常工作，但是SampleBufferDelegate没有被调用(这是我需要的)。
怎样才能让AVCaptureVideoDataOutput和AVCaptureMovieFileOutput同时工作呢？
- (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
}我应该补充说，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
回答 1
Stack Overflow用户
回答已采纳
发布于 2011-02-14 02:35:55
我联系了苹果技术支持的一位工程师，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，但他用了“目前不支持”这个词。
我鼓励你填写一份关于这方面的bug报告/功能请求，就像我做的(bugreport.apple.com)一样，因为他们衡量了人们想要的东西有多难，我们可能会在不久的将来看到这一点。
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原文链接：
https://stackoverflow.com/questions/3968879
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