Question

我已经通过avcapturesession实现了视频和音频录制。通常大约需要1到2秒钟才能开始录制。

如果需要更多信息，请随意发表评论。设置捕获会话执行以下步骤：

添加捕获会话
添加视频输入
添加音频输入
添加视频预览层
添加电影输出
设置摄像机配置以进行输出连接

开始捕获会话

-（void）setupCaptureSession {

 // Set up capture session
     captureSession = [AVCaptureSession new];

//add video intput
AVCaptureDevice *videoCaptureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

   if (videoCaptureDevice) {
    NSError *error;

    videoInputDevice =  [AVCaptureDeviceInput deviceInputWithDevice:videoCaptureDevice error:&error];
    if(!error){
        if ([captureSession canAddInput:videoInputDevice]) {
            [captureSession addInput:videoInputDevice];
        }else{
            NSLog(@"Failed to add video input");
        }
    }else{
        NSLog(@"Failed to create video device");
    }
}else{
    NSLog(@"Failed to create video capture device");
}

// add audio input
AVCaptureDevice *audioCaptureDevie = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];

NSError *error = nil;

AVCaptureDeviceInput *audioInputDevice = [AVCaptureDeviceInput deviceInputWithDevice:audioCaptureDevie error:&error];
if (audioInputDevice) {
    [captureSession addInput:audioInputDevice];
}

// add outputs

// add video preview layer
NSLog(@"Adding video preview layer");

[self setPreviewLayer:[[AVCaptureVideoPreviewLayer alloc] initWithSession:captureSession]];

[[self previewLayer] setVideoGravity:AVLayerVideoGravityResizeAspectFill];

//add movie ouput
movieFileOutput = [[AVCaptureMovieFileOutput alloc] init];
movieFileOutput.minFreeDiskSpaceLimit = 1024 * 1024;

if ([captureSession canAddOutput:movieFileOutput])
    [captureSession addOutput:movieFileOutput];

// set up camera configuration for output connection
[self setUpCameraConfiguration];

[captureSession setSessionPreset:AVCaptureSessionPresetMedium];
if ([captureSession canSetSessionPreset:AVCaptureSessionPreset640x480])
    [captureSession setSessionPreset:AVCaptureSessionPreset640x480];



//----- DISPLAY THE PREVIEW LAYER -----
//Display it full screen under out view controller existing controls
NSLog(@"Display the preview layer");
CGRect layerRect = [[[self view] layer] bounds];
[_previewLayer setBounds:layerRect];
[_previewLayer setPosition:CGPointMake(CGRectGetMidX(layerRect),
                                       CGRectGetMidY(layerRect))];
//[[[self view] layer] addSublayer:[[self CaptureManager] previewLayer]];
//We use this instead so it goes on a layer behind our UI controls (avoids us having to manually bring each control to the front):
UIView *cameraView = [[UIView alloc] init];
[[self view] addSubview:cameraView];
[self.view sendSubviewToBack:cameraView];

[[cameraView layer] addSublayer:_previewLayer];


//----- START THE CAPTURE SESSION RUNNING -----
[captureSession startRunning];

}

单击开始录制时如何以相同的时间间隔开始录制视频？

0 个答案: