我需要能够让AVCaptureVideoDataOutput
和AVCaptureMovieFileOutput
同时工作。以下代码有效,但视频录制没有。调用didFinishRecordingToOutputFileAtURL
后直接调用startRecordingToOutputFileURL
委托。现在,如果我从中移除AVCaptureVideoDataOutput
AVCaptureSession
只需注释掉该行:
[captureSession addOutput:captureDataOutput];
视频录制有效,但未调用SampleBufferDelegate(我需要)。
如何让AVCaptureVideoDataOutput
和AVCaptureMovieFileOutput
同时工作?
- (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
}
我应该添加我收到错误:
Error Domain=NSOSStatusErrorDomain Code=-12780 "The operation couldn’t be completed. (OSStatus error -12780.)" UserInfo=0x23fcd0 {AVErrorRecordingSuccessfullyFinishedKey=false}
这
- (void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error
干杯
答案 0 :(得分:33)
我在Apple的支持下联系了一位工程师,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,但他使用了“目前不支持”这个词。
我鼓励你像我一样填写错误报告/功能请求(bugreport.apple.com),因为它们衡量人们想要的东西,我们也许可以在不久的将来看到这一点。
答案 1 :(得分:3)
虽然您无法使用AVCaptureVideoDataOutput
,但可以与AVCaptureVideoPreviewLayer
同时使用AVCaptureMovieFileOutput
。参见" AVCam" Apple网站上的示例。
在Xamarin.iOS中,代码如下所示:
var session = new AVCaptureSession();
var camera = AVCaptureDevice.DefaultDeviceWithMediaType(AVMediaType.Video);
var mic = AVCaptureDevice.DefaultDeviceWithMediaType(AVMediaType.Audio);
if(camera == null || mic == null){
throw new Exception("Can't find devices");
}
if(session.CanAddInput(camera)){
session.AddInput(camera);
}
if(session.CanAddInput(mic)){
session.AddInput(mic);
}
var layer = new AVCaptureVideoPreviewLayer(session);
layer.LayerVideoGravity = AVLayerVideoGravity.ResizeAspectFill;
layer.VideoGravity = AVCaptureVideoPreviewLayer.GravityResizeAspectFill;
cameraView = new UIView();
cameraView.Layer.AddSublayer(layer);
var filePath = System.IO.Path.Combine( Path.GetTempPath(), "temporary.mov");
var fileUrl = NSUrl.FromFilename( filePath );
var movieFileOutput = new AVCaptureMovieFileOutput();
var recordingDelegate = new MyRecordingDelegate();
session.AddOutput(movieFileOutput);
movieFileOutput.StartRecordingToOutputFile( fileUrl, recordingDelegate);
答案 2 :(得分:0)
9年后的今天,苹果公司似乎并不希望它能够协同工作。
但是您可以轻松地使用AVAssetWriter。
您不能同时使用AVCaptureVideoDataOutput和AVCaptureMovieFileOutput。但是您可以使用AVCaptureVideoDataOutput并对数据进行分析或修改,然后使用AVAsseWriter将帧写入文件。
来源:https://developer.apple.com/forums/thread/98113
如何使用AVAssetWriter保存带输出的视频:
Save AVCaptureVideoDataOutput to movie file using AVAssetWriter in Swift