我正在使用WKWebView在我的应用程序中显示全屏YouTube视频,并使用AVCaptureSession在YouTube上浏览和播放视频时在后台录制音频和视频.按下按钮时捕获会话开始.但是,在录制过程中,当选择YouTube视频并开始全屏播放时,它会立即意外结束录制,因为会调用处理录制结束的委托方法.
请有人向我解释如何解决这个问题？不太确定这是否完全相关,但我收到错误信息,如_BSMachError：(os / kern)无效功能(20)_BSMachError：(os / kern)无效名称(15)和无法同时满足约束.,尽管后者似乎引用了一个单独的AutoLayout问题.任何帮助将不胜感激.
此外,我尝试使用UIWebView而不是WKWebView.当我使用UIWebView时,问题是视频录制时YouTube视频甚至无法播放.它将在黑屏上打开并保持在0:00.
这是按下以开始录制的按钮.
- (void) buttonClickedStart:(UIButton*)sender //button to start/end recording {
if (!WeAreRecording) {
[self setupVideoCapture];
//----- START RECORDING -----
WeAreRecording = YES;
[[AVAudioSession sharedInstance] setCategory:AVAudioSessionCategoryRecord error:nil];
//Create temporary URL to record the video to for later viewing
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,NSUserDomainMask,YES);
NSString *basePath = [paths objectAtIndex:0];
NSString *outputPath = [[NSString alloc] initWithFormat:@"%@",[basePath stringByAppendingPathComponent:@"output.mp4"]];
if ([[NSFileManager defaultManager] isDeletableFileAtPath:outputPath])
[[NSFileManager defaultManager] removeItemAtPath:outputPath error:NULL];
NSURL *outputURL = [[NSURL alloc] initFileURLWithPath:outputPath];
[MovieFileOutput startRecordingToOutputFileURL:outputURL recordingDelegate:self];
self.outputURLs = outputURL;
}
else {
//----- STOP RECORDING -----
WeAreRecording = NO;
[MovieFileOutput stopRecording];
}
}
这是按下按钮时调用的方法.它设置并启动表示为CaptureSession的捕获会话.
- (void)setupVideoCapture {
// Sets up recording capture session
CaptureSession = [[AVCaptureSession alloc] init];
// Add video input to capture session
AVCaptureDevice *VideoDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
if (VideoDevice) {
NSError *error;
VideoInputDevice = [[AVCaptureDeviceInput alloc] initWithDevice:[self CameraWithPosition:AVCaptureDevicePositionFront] error:&error];
if (!error) {
if ([CaptureSession canAddInput:VideoInputDevice])
[CaptureSession addInput:VideoInputDevice];
}
}
// Add audio input to capture session
AVCaptureDevice *audioCaptureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeAudio];
NSError *error = nil;
AVCaptureDeviceInput *audioInput = [AVCaptureDeviceInput deviceInputWithDevice:audioCaptureDevice error:&error];
if (audioInput) {
[CaptureSession addInput:audioInput];
}
// Add movie file output to the capture session
MovieFileOutput = [[AVCaptureMovieFileOutput alloc] init];
[MovieFileOutput setMovieFragmentInterval:kCMTimeInvalid];
if ([CaptureSession canAddOutput:MovieFileOutput])
[CaptureSession addOutput:MovieFileOutput];
// Set the output properties (you don't really need to see this code)
[self CameraSetOutputProperties]; // (We call a method as it also has to be done after changing camera)
[CaptureSession setSessionPreset:AVCaptureSessionPresetMedium];
//----- START THE CAPTURE SESSION RUNNING -----
[CaptureSession startRunning];
}
这是声明和设置WKWebView的地方.
- (void)viewDidAppear:(BOOL)animated {
[super viewDidAppear:animated];
// Add recording button
CGSize screenSize = [[UIScreen mainScreen] bounds].size;
CGRect rect = CGRectMake(0,screenSize.width,337);
UIButton *start = [UIButton buttonWithType:UIButtonTypeRoundedRect];
[start addTarget:self action:@selector(buttonClickedStart:) forControlEvents:UIControlEventTouchUpInside];
[start setFrame:CGRectMake(30,338,35,35)];
[start setTitle:@"" forState:UIControlStateNormal];
[start setExclusiveTouch:YES];
[start setBackgroundImage:[UIImage imageNamed:@"start.png"] forState:UIControlStateNormal];
[self.view addSubview:start];
// Add web view
webView = [[WKWebView alloc] initWithFrame:rect];
[self.view addSubview:webView];
NSString *webSite = @"http://www.youtube.com";
NSURL *url = [NSURL URLWithString:webSite];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
webView.navigationDelegate = self;
webView.UIDelegate = self;
[webView loadRequest:request]; // Load up Youtube
[self.view addSubview:webView];
}
