AVCaptureVideoDataOutput的问题

Question

- (void)captureOutput:(AVCaptureOutput )captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection )connection

这个代理方法偶尔会发生crash

相关代码

// - (AVCaptureVideoDataOutput *)captureDataOutput {

if (!_captureDataOutput) {
    _captureDataOutput = [[AVCaptureVideoDataOutput alloc] init];
    _captureDataOutput.alwaysDiscardsLateVideoFrames = YES;
    _sessionQueue = dispatch_queue_create("cameraQueue", NULL);
    [_captureDataOutput setSampleBufferDelegate:self queue:_sessionQueue];
    NSString* formatKey = (NSString*)kCVPixelBufferPixelFormatTypeKey;
    NSNumber* value = [NSNumber numberWithUnsignedInt:kCVPixelFormatType_32BGRA];
    NSDictionary* videoSettings = [NSDictionary dictionaryWithObject:value forKey:formatKey];
    [_captureDataOutput setVideoSettings:videoSettings];
}
return _captureDataOutput;

}

Answer 1

这个问题困扰我很长时间了 但是就是不知道问题根源 望大神搭救