我实际上正在使用AVFoundation框架。 我正在尝试同时播放两个视频，一个带有过滤器，另一个正常。
我已经完成了整个任务。我只是想在将整个视频保存在图库中时最后设置方向。 我已经尝试了很多，但没有任何成果。 请帮助我设置方向。
//Save action
@IBAction func saveAction(_ sender: UIButton) {
HelperClass.shared().applyFilter(self.firstAsset, andSecondAsset:self.secondAsset, onviewController:self, andcompos:self.composition, completion: { (value,error,url) in
if(url != nil){
print("url",url!)
}
})
MBProgressHUD.showAdded(to:self.view, animated: true)
}
#pragma mark - Overlay task is happening here,filtered video that I am getting from applyfilter method is overlayed with foregroundvideo
-(void)saveVideosToPhotoAlbum:(AVURLAsset*)filteredasset andOriginalAsset:(AVURLAsset*)origAsset onViewController:(UIViewController*)vc{
AVMutableComposition* mixComposition = [[AVMutableComposition alloc] init];
//----first track---//
AVMutableCompositionTrack *firstTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
[firstTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, origAsset.duration) ofTrack:[[origAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:kCMTimeZero error:nil];
//----second track---//
AVMutableCompositionTrack *secondTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
[secondTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, filteredasset.duration) ofTrack:[[filteredasset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:kCMTimeZero error:nil];
AVMutableVideoCompositionInstruction * MainInstruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction];
MainInstruction.timeRange = CMTimeRangeMake(kCMTimeZero, origAsset.duration);
//----FirstlayerInstruction---//
AVMutableVideoCompositionLayerInstruction *FirstlayerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:firstTrack];
CGAffineTransform Scale = CGAffineTransformMakeScale(0.8f,1.0f);
CGAffineTransform Move = CGAffineTransformMakeTranslation(40,0);
[FirstlayerInstruction setTransform:CGAffineTransformConcat(Scale,Move) atTime:kCMTimeZero];
//----FirstlayerInstruction---//
AVMutableVideoCompositionLayerInstruction *SecondlayerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:secondTrack];
//
CGAffineTransform SecondScale = CGAffineTransformMakeScale(1.5f,1.5f);
CGAffineTransform SecondMove = CGAffineTransformMakeTranslation(0,0);;
[SecondlayerInstruction setTransform:CGAffineTransformConcat(SecondScale,SecondMove) atTime:kCMTimeZero];
MainInstruction.layerInstructions = [NSArray arrayWithObjects:FirstlayerInstruction,SecondlayerInstruction,nil];;
AVMutableVideoComposition *MainCompositionInst = [AVMutableVideoComposition videoComposition];
MainCompositionInst.instructions = [NSArray arrayWithObject:MainInstruction];
MainCompositionInst.frameDuration = CMTimeMake(1, 50);
MainCompositionInst.renderSize = CGSizeMake(firstTrack.naturalSize.width, firstTrack.naturalSize.height);
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *myPathDocs = [documentsDirectory stringByAppendingPathComponent:@"overlapVideotest.mov"];
if([[NSFileManager defaultManager] fileExistsAtPath:myPathDocs])
{
[[NSFileManager defaultManager] removeItemAtPath:myPathDocs error:nil];
}
NSURL *url = [NSURL fileURLWithPath:myPathDocs];
AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPreset1280x720];
exporter.outputURL=url;
[exporter setVideoComposition:MainCompositionInst];
exporter.outputFileType = AVFileTypeQuickTimeMovie;
[exporter exportAsynchronouslyWithCompletionHandler:^
{
dispatch_async(dispatch_get_main_queue(), ^{
[self exportDidFinish:exporter onViewController:vc];
});
}];
}
#pragma mark - Saving the final video to photo gallery here
- (void)exportDidFinish:(AVAssetExportSession*)session onViewController:(UIViewController*)vc {
if(session.status == AVAssetExportSessionStatusCompleted) {
NSURL *outputURL = session.outputURL;
ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
if([library videoAtPathIsCompatibleWithSavedPhotosAlbum:outputURL]) {
[library writeVideoAtPathToSavedPhotosAlbum:outputURL
completionBlock:^(NSURL *assetURL, NSError *error) {
dispatch_async(dispatch_get_main_queue(), ^{
[MBProgressHUD hideHUDForView:vc.view animated:true];
if (error) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Video Saving Failed" delegate:nil cancelButtonTitle:@"Ok" otherButtonTitles: nil, nil];
[alert show];
} else {
UIAlertView *alert = [[UIAlertView alloc]
initWithTitle:@"Video Saved" message:@"Saved To Photo Album" delegate:self cancelButtonTitle:@"Ok" otherButtonTitles: nil];
[alert show];
// [self loadMoviePlayer:outputURL];
}
});
}];
}
}else{
[MBProgressHUD hideHUDForView:vc.view animated:true];
