How to copy video from iPhone album without compression? - ios

Question

When I tried to copy a video from album to app using UIImagePickerController, the video is compressed.
When the video imported via Photos app on Mac, the ten-second long video is:
1920x1280 ~22MB
After the video is imported into app, then copied via iTunes Sharing, the compressed video is:
1280x720 ~6.3MB
How can I import video into app in original resolution and quality?
Code:
- (void)importVideo:(id)sender {
UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
imagePickerController.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
imagePickerController.mediaTypes = [[NSArray alloc] initWithObjects: (NSString *) kUTTypeMovie, nil];
imagePickerController.allowsEditing = YES;
imagePickerController.delegate = self;
[self presentViewController:imagePickerController animated:YES completion:nil];
}
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info {
NSString *mediaType = [info objectForKey: UIImagePickerControllerMediaType];
[self dismissViewControllerAnimated:YES completion:nil];
if (CFStringCompare((__bridge_retained CFStringRef)mediaType, kUTTypeMovie, 0) == kCFCompareEqualTo) {
NSURL *videoURL = [info objectForKey:UIImagePickerControllerMediaURL];
NSData *videoData = [NSData dataWithContentsOfURL:videoURL];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *folder = [paths firstObject];
NSString *filename = [folder stringByAppendingPathComponent:self.uniqueFilename];
BOOL success = [videoData writeToFile:filename atomically:NO];
NSLog(#"Write to file %#", success ? #"OK" : #"Error");
}
}

Answer 1

Once a PHAsset is obtained via GMImagePicker, it can be saved by:
for (PHAsset *asset in assetArray) {
PHVideoRequestOptions *options = [[PHVideoRequestOptions alloc] init];
options.version = PHVideoRequestOptionsVersionOriginal;
[[PHImageManager defaultManager] requestAVAssetForVideo:asset
options:options
resultHandler:^(AVAsset *avAsset, AVAudioMix *audioMix, NSDictionary *info) {
if ([avAsset isKindOfClass:[AVURLAsset class]]) {
NSURL *videoURL = [(AVURLAsset *) avAsset URL];
NSData *videoData = [NSData dataWithContentsOfURL:videoURL];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *folder = [paths firstObject];
NSString *filename = [folder stringByAppendingPathComponent:#"foo.mp4"];
[videoData writeToFile:filename atomically:NO];
}
}];
}