AVVideoCompositionCoreAnimationTool 및 세로 모드의 CALayer?

Question

iOS 4.3에서 AVMutableComposition, AVMutableVideoComposition 및 AVVideoCompositionCoreAnimationTool을 사용하여 CALayer를 세로 모드 비디오 (내보내기시)로 베이크하려고합니다. 이 모든 것이 가로로 작동합니다. 그러나 비디오를 세로로 캡처하면 AVVideoCompositionCoreAnimationTool이 비디오 트랙의 변환을 무시합니다. 즉, 세로 모드 비디오의 경우 AVMutableCompositionTrack.preferredTransform을 원래 에셋 비디오 트랙의 preferredTransform 값으로 설정합니다. AVVideoCompositionCoreAnimationTool을 사용하지 않는 한이 방법이 작동하며 비디오가 세로 모드로 나옵니다. 그러나 AVVideoCompositionCoreAnimationTool과 CALayer를 추가하자마자 파일이 가로로 나옵니다. (CALayer는 올바르게 표시되지만 뒤에있는 비디오는 측면에 있으며 파일의 가로 세로 비율은 꺼져 있습니다.) CALayer에 변환을 적용하고 ACVideoComposition에 변형을 설정해 보았습니다. 이들 중 어느 것도 제작 된 파일의 방향을 변경하지 않습니다 (여전히 360x480이 아닌 480x369입니다). AVVideoCompositionCoreAnimationTool을 사용하여 세로 모드 비디오를 렌더링하는 방법이 있습니까?

먼저 나는

CALayer *animationLayer = [CALayer layer]; 
animationLayer.bounds = CGRectMake(0, 0, videoSize.width, videoSize.height); 

CATextLayer *titleLayer = [CATextLayer layer]; 
titleLayer.string = [effect valueForKey:@"title"]; 
titleLayer.font = [effect valueForKey:@"font"]; 
titleLayer.fontSize = 30; 

titleLayer.alignmentMode = kCAAlignmentCenter; 
titleLayer.bounds = CGRectMake(0, 0, videoSize.width, videoSize.height/6); 

[animationLayer addSublayer:titleLayer]; 
titleLayer.anchorPoint = CGPointMake(0.5, 0.5); 
titleLayer.position = CGPointMake(CGRectGetMidX(layer.bounds), CGRectGetMidY(layer.bounds));  

CABasicAnimation *fadeAnimation = [CABasicAnimation animationWithKeyPath:@"opacity"]; 
fadeAnimation.fromValue = [NSNumber numberWithFloat:1.0]; 
fadeAnimation.toValue = [NSNumber numberWithFloat:0.0]; 
fadeAnimation.additive = NO; 
fadeAnimation.removedOnCompletion = NO; 
fadeAnimation.beginTime = 3.5; 
fadeAnimation.duration = 1.0; 
fadeAnimation.fillMode = kCAFillModeBoth; 
[titleLayer addAnimation:fadeAnimation forKey:nil]; 

마지막으로 나는 AVMutableVideoComposition

CALayer *parentLayer = [CALayer layer]; 
CALayer *videoLayer = [CALayer layer]; 

parentLayer.bounds = CGRectMake(0, 0, videoSize.width, videoSize.height); 
parentLayer.anchorPoint = CGPointMake(0, 0); 
parentLayer.position = CGPointMake(0, 0); 

videoLayer.bounds = CGRectMake(0, 0, videoSize.width, videoSize.height); 
[parentLayer addSublayer:videoLayer]; 
videoLayer.anchorPoint = CGPointMake(0.5, 0.5); 
videoLayer.position = CGPointMake(CGRectGetMidX(parentLayer.bounds), CGRectGetMidY(parentLayer.bounds)); 
[parentLayer addSublayer:layer];  
animationLayer.anchorPoint = CGPointMake(0.5, 0.5); 
animationLayer.position = CGPointMake(CGRectGetMidX(parentLayer.bounds), CGRectGetMidY(parentLayer.bounds)); 
videoComposition.animationTool = [AVVideoCompositionCoreAnimationTool videoCompositionCoreAnimationToolWithPostProcessingAsVideoLayer:videoLayer inLayer:parentLayer]; 

