ios根据视频地址获取某一帧的图像
浏览数：30 /
时间：2015年06月11日
//CatchImage.h
#import <Foundation/Foundation.h>
@interface CatchImage : NSObject
/*
*videoURL:视频地址(本地/网络)
*time :第N帧
*/
+ (UIImage*) thumbnailImageForVideo:(NSURL *)videoURL atTime:(NSTimeInterval)time;
@end
//CatchImage.m
#import "CatchImage.h"
#import <AVFoundation/AVFoundation.h>
#import <AVFoundation/AVAssetImageGenerator.h>
#import <AVFoundation/AVAsset.h>
@implementation CatchImage
+ (UIImage*) thumbnailImageForVideo:(NSURL *)videoURL atTime:(NSTimeInterval)time {
AVURLAsset *asset = [[[AVURLAsset alloc] initWithURL:videoURL options:nil]autorelease];
NSParameterAssert(asset);
AVAssetImageGenerator *assetImageGenerator =[[[AVAssetImageGenerator alloc] initWithAsset:asset]autorelease];
assetImageGenerator.appliesPreferredTrackTransform = YES;
assetImageGenerator.apertureMode =AVAssetImageGeneratorApertureModeEncodedPixels;
CGImageRef thumbnailImageRef = NULL;
CFTimeInterval thumbnailImageTime = time;
NSError *thumbnailImageGenerationError = nil;
thumbnailImageRef = [assetImageGenerator copyCGImageAtTime:CMTimeMake(thumbnailImageTime, 60)actualTime:NULL error:&thumbnailImageGenerationError];
if(!thumbnailImageRef)
NSLog(@"thumbnailImageGenerationError %@",thumbnailImageGenerationError);
UIImage*thumbnailImage = thumbnailImageRef ? [[[UIImage alloc]initWithCGImage:thumbnailImageRef] autorelease] : nil;
return thumbnailImage;
}
@end
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