Question

Iam尝试使用ios中的前置摄像头捕获视频并将其转换为图像序列，我正在尝试使用avassetimagegenerator。我刚接触AV基金会，请帮助我，谢谢。

Answer 1

首先出现一个UIImagePickerController

- (void)presentVideoPicker {
    UIImagePickerController *anImagePicker = [[UIImagePickerController alloc] init];
    anImagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;
    anImagePicker.cameraDevice = UIImagePickerControllerCameraDeviceFront;
    anImagePicker.mediaTypes = [[NSArray alloc] initWithObjects: (NSString *)kUTTypeMovie, nil];
    anImagePicker.allowsEditing = YES;
    anImagePicker.delegate = self;

    UIPopoverController *aPopoverController = [[[UIPopoverController alloc] initWithContentViewController:anImagePicker] autorelease];
    [aPopoverController presentPopoverFromRect:self.view.frame inView:[[self view] window]
                          permittedArrowDirections:UIPopoverArrowDirectionAny animated:YES];
}

在UIImagePickerControllerDelegate中捕获视频

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
    NSString *aMediaType = [info objectForKey:UIImagePickerControllerMediaType];

    if ([aMediaType isEqualToString:(NSString *)kUTTypeMovie]) {
        NSURL *aVideoURL = [info objectForKey:UIImagePickerControllerMediaURL];
        [self readMovie:aVideoURL];

        // If you want the Duration fo the Video, Use this
        AVPlayerItem *aPlayerItem = [AVPlayerItem playerItemWithURL:aVideoURL];
        CMTime aDuration = aPlayerItem.duration;
        float anInSeconds = CMTimeGetSeconds(aDuration);
        NSInteger aDuration = nearbyintf(anInSeconds);
    }
}

现在代表您在委托- (void) readMovie:(NSURL *)url

中调用的方法代码

参考此链接： http://www.7twenty7.com/blog/2010/11/video-processing-with-av-foundation

...

为图像生成CVImageBuffer后，

参考 how to convert a CVImageBufferRef to UIImage

将其转换为UIImage

使用ios前置摄像头捕获视频，并使用avassetimagegenerator转换为图像序列

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