视频帧截取

#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIImageView *imageView;

@property(nonatomic ,strong)AVAssetImageGenerator * generatorl;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{

    //获取资源路径
    NSURL * url  = [[NSBundle mainBundle]URLForResource:@"Alizee_La_Isla_Bonita副本.mp4" withExtension:nil];

    //包装

    AVAsset * set = [AVAsset assetWithURL:url];

    //创建视频截取器

    AVAssetImageGenerator * generator = [AVAssetImageGenerator assetImageGeneratorWithAsset:set];

    self.generatorl = generator;

    CMTime  time = CMTimeMake(10, 1);
    //
    NSValue * value = [NSValue valueWithCMTime:time];

    //截取视频 ( 这个方法截取的不准确)
    [generator generateCGImagesAsynchronouslyForTimes:@[value] completionHandler:^(CMTime requestedTime, CGImageRef  _Nullable image, CMTime actualTime, AVAssetImageGeneratorResult result, NSError * _Nullable error) {

        UIImage * images = [UIImage imageWithCGImage:image];

        dispatch_sync(dispatch_get_main_queue(), ^{

            self.imageView.image = images;

        });

    }];

}