AVMutableComposition - 导出错误的视频转换 [英] AVMutableComposition - Exporting wrong video transform
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问题描述
导出 VideoAsset 后:
After exporting VideoAsset:
问题:
- 视频方向不是原始变换
- 导出的视频层似乎总是横向.
尝试:
- 转换视频层方向 - 旋转到原始方向
- 视频层大小 - 使其成为全屏大小(按原始方向)
- transform video layer orientation - rotate to original orientation
- video layer size - make it full screen size (by original orientation)
一些注意事项:
- videoAsset 的 CGRect 从一开始就相反.
导出后,视频变换错误
after export, video transform is wrong
尝试旋转全尺寸图层没有成功
tried to rotate with no success for full size layer
AVURLAsset*videoAsset = [[AVURLAsset alloc]initWithURL:url options:nil];
AVMutableComposition* mixComposition = [AVMixerBase compositionVideoTrackAssetUrl:videoAsset];
AVMutableVideoComposition *videoComposition=[AVMutableVideoComposition videoComposition];
videoComposition.frameDuration=CMTimeMake(1, 30); //frames per seconds
videoComposition.renderSize = videoAsset.naturalSize;
//videoComposition.renderScale = 1.0;
videoComposition.animationTool = [AVVideoCompositionCoreAnimationTool videoCompositionCoreAnimationToolWithPostProcessingAsVideoLayer:videoLayer inLayer:parentLayer];
AVMutableCompositionTrack *videoTrack = [[mixComposition tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0]; //was AVAssetTrack *videoTrack
AVMutableVideoCompositionLayerInstruction *layerInstruction = [self layerInstructionAfterFixingOrientationForAsset:videoAsset
forTrack:videoTrack atTime:videoAsset.duration];
AVMutableVideoCompositionLayerInstruction *layerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:videoTrack];
[layerInstruction setTransform:videoTrack.preferredTransform atTime:kCMTimeZero];
[layerInstruction setOpacity:0.0 atTime:videoAsset.duration];
AVMutableVideoCompositionInstruction *instruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction];
instruction.timeRange = CMTimeRangeMake(kCMTimeZero, [videoAsset duration]);
instruction.layerInstructions = [NSArray arrayWithObject:layerInstruction];
videoComposition.instructions = [NSArray arrayWithObject:instruction];
设置轨道
+(AVMutableComposition *)compositionVideoTrackAssetUrl:(AVURLAsset*)assetUrl{
AVMutableComposition* mixComposition = [AVMutableComposition composition];
AVMutableCompositionTrack *compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
AVMutableCompositionTrack *compositionAudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
AVAssetTrack *clipVideoTrack = [[assetUrl tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
AVAssetTrack *clipAudioTrack = [[assetUrl tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];
[compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, assetUrl.duration) ofTrack:clipVideoTrack atTime:kCMTimeZero error:nil];
[compositionAudioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, assetUrl.duration) ofTrack:clipAudioTrack atTime:kCMTimeZero error:nil];
[compositionVideoTrack setPreferredTransform:[[[assetUrl tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] preferredTransform]];
return mixComposition;
}
so after researching all stack overflow discussions about export rotation,
I'm still having video rotation to size issue...
推荐答案
好的,我的回答代码没有组织,但可以解决问题:
OK, my answer code is not organized, but that will do the work:
注意:当您使用导出会话"时,将渲染大小设置为以下代码:-
NOTE: when you using "export Session", set render size as the code below :-
"[AVMixerBase shared].renderSize"
AVURLAsset*videoAsset = [[AVURLAsset alloc]initWithURL:url options:nil];
AVAssetTrack*videoAssetTrack = [[videoAsset tracksWithMediaType:AVMediaTypeVideo] firstObject];
[[AVMixerBase shared]setVideoAsset:videoAsset];
AVMutableComposition *mixComposition = [AVMixerBase compositionVideoTrackAssetUrl:videoAsset]; /* audio + video */
AVMutableCompositionTrack *compositionVideoTrack = [[mixComposition tracksWithMediaType:AVMediaTypeVideo] firstObject];
AVMutableVideoComposition *videoComposition = [AVMutableVideoComposition videoComposition];
AVMutableVideoCompositionLayerInstruction *layerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:compositionVideoTrack];
CALayer *videoLayer = [self videoLayerAssetUrl:videoAsset];
CALayer *parentLayer = [CALayer layer];
CGSize videoSize = [videoAssetTrack naturalSize];
_segments = file.prefferedTranslation.customSegments;
NSLog(@"_segments %@",_segments);
//set render sizes:
//3.0_______COMBINE ALL
UIImageOrientation orientation = [self videoOrientation:videoAsset];
switch (orientation) {
case UIImageOrientationUp:{ NSLog(@"Up"); //camera - lansdscape right
[AVMixerBase shared].renderSize = CGSizeMake(videoSize.width, videoSize.height);
break;
}
case UIImageOrientationDown:{ NSLog(@"Down"); //camera = lansdscape left
[AVMixerBase shared].renderSize = CGSizeMake(videoSize.width, videoSize.height);
videoLayer.affineTransform = CGAffineTransformMakeRotation(M_PI);
break;
}
case UIImageOrientationLeft:{ NSLog(@"Left");
break;
}
case UIImageOrientationRight:{ NSLog(@"Right");
//camera = up
CGAffineTransform t1 = CGAffineTransformMakeTranslation(videoSize.height, 0);
CGAffineTransform t2 = CGAffineTransformRotate(t1, DEGREES_TO_RADIANS(90.0));
[layerInstruction setTransform:t2 atTime:kCMTimeZero];
[AVMixerBase shared].renderSize = CGSizeMake(videoSize.height, videoSize.width);
break;
}
default:
break;
}
+(AVMutableComposition *)compositionVideoTrackAssetUrl:(AVURLAsset*)assetUrl{
AVMutableComposition* mixComposition = [AVMutableComposition composition];
mixComposition = [AVMixerBase addVideoTrackAssetUrl:assetUrl mixComposition:mixComposition];
return mixComposition;
}
+(AVMutableComposition *)addVideoTrackAssetUrl:(AVURLAsset*)assetUrl mixComposition:(AVMutableComposition*)mixComposition{
AVMutableCompositionTrack *compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
AVMutableCompositionTrack *compositionAudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
AVAssetTrack *clipVideoTrack = [[assetUrl tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
AVAssetTrack *clipAudioTrack = [[assetUrl tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0];
[compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, assetUrl.duration) ofTrack:clipVideoTrack atTime:kCMTimeZero error:nil];
[compositionAudioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, assetUrl.duration) ofTrack:clipAudioTrack atTime:kCMTimeZero error:nil];
[compositionVideoTrack setPreferredTransform:[[[assetUrl tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] preferredTransform]];
return mixComposition;
}
-(CALayer*)videoLayerAssetUrl:(AVURLAsset*)assetUrl{
CGSize sizeOfVideo = [[[assetUrl tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] naturalSize];
CALayer *videoLayer = [CALayer layer];
videoLayer.frame = CGRectMake(0, 0, sizeOfVideo.width, sizeOfVideo.height);
// videoLayer.frame = CGRectMake(0, 0, sizeOfVideo.height, sizeOfVideo.width);
// [videoLayer setAffineTransform:assetUrl.preferredTransform];
return videoLayer;
}
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