Capture video using ios front camera and convert into sequence of image using avassetimagegenerator

Question

Iam trying to capture video using front camera in ios and convert that into sequence of images I am trying to use avassetimagegenerator for that . Iam new to AV Foundation please help me in this , thanks .

Answer 1

First present an 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];
}

Capture the Video in UIImagePickerControllerDelegate

- (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);
    }
}

Now code for the Method you called in the Delegate - (void) readMovie:(NSURL *)url

Refer this link: http://www.7twenty7.com/blog/2010/11/video-processing-with-av-foundation

...

Once you generate the CVImageBuffer for an Image,

Refer how to convert a CVImageBufferRef to UIImage

to convert it to UIImage