iOS获取视频中的指定帧的两种方法

方法一 ：AVFoundation

 1 #import <AVFoundation/AVFoundation.h>
 2
 3 - (UIImage *)thumbnailImageForVideo:(NSURL *)videoURL atTime:(NSTimeInterval)time {
 4     AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:videoURL options:nil];
 5     NSParameterAssert(asset);
 6     AVAssetImageGenerator *assetImageGenerator =[[AVAssetImageGenerator alloc] initWithAsset:asset];
 7     assetImageGenerator.appliesPreferredTrackTransform = YES;
 8     assetImageGenerator.apertureMode =AVAssetImageGeneratorApertureModeEncodedPixels;
 9
10     CGImageRef thumbnailImageRef = NULL;
11     CFTimeInterval thumbnailImageTime = time;
12     NSError *thumbnailImageGenerationError = nil;
13     thumbnailImageRef = [assetImageGenerator copyCGImageAtTime:CMTimeMake(thumbnailImageTime, 60)actualTime:NULL error:&thumbnailImageGenerationError];
14
15     if(!thumbnailImageRef)
16         CXIMLog(@"thumbnailImageGenerationError %@",thumbnailImageGenerationError);
17
18     UIImage *thumbnailImage = thumbnailImageRef ? [[UIImage alloc]initWithCGImage:thumbnailImageRef] : nil;
19     return thumbnailImage;
20 }

方法二：MPMoviePlayerController

1 #import <MediaPlayer/MediaPlayer.h>
2
3 MPMoviePlayerController *moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:videoURL];
4 moviePlayer.shouldAutoplay = NO;
5 UIImage *thumbnailImage = [moviePlayer thumbnailImageAtTime:time timeOption:MPMovieTimeOptionNearestKeyFrame];