扩展-使用AVFoundation生成缩略图

//

//  ViewController.m

//  扩展-使用AVFoundation生成缩略图

//

//  Created by dc008 on 15/12/29.

//  Copyright © 2015年 lin. All rights reserved.

//

#import "ViewController.h"

#import <AVFoundation/AVFoundation.h>

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    [self imageRequest:50.0];

}

- (void)imageRequest : (CGFloat)timeBySecond{

    //建立url

    

    NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle]pathForResource:@"0" ofType:@"mp4"]];

    //根据url建立AVURLAsset

    AVURLAsset *urlAsset = [AVURLAsset assetWithURL:url];

    //根据AVURLAsset建立 AVAssetImageGenerator(图片生成对象)

    AVAssetImageGenerator *imageGenerator = [AVAssetImageGenerator assetImageGeneratorWithAsset:urlAsset];

    //建立截取的时间点(参数：视频第几秒，每秒帧数)

    CMTime time = CMTimeMakeWithSeconds(timeBySecond, 10);

    //接收实际截取图片时间

    CMTime actualTime;

    CGImageRef cgImage = [imageGenerator copyCGImageAtTime:time actualTime:&actualTime error:nil];

    //显示实际时间

    CMTimeShow(actualTime);

    //将CGImageRef -> UIImage

    UIImage *image = [UIImage imageWithCGImage:cgImage];

    

    UIImageView *imageView = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 375, 375)];

    imageView.contentMode = UIViewContentModeScaleAspectFit;

    imageView.image = image;

    [self.view addSubview:imageView];

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

@end