How to get just a single image from a video? - ios

Question

I've been going through many codes on it but I've not found a working solution yet. I'm using Xcode 5.1.1 and Iphone Retina 4inch.I want to get a single image from a video by clicking on it. After that, I'll edit the image and apply the effects to entire video. Thank you.
UPDATE:
I've found this code for the same purpose. It's not working on the simulator either. Can somebody tell me what's the problem?
-(UIImage *)generateThumbImage : (NSString *)filepath
{
NSURL *url = [NSURL fileURLWithPath:filepath];
AVAsset *asset = [AVAsset assetWithURL:url];
AVAssetImageGenerator *imageGenerator = [[AVAssetImageGenerator alloc]initWithAsset:asset];
CMTime time = [asset duration];
time.value = 0;
CGImageRef imageRef = [imageGenerator copyCGImageAtTime:time actualTime:NULL error:NULL];
UIImage *thumbnail = [UIImage imageWithCGImage:imageRef];
CGImageRelease(imageRef); // CGImageRef won't be released by ARC
return thumbnail;
}

Answer 1

This code will generating an image from a particular time in the loaded video and convert the image from a CGImage to UIImage.
The code is commented to explain its parts.
- (UIImage*)loadImage {
AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:vidURL options:nil];
AVAssetImageGenerator *generate = [[AVAssetImageGenerator alloc] initWithAsset:asset]; // Create object of Video.
NSError *err = NULL;
CMTime time = CMTimeMake(1, 60); // Select time of 1/60ths of a second.
CGImageRef imgRef = [generate copyCGImageAtTime:time actualTime:NULL error:&err]; // Get Image on that time frame.
NSLog(#"err==%#, imageRef==%#", err, imgRef); // if something is not as expected then u can log error.
return [[UIImage alloc] initWithCGImage:imgRef]; // Convert Image from CGImage to UIImage so you can display it easily in a image view.
}

Answer 2

Have you tried AVFoundation framework?
That's what it's for. The documentation is on the Apple site:
AV Foundation framework provides essential services for working with
time-based audiovisual media on iOS and OS X. Through a modern
Objective-C interface, you can easily play, capture, edit, or encode
media formats such as QuickTime movies and MPEG-4 files.