Do not compress video when I select a video

问题:

I am making Video Upload App in IOS. I got a problem on UIImagePickerController.

That is, When I whenever select a Movie, It compressed automatically.

I had tried every VideoQuality Options. (High, Medium, Low)

Do I use other Controller or my own Controller?

A short video(5 minutes) compression spends very long time(several minutes) on my iPhone(4S).

I think that my app supports over 10 minute video at least.

My Code are like this.

- (void)showImagePicker:(UIImagePickerControllerSourceType)sourceType
{   
    if ([UIImagePickerController isSourceTypeAvailable:sourceType]) {
        [picker setSourceType:sourceType];
        [picker setMediaTypes:[NSArray arrayWithObject:(NSString *)kUTTypeMovie]];
        // Video Quality Setting..
        [picker setVideoQuality:UIImagePickerControllerQualityTypeHigh];
        [self presentModalViewController:picker animated:YES];
    }
}

- (IBAction)showLibrary:(id)sender
{
    [self showImagePicker:UIImagePickerControllerSourceTypeSavedPhotosAlbum];
}

- (IBAction)showCamera:(id)sender
{
    [self showImagePicker:UIImagePickerControllerSourceTypeCamera];
}