iOS 视频的每一帧图片关键帧

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#import <AVFoundation/AVAsset.h>

#import <AVFoundation/AVAssetImageGenerator.h>

#import <AVFoundation/AVTime.h>

//方法一

- (void)movieToImage{

NSURL *url = [NSURL URLWithString:movieURL];

AVURLAsset *asset=[[AVURLAsset alloc] initWithURL:url options:nil];

AVAssetImageGenerator *generator = [[AVAssetImageGeneratoralloc]initWithAsset:asset];

generator.appliesPreferredTrackTransform=TRUE;

[asset release];

CMTime thumbTime =CMTimeMakeWithSeconds(0,30);

AVAssetImageGeneratorCompletionHandler handler =

^(CMTime requestedTime,CGImageRef im,CMTime actualTime,AVAssetImageGeneratorResult result,NSError *error){

if (result !=AVAssetImageGeneratorSucceeded) { }//没成功

UIImage *thumbImg = [[UIImageimageWithCGImage:im]retain];

[generator release];

[selfperformSelectorOnMainThread:@selector(movieImage:)withObject:thumbImgwaitUntilDone:YES];

};

generator.maximumSize =self.frame.size;

[generator generateCGImagesAsynchronouslyForTimes:

[NSArrayarrayWithObject:[NSValuevalueWithCMTime:thumbTime]]completionHandler:handler];

}

//方法二

//MPMoviePlayerController 类已经提供了得到帧图片和方法

- (UIImage *)thumbnailImageAtTime:(NSTimeInterval)playbackTime timeOption:(MPMovieTimeOption)optionNS_DEPRECATED_IOS(3_2,7_0);

//使用：

[movieImage setImage:[tempMovie thumbnailImageAtTime:2.5f timeOption:MPMovieTimeOptionNearestKeyFrame]];

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