iOS将视频录像切成一张张缩略图

/** * 获取网络视频的全部缩略图方法 * * @param videoURL 视频的链接地址 * * @return 视频截图 */+ (UIImage *)ihefe_previewImageWithVideoURL:(NSURL *)videoURL{ AVAsset *asset = [AVAsset assetWithURL:videoURL]; AVAssetImageGenerator *generator = [AVAssetImageGenerator assetImageGeneratorWithAsset:asset]; generator.appliesPreferredTrackTransform = YES; CGImageRef img = [generator copyCGImageAtTime:CMTimeMake(1, asset.duration.timescale) actualTime:NULL error:nil]; UIImage *image = [UIImage imageWithCGImage:img]; CGImageRelease(img); return image;}/** * 获取本地视频的全部缩略图方法 * * @param fileurl 视频的链接地址 * * @return 视频截图 */+ (UIImage *)ihefe_getScreenShotImageFromVideoURL:(NSString *)fileurl{ UIImage *shotImage; //视频路径URL NSURL *fileURL = [NSURL URLWithString:fileurl]; AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:fileURL options:nil]; AVAssetImageGenerator *gen = [[AVAssetImageGenerator alloc] initWithAsset:asset]; gen.appliesPreferredTrackTransform = YES; CMTime time = CMTimeMakeWithSeconds(0.0, 600); NSError *error = nil; CMTime actualTime; CGImageRef image = [gen copyCGImageAtTime:time actualTime:&actualTime error:&error]; shotImage = [[UIImage alloc] initWithCGImage:image]; CGImageRelease(image); return shotImage;}/** * 获取视频的某一帧缩略图方法 * * @param videoURL 视频的链接地址 帧时间 * @param time  帧时间 * * @return 视频截图 */+ (UIImage*)ihefe_thumbnailImageForVideo:(NSURL *)videoURL atTime:(NSTimeInterval)time{ AVURLAsset *asset = [[AVURLAsset alloc] initWithURL:videoURL options:nil]; NSParameterAssert(asset); AVAssetImageGenerator *assetImageGenerator = [[AVAssetImageGenerator alloc] initWithAsset:asset]; 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] : nil; return thumbnailImage;}