在 iPhone 中捕捉视频和图像

Question

我正在使用 ImagePickerController 进行视频捕获。我还需要将捕获视频保存为图像。

所以我选择了 AVCaptureSession 来捕获图像。我无法运行 AVCaptureSession 以及 ImagePickerController。所以我需要将 ImagePickerController 作为 AVCaptureSession 的输入。

但我不知道该怎么做。请帮助我..并建议我正确的方法。

Answer 1

我只找到这两个。希望它有帮助。

http://www.iphonedevsdk。 com/forum/iphone-sdk-development/24025-uiimagepickercontroller-videorecording-iphone-3gs.html

UIImagePickerController：从视频中获取图像

Answer 2

我遇到了同样的问题..我确实对图像和视频进行了处理，并使用下面的代码进行图像捕获：

- (void) snapImage: (id) sendern
{
    UIImagePickerController *ipc = [[UIImagePickerController alloc] init];
    ipc.sourceType =  UIImagePickerControllerSourceTypeCamera;
    ipc.delegate = self;
    ipc.allowsImageEditing = YES;
    [self presentModalViewController:ipc animated:YES]; 

}

对于视频录制，我使用了下面的代码：

- (void) recordVideo: (id) sender
{
    UIImagePickerController *ipc = [[UIImagePickerController alloc] init];
    ipc.sourceType =  UIImagePickerControllerSourceTypeCamera;
    ipc.delegate = self;
    ipc.allowsEditing = YES;
    ipc.videoQuality = UIImagePickerControllerQualityTypeMedium;
    ipc.videoMaximumDuration = 30.0f; // 30 seconds
    ipc.mediaTypes = [NSArray arrayWithObject:@"public.movie"];
    // ipc.mediaTypes = [NSArray arrayWithObjects:@"public.movie", @"public.image", nil];
    [self presentModalViewController:ipc animated:YES]; 
}

希望会对您有所帮助。

Answer 3

    - (IBAction) useCamera: (id)sender
    {
        if ([UIImagePickerController isSourceTypeAvailable:
             UIImagePickerControllerSourceTypeCamera])
        {
            UIImagePickerController *imagePicker =
            [[UIImagePickerController alloc] init];
            imagePicker.delegate = self;
            imagePicker.sourceType =
            UIImagePickerControllerSourceTypeCamera;
            imagePicker.mediaTypes = [NSArray arrayWithObjects:
                                      (NSString *) kUTTypeImage,
                                      nil];
            imagePicker.allowsEditing = NO;
            [self presentModalViewController:imagePicker
                                    animated:YES];
            newMedia = YES;
        }
    }

-(void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    [self.popoverController dismissPopoverAnimated:true];

    NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
    [self dismissModalViewControllerAnimated:YES];
    if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) 
    {
    UIImage *image = [info objectForKey:UIImagePickerControllerOriginalImage];
    imageView.image = image;
        if (newMedia)
            UIImageWriteToSavedPhotosAlbum(image, self,  
                                           @selector(image:finishedSavingWithError:contextInfo:),nil);
    }

}
-(void)image:(UIImage *)image
finishedSavingWithError:(NSError *)error
 contextInfo:(void *)contextInfo
{
    if (error) 
    {
        UIAlertView *alert = [[UIAlertView alloc]
                              initWithTitle: @"Save failed"
                              message: @"Failed to save image"
                              delegate: self
                              cancelButtonTitle:@"OK"
                              otherButtonTitles:nil];
        [alert show];

    }
}

Answer 4

与 AVFoundation 相关的 Apple 文档和示例代码有几个错误。请参阅 iOS 4：使用 AVFoundation 拍摄实时预览照片，了解实际从实时预览。