ios – AVVideoCompositionCoreAnimationTool和CALayer在纵向模式？

概述我正在尝试在iOS 4.3上使用AVMutableComposition,AVMutableVideoComposition和AVVideoCompositionCoreAnimationTool,将CALayer制作成纵向模式视频(导出).这一切都在景观中起作用.然而,如果我以纵向拍摄视频,则AVVideoCompositionCoreAnimationTool忽略了视频轨道上的变换.也就是说, 我正在尝试在iOS 4.3上使用AVMutableComposition,AVMutableVIDeoComposition和AVVIDeoCompositionCoreAnimationTool,将CALayer制作成纵向模式视频(导出).这一切都在景观中起作用.然而,如果我以纵向拍摄视频,则AVVIDeoCompositionCoreAnimationTool忽略了视频轨道上的变换.也就是说,对于纵向模式视频,我将AVMutableCompositionTrack.preferredtransform设置为原始资源视频轨道的preferredtransform值.只要我不使用AVVIDeoCompositionCoreAnimationTool,这是有效的,视频以纵向模式出现.然而,一旦添加了AVVIDeoCompositionCoreAnimationTool和CALayer,文件就会出现. (CALayer正确显示,但其后面的视频在其侧面,文件的宽高比关闭).我已经尝试将变换应用于CALayer,并在ACVIDeoComposition中设置变换.这两个都不会改变文件的方向(它仍然是480×369,而不是360×480).有没有办法使用AVVIDeoCompositionCoreAnimationTool渲染纵向模式视频？

首先我设置一个AVMutableComposition和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;

和一个标题的CALayer

CALayer *animationLayer = [CALayer layer];animationLayer.bounds = CGRectMake(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,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];

最后,我将CALayer添加到AVMutableVIDeoComposition

CALayer *parentLayer = [CALayer layer];CALayer *vIDeolayer = [CALayer layer];parentLayer.bounds = CGRectMake(0,vIDeoSize.height);parentLayer.anchorPoint =  CGPointMake(0,0);parentLayer.position = CGPointMake(0,0);vIDeolayer.bounds = CGRectMake(0,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];

并出口！

AVAssetExportSession *exportSession = [[[AVAssetExportSession alloc] initWithAsset:composition presetname:AVAssetExportPresetMediumQuality] autorelease];exportSession.vIDeoComposition = vIDeoComposition; NSURL *segmentfileURL = //some local URLexportSession.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;    }}];

此代码在横向模式下工作,并且如果我删除行,也以纵向方式.Composition.animationTool = [AVVIDeoCompositionCoreAnimationTool vIDeoCompositionCoreAnimationToolWithPostProcessingAsVIDeolayer：vIDeolayer inLayer：parentLayer];

解决方法 尝试这样做,并添加您的其他说明.

///turn vIDeo 90 degreesAVMutableVIDeoCompositionLayerInstruction *passthroughLayer = [AVMutableVIDeoCompositionLayerInstruction vIDeoCompositionLayerInstructionWithAssetTrack:clipVIDeoTrack];CGAffinetransform rotationtransform = CGAffinetransformMakeRotation(degreesToradians(90.0));CGAffinetransform rotateTranslate = CGAffinetransformTranslate(rotationtransform,320,0);[passthroughLayer settransform:rotateTranslate atTime:kCMTimeZero];

让我知道如何去！

MacMike

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