AVAsset/AVCaptureSession으로 비디오 자르기

Question

비디오를 사각형으로 자르려고합니다. 사각형 해상도 .mov 파일을 생성하는 AVCaptureSession 설정이 이미 있습니다. 그래서 나는 단지 내가 발견 한 코드로 그것을 자르려고 시도하고 있습니다. here.

-(void)cropVideo:(NSURL*)videoURL{ 


// input file 
AVAsset* asset = [AVAsset assetWithURL:videoURL]; 

AVMutableComposition *composition = [AVMutableComposition composition]; 
[composition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid]; 

// input clip 
AVAssetTrack *clipVideoTrack = [[asset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0]; 

// make it square 
AVMutableVideoComposition* videoComposition = [AVMutableVideoComposition videoComposition]; 
videoComposition.renderSize = CGSizeMake(clipVideoTrack.naturalSize.height, clipVideoTrack.naturalSize.height); 
videoComposition.frameDuration = CMTimeMake(1, 30); 

AVMutableVideoCompositionInstruction *instruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction]; 
instruction.timeRange = CMTimeRangeMake(kCMTimeZero, CMTimeMakeWithSeconds(60, 30)); 

// rotate to portrait 
AVMutableVideoCompositionLayerInstruction* transformer = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:clipVideoTrack]; 
CGAffineTransform t1 = CGAffineTransformMakeTranslation(clipVideoTrack.naturalSize.height, -(clipVideoTrack.naturalSize.width - clipVideoTrack.naturalSize.height) /2); 
CGAffineTransform t2 = CGAffineTransformRotate(t1, M_PI_2); 

CGAffineTransform finalTransform = t2; 
[transformer setTransform:finalTransform atTime:kCMTimeZero]; 
instruction.layerInstructions = [NSArray arrayWithObject:transformer]; 
videoComposition.instructions = [NSArray arrayWithObject: instruction]; 

// export 
exporter = [[AVAssetExportSession alloc] initWithAsset:asset presetName:AVAssetExportPresetHighestQuality] ; 
exporter.videoComposition = videoComposition; 

NSURL *tmpDirURL = [NSURL fileURLWithPath:NSTemporaryDirectory() isDirectory:YES]; 
NSURL *fileURL = [[tmpDirURL URLByAppendingPathComponent:@"final"] URLByAppendingPathExtension:@"mov"]; 

exporter.outputURL=fileURL; 
exporter.outputFileType=AVFileTypeQuickTimeMovie; 

[exporter exportAsynchronouslyWithCompletionHandler:^(void){ 
    NSLog(@"Exporting done!"); 
    NSLog(@"exporter's outputURL is %@", exporter.outputURL); 
    self.moviePlayer = [[MPMoviePlayerController alloc] initWithContentURL:fileURL]; 
    [self.view addSubview:self.moviePlayer.view]; 
    self.moviePlayer.fullscreen = YES; 
    [self.moviePlayer play]; 

}];} 

그러나, 수출을 실행 한 후, 영화가 self.moviePlayer에서 재생되지 않습니다 여기 내 코드입니다. 그냥 "로드 중 .."갑니다. 원래 videoURL 매개 변수를 사용하여 moviePlayer을 테스트했는데 문제가 없습니다. 내가 뭘 잘못하고 있는지에 대한 아이디어가 있습니까?

감사

Answer 1

필요 : 완료 핸들러

dispatch_async(dispatch_get_main_queue(), ^{ 
    //play movie here 
}); 

.