Question

我通过使用cameraOverlayView选项在其上放置视频来录制视频，而录制时则显示我的视图，但当我尝试保存并观看时，视图不会出现。

有人可以帮我解决这个问题吗？

提前致谢。

Answer 1

我担心这不会那么容易。您必须使用AVCaptureSession类实际捕获单个帧。然后，您可以在捕获图像时将叠加视图合成到图像上，然后将合成图提供给AVCaptureDevice。

它非常复杂。以下是一些用于设置捕获的代码，以帮助您入门：

// Create and configure a capture session and start it running

- （void）setupCaptureSession { NSError * error = nil;

// Create the session
session = [[AVCaptureSession alloc] init]; // note we never release this...leak?

// Configure the session to produce lower resolution video frames, if your 
// processing algorithm can cope. We'll specify medium quality for the
// chosen device.
session.sessionPreset = AVCaptureSessionPresetLow; // adjust this! AVCaptureSessionPresetLow

// Find a suitable AVCaptureDevice
AVCaptureDevice *device = [AVCaptureDevice
                           defaultDeviceWithMediaType:AVMediaTypeVideo];

// Create a device input with the device and add it to the session.
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device 
                                                                    error:&error];
if (!input) {
    // Handling the error appropriately.
    NSLog(@"Yikes, null input");
}
[session addInput:input];

// Create a VideoDataOutput and add it to the session
AVCaptureVideoDataOutput *output = [[[AVCaptureVideoDataOutput alloc] init] autorelease];
output.alwaysDiscardsLateVideoFrames = YES; // cribbed this from somewhere -- seems related to our becoming unrepsonsive

[session addOutput:output];

if (!output) {
    // Handling the error appropriately.
    NSLog(@"ERROROROROR");
}

// Configure your output.
dispatch_queue_t queue = dispatch_queue_create("myQueue", NULL);
[output setSampleBufferDelegate:self queue:queue];
dispatch_release(queue);

// Specify the pixel format

// kCVPixelFormatType_32RGBA or kCVPixelFormatType_32BGRA
output.videoSettings = 
[NSDictionary dictionaryWithObject:
 [NSNumber numberWithInt:kCVPixelFormatType_32BGRA] 
                            forKey:(id)kCVPixelBufferPixelFormatTypeKey];


// If you wish to cap the frame rate to a known value, such as 15 fps, set 
// minFrameDuration.
output.minFrameDuration = CMTimeMake(1, VIDEO_CAPTURE_FRAMERATE); // WATCH THIS!

NSNotificationCenter *notify = [NSNotificationCenter defaultCenter];
[notify addObserver: self selector: @selector(onVideoError:) name: AVCaptureSessionRuntimeErrorNotification object: session];
[notify addObserver: self selector: @selector(onVideoInterrupted:) name: AVCaptureSessionWasInterruptedNotification object: session];
[notify addObserver: self selector: @selector(onVideoEnded:) name: AVCaptureSessionInterruptionEndedNotification object: session];
[notify addObserver: self selector: @selector(onVideoDidStopRunning:) name: AVCaptureSessionDidStopRunningNotification object: session];
[notify addObserver: self selector: @selector(onVideoStart:) name: AVCaptureSessionDidStartRunningNotification object: session];

}

自定义视频

1 个答案: