How to get thumbnail image of video from ALAsset in iOS? - ios

Question

I want to get thumbnail images of every frame from video and then save this images in Mutable Array of images.
I want to use this images to play as a animation.
NSURL* assetURL = [self.asset valueForProperty:ALAssetPropertyAssetURL];
NSDictionary* assetOptions = nil;
AVAsset* myAsset = [[AVURLAsset alloc] initWithURL:assetURL options:assetOptions];
self.imageGenerator = [AVAssetImageGenerator assetImageGeneratorWithAsset:myAsset];
int duration = CMTimeGetSeconds([myAsset duration]);
for(int i = 0; i<duration; i++)
{
CGImageRef imgRef = [self.imageGenerator copyCGImageAtTime:CMTimeMake(i, duration) actualTime:NULL error:nil];
UIImage* thumbnail = [[UIImage alloc] initWithCGImage:imgRef scale:UIViewContentModeScaleAspectFit orientation:UIImageOrientationUp];
[thumbnailImages addObject:thumbnail];
}
I am using above code to get thumbnail images but the problem is if there is a 2 seconds video i am only getting 2 thumbnails but i want 20 thumbnails (10 thumbnail per second).
So, how to use CMTimeMake to get thumbnails for every .1 second

Answer 1

Code form reference site : Thumbnail image from Video
Objective - C
-(UIImage *)generateThumbImage : (NSString *)filepath
{
NSURL *url = [NSURL fileURLWithPath:filepath];
AVAsset *asset = [AVAsset assetWithURL:url];
AVAssetImageGenerator *imageGenerator = [[AVAssetImageGenerator alloc]initWithAsset:asset];
self.imageGenerator.appliesPreferredTrackTransform = YES;
CMTime time = [asset duration];
time.value = 0;
Float duration = CMTimeGetSeconds([myAsset duration]);
for(Float i = 0.0; i<duration; i=i+0.1)
{
CGImageRef imgRef = [self.imageGenerator copyCGImageAtTime:CMTimeMake(i, duration) actualTime:NULL error:nil];
UIImage* thumbnail = [[UIImage alloc] initWithCGImage:imgRef scale:UIViewContentModeScaleAspectFit orientation:UIImageOrientationUp];
[thumbnailImages addObject:thumbnail];
}
}
Swift
func generateThumbImage(url : NSURL) -> UIImage{
var asset : AVAsset = AVAsset.assetWithURL(url) as! AVAsset
var assetImgGenerate : AVAssetImageGenerator = AVAssetImageGenerator(asset: asset)
assetImgGenerate.appliesPreferredTrackTransform = true
var error : NSError? = nil
var time : CMTime = CMTimeMake(1, 30)
var img : CGImageRef = assetImgGenerate.copyCGImageAtTime(time, actualTime: nil, error: &error)
var frameImg : UIImage = UIImage(CGImage: img)!
return frameImg
}

Answer 2

#Kirit Modi solution in Swift 3 with some small changes:
func generateThumbImage(url : URL) -> UIImage?{
let asset = AVAsset(url: url)
let assetImgGenerate : AVAssetImageGenerator = AVAssetImageGenerator(asset: asset)
assetImgGenerate.appliesPreferredTrackTransform = true
let time = CMTimeMake(1, 30)
let img = try? assetImgGenerate.copyCGImage(at: time, actualTime: nil)
guard let cgImage = img else { return nil }
let frameImg = UIImage(cgImage: cgImage)
return frameImg
}

Answer 3

Following code for the getting the thumb image from video at 0.41
NSString *str = [[self.videoArray objectAtIndex:i] valueForKey:#"vName"];
NSURL *videoURL = [NSURL URLWithString:str] ;
MPMoviePlayerController *player = [[[MPMoviePlayerController alloc] initWithContentURL:videoURL]autorelease];
UIImage *thumbnail = [player thumbnailImageAtTime:0.41 timeOption:MPMovieTimeOptionNearestKeyFrame];
player = nil;

Answer 4

extension UIImageView{
func getImageThumnail(forLink link: String) {
let asset = AVAsset(url: URL(string: link)!)
let assetImgGenerate = AVAssetImageGenerator(asset: asset)
assetImgGenerate.appliesPreferredTrackTransform = true
let time = CMTimeMakeWithSeconds(Float64(50), 100)
DispatchQueue.global(qos: .userInteractive).async {
do {
let img = try assetImgGenerate.copyCGImage(at: time, actualTime: nil)
let thumbnail = UIImage(cgImage: img)
DispatchQueue.main.async {
self.image = thumbnail
}
} catch {
}
}
}
}