그리고 수출에의 CALayer 추가 제목으로 AVMutableComposition 및 AVMutableVideoComposition

AVMutableComposition *composition = [AVMutableComposition composition]; 
AVMutableCompositionTrack *compositionVideoTrack = [composition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid]; 
AVURLAsset *videoAsset = [AVURLAsset URLAssetWithURL:url options:nil]; 
CMTimeRange timeRange = CMTimeRangeMake(kCMTimeZero, [videoAsset duration]); 
AVAssetTrack *clipVideoTrack = [[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0]; 

CGSize videoSize = CGSizeApplyAffineTransform(clipVideoTrack.naturalSize, clipVideoTrack.preferredTransform); 
videoSize.width = fabs(videoSize.width); 
videoSize.height = fabs(videoSize.height); 

CMTime titleDuration = CMTimeMakeWithSeconds(5, 600); 
CMTimeRange titleRange = CMTimeRangeMake(kCMTimeZero, titleDuration); 

[compositionVideoTrack insertTimeRange:titleRange ofTrack:nil atTime:kCMTimeZero error:nil]; 
[compositionVideoTrack insertTimeRange:timeRange ofTrack:clipVideoTrack atTime:titleDuration error:nil]; 
compositionVideoTrack.preferredTransform = clipVideoTrack.preferredTransform; 

AVMutableVideoComposition *videoComposition = [AVMutableVideoComposition videoComposition]; 
AVMutableVideoCompositionInstruction *passThroughInstruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction]; 
passThroughInstruction.timeRange = CMTimeRangeMake(kCMTimeZero, [composition duration]); 
AVAssetTrack *videoTrack = [[composition tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0]; 
AVMutableVideoCompositionLayerInstruction *passThroughLayer = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:videoTrack];  
passThroughInstruction.layerInstructions = [NSArray arrayWithObject:passThroughLayer]; 
videoComposition.instructions = [NSArray arrayWithObject:passThroughInstruction];  
videoComposition.frameDuration = CMTimeMake(1, 30); 
videoComposition.renderSize = videoSize; 
videoComposition.renderScale = 1.0; 

그리고있는 CALayer를 설정!

AVAssetExportSession *exportSession = [[[AVAssetExportSession alloc] initWithAsset:composition presetName:AVAssetExportPresetMediumQuality] autorelease]; 
exportSession.videoComposition = videoComposition; 

NSURL *segmentFileURL = //some local URL 
exportSession.outputFileType = @"com.apple.quicktime-movie"; 
exportSession.outputURL = segmentFileURL; 


[exportSession exportAsynchronouslyWithCompletionHandler:^{ 
    switch ([exportSession status]) { 
     case AVAssetExportSessionStatusFailed: 
      Log(@"Export failed: %@", [exportSession error]); 
      break; 
     case AVAssetExportSessionStatusCancelled: 
      Log(@"Export canceled"); 
      break; 
     case AVAssetExportSessionStatusCompleted: 
      Log(@"Export done"); 
      break; 
    } 
}]; 

이 코드는 가로 모드에서 작동하고, 또한 세로 I 라인 videoComposition.animationTool = [AVVideoCompositionCoreAnimationTool videoCompositionCoreAnimationToolWithPostProcessingAsVideoLayer:videoLayer inLayer:parentLayer];

Answer 1

이 시도하고뿐만 아니라 다른 지침을 추가를 제거합니다.

///turn video 90 degrees 
AVMutableVideoCompositionLayerInstruction *passThroughLayer = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:clipVideoTrack]; 
CGAffineTransform rotationTransform = CGAffineTransformMakeRotation(degreesToRadians(90.0)); 
CGAffineTransform rotateTranslate = CGAffineTransformTranslate(rotationTransform,320,0); 
[passThroughLayer setTransform:rotateTranslate atTime:kCMTimeZero]; 

어떻게 진행되는지 알려주세요.

MacMike