视频取帧

///视频取帧

- (UIImage*) 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;

//取帧

CGImageRef thumbTemp = NULL;

CMTime actualTime ;

//    int32_t time = asset.duration.timescale;

NSError *error = nil;

thumbTemp = [assetImageGenerator copyCGImageAtTime:CMTimeMake(time, asset.duration.timescale) actualTime:&actualTime error:&error];

NSLog(@"%lld",actualTime.value);

UIImage *thumb = nil;

if (!error)

{

thumb = [[UIImage alloc] initWithCGImage:thumbTemp];

}

CGImageRelease(thumbTemp);

return thumb;

}