如何保存电影从AVCapture(How to save a movie from AVCaptur

我一直在试图找出AVCapture的最后几天，我在努力保存视频。我的理解是，你调用[movieFileOutput startRecordingToOutputFileURL:outputURL recordingDelegate:self]; 然后在以后的时间，你可以调用[movieFileOutput stopRecording]; 它应该然后调用委托方法-(void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error{ 。从那以后，我应该可以保存电影的东西，如UISaveVideoAtPathToSavedPhotosAlbum([outputFileURL path] ,nil,nil,nil); 但显然我没有做正确。当我启动会话，然后startRecordingToOutputFile立即调用委托didFinishRecording 。我想不通为什么。下面是我的代码：

-(void)viewDidAppear:(BOOL)animated{
        [super viewDidAppear:animated];
        session = [[AVCaptureSession alloc] init];
        [session beginConfiguration];
        session.sessionPreset = AVCaptureSessionPresetMedium;

        AVCaptureVideoPreviewLayer *captureVideoPreviewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
    captureVideoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
    captureVideoPreviewLayer.frame = self.imagePreview.bounds; //UIView *imagePreview
    [self.imagePreview.layer addSublayer:captureVideoPreviewLayer];

    AVCaptureDevice *device = [self getCamera];
    NSError *error = nil;
    AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error];
    if (!input) {
        // Handle the error appropriately.
        NSLog(@"ERROR: trying to open camera: %@", error);
    }

    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *documentsDirectoryPath = [paths objectAtIndex:0];

    movieFileOutput = [[AVCaptureMovieFileOutput alloc] init];

    NSString *archives = [documentsDirectoryPath stringByAppendingPathComponent:@"archives"];
    NSString *outputpathofmovie = [[archives stringByAppendingPathComponent:@"Test"] stringByAppendingString:@".mp4"];
    NSURL *outputURL = [[NSURL alloc] initFileURLWithPath:outputpathofmovie];

    [session addInput:input];
    [session addOutput:movieFileOutput];
    [session commitConfiguration];
    [session startRunning];
    [movieFileOutput startRecordingToOutputFileURL:outputURL recordingDelegate:self];
    [NSTimer timerWithTimeInterval:7 target:self selector:@selector(stopRun) userInfo:nil repeats:NO];
    /*
    [self initializeCamera];
     */
}
 -(void)stopRun{
        [movieFileOutput stopRecording];
    }

-(void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error{
    NSLog(@"capture done url: %@",outputFileURL);
    UISaveVideoAtPathToSavedPhotosAlbum([outputFileURL path] ,nil,nil,nil);
}

-(AVCaptureDevice*)getCamera{
    NSArray *devices = [AVCaptureDevice devices];
    AVCaptureDevice *frontCamera;
    AVCaptureDevice *backCamera;
    for (AVCaptureDevice *device in devices) {
        NSLog(@"Device name: %@", [device localizedName]);
        if ([device hasMediaType:AVMediaTypeVideo]) {
            if ([device position] == AVCaptureDevicePositionBack) {
                NSLog(@"Device position : back");
                backCamera = device;
            }
            else {
                NSLog(@"Device position : front");
                frontCamera = device;
            }
        }
    }
    return frontCamera;
}

遗憾的是，它是如此漫长。我希望有很多的代码都可以给别人有用。

免责声明：我不是一个Objective C程序员，它的唯已经15天了我第一次开始阅读关于语言本身。

我必须做同样的事情。这里是低于该为我工作的代码。我从developer.apple.com不同的堆栈溢出的问题和实例grabed它。我注释掉我没有需要为我的工作原型代码。你可以玩它。

-(void) saveRecordingLocally
{
    dispatch_async([self sessionQueue], ^{
        if (![[self movieFileOutput] isRecording])
        {
            if ([[UIDevice currentDevice] isMultitaskingSupported])
            {
                // Setup background task. This is needed because the captureOutput:didFinishRecordingToOutputFileAtURL: callback is not received until AVCam returns to the foreground unless you request background execution time. This also ensures that there will be time to write the file to the assets library when AVCam is backgrounded. To conclude this background execution, -endBackgroundTask is called in -recorder:recordingDidFinishToOutputFileURL:error: after the recorded file has been saved.
                [self setBackgroundRecordingID:[[UIApplication sharedApplication] beginBackgroundTaskWithExpirationHandler:nil]];
            }

            // Update the orientation on the movie file output video connection before starting recording.
//          [[[self movieFileOutput] connectionWithMediaType:AVMediaTypeVideo] setVideoOrientation:[[(AVCaptureVideoPreviewLayer *)[[self previewView] layer] connection] videoOrientation]];

            // Turning OFF flash for video recording
            //[AVCamViewController setFlashMode:AVCaptureFlashModeOff forDevice:[[self videoDeviceInput] device]];

            // Start recording to a temporary file.
            NSString *outputFilePath = [NSTemporaryDirectory() stringByAppendingPathComponent:[@"movie" stringByAppendingPathExtension:@"mov"]];
            [[self movieFileOutput] startRecordingToOutputFileURL:[NSURL fileURLWithPath:outputFilePath] recordingDelegate:self];
        }
    });
}

//delegate
-(void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)connections error:(NSError *)error
{
    NSLog(@"OutputFileUrl %@", outputFileURL);
    if(error){
        NSLog(@"ERROR : %@", error);
    }
    UIBackgroundTaskIdentifier backgroundRecordingID = [self backgroundRecordingID];
    [self setBackgroundRecordingID:UIBackgroundTaskInvalid];
    [[[ALAssetsLibrary alloc] init] writeVideoAtPathToSavedPhotosAlbum:outputFileURL completionBlock:^(NSURL *assetURL, NSError *error) {
        if (error)
            NSLog(@"%@", error);

        [[NSFileManager defaultManager] removeItemAtURL:outputFileURL error:nil];

        if (backgroundRecordingID != UIBackgroundTaskInvalid)
            [[UIApplication sharedApplication] endBackgroundTask:backgroundRecordingID];
    }];
}