NSLog(@"found an issue %@",session.error);
}
}
答案 0 :(得分：0)
您将不得不处理输入视频轨道的转换。首先，您必须获取输入视频轨的方向，并根据其对AVMutableCompositionLayerInstruction进行相对转换。 这是正确的方法。我用自己的代码库模拟了saveVideo方法。另外，我将渲染尺寸更改为720 x 720，以使其在所有不同分辨率的视频中看起来都更好。
在.h文件中获取direction和zoomOrientation对象，以在.m文件中全局使用它。就像AVCaptureVideoOrientation zoomOrientation，AVCaptureVideoOrientation方向一样。
-(void)saveVideosToPhotoAlbum:(AVURLAsset*)filteredasset andOriginalAsset:(AVURLAsset*)origAsset onViewController:(UIViewController*)vc{
AVMutableComposition* mixComposition = [[AVMutableComposition alloc] init];
//----first track---//
AVMutableCompositionTrack *firstTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
[firstTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, origAsset.duration) ofTrack:[[origAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:kCMTimeZero error:nil];
//----second track---//
AVMutableCompositionTrack *secondTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
[secondTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, filteredasset.duration) ofTrack:[[filteredasset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:kCMTimeZero error:nil];
AVMutableVideoCompositionInstruction * MainInstruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction];
MainInstruction.timeRange = CMTimeRangeMake(kCMTimeZero, origAsset.duration);
//----FirstlayerInstruction---//
AVMutableVideoCompositionLayerInstruction *FirstlayerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:firstTrack];
orientation = [self videoOrientation:origAsset];
zoomOrientation = [self videoOrientation:filteredasset];
BOOL isPortrait = NO;
switch (orientation) {
case AVCaptureVideoOrientationLandscapeRight:
isPortrait = NO;
break;
case AVCaptureVideoOrientationLandscapeLeft:
isPortrait = NO;
break;
case AVCaptureVideoOrientationPortrait:
isPortrait = YES;
break;
case AVCaptureVideoOrientationPortraitUpsideDown:
isPortrait = YES;
break;
default:
break;
}
CGSize naturalSize = firstTrack.naturalSize;
if(isPortrait){
naturalSize = CGSizeMake(naturalSize.height,naturalSize.width);
}
BOOL isZoomPortrait = NO;
switch (zoomOrientation) {
case AVCaptureVideoOrientationLandscapeRight:
isZoomPortrait = NO;
break;
case AVCaptureVideoOrientationLandscapeLeft:
isZoomPortrait = NO;
break;
case AVCaptureVideoOrientationPortrait:
isZoomPortrait = YES;
break;
case AVCaptureVideoOrientationPortraitUpsideDown:
isZoomPortrait = YES;
break;
default:
break;
}
CGSize zoomNaturalSize = secondTrack.naturalSize;
if(isZoomPortrait){
zoomNaturalSize = CGSizeMake(zoomNaturalSize.height,zoomNaturalSize.width);
}
CGFloat aspectWidth = 720/naturalSize.width;
CGFloat aspectheight = 720/naturalSize.height;
CGFloat zoomAspectWidth = 720/zoomNaturalSize.width;
CGFloat zoomAspectheight = 720/zoomNaturalSize.height;
CGFloat scale = MIN(aspectWidth, aspectheight);
CGFloat zoomScale = MAX(zoomAspectWidth, zoomAspectheight);
CGAffineTransform transform = [self transformFromOrientationWithVideoSizeWithAspect:naturalSize scale1:scale];
CGAffineTransform zoomTransform = [self zoomTransformFromOrientationWithVideoSizeWithAspect:zoomNaturalSize scale1:zoomScale];
[FirstlayerInstruction setTransform:transform atTime:kCMTimeZero];
//----FirstlayerInstruction---//
AVMutableVideoCompositionLayerInstruction *SecondlayerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:secondTrack];
[SecondlayerInstruction setTransform:zoomTransform atTime:kCMTimeZero];
MainInstruction.layerInstructions = [NSArray arrayWithObjects:FirstlayerInstruction,SecondlayerInstruction,nil];;
AVMutableVideoComposition *MainCompositionInst = [AVMutableVideoComposition videoComposition];
MainCompositionInst.instructions = [NSArray arrayWithObject:MainInstruction];
MainCompositionInst.frameDuration = CMTimeMake(1, 30);
MainCompositionInst.renderSize = CGSizeMake(720, 720);
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *myPathDocs = [documentsDirectory stringByAppendingPathComponent:@"overlapVideotest.mov"];
if([[NSFileManager defaultManager] fileExistsAtPath:myPathDocs])
{
[[NSFileManager defaultManager] removeItemAtPath:myPathDocs error:nil];
}
NSURL *url = [NSURL fileURLWithPath:myPathDocs];
AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetHighestQuality];
exporter.outputURL=url;
[exporter setVideoComposition:MainCompositionInst];
exporter.outputFileType = AVFileTypeQuickTimeMovie;
[exporter exportAsynchronouslyWithCompletionHandler:^
{
dispatch_async(dispatch_get_main_queue(), ^{
[self exportDidFinish:exporter onViewController:vc];
});
}];
}
- (CGAffineTransform)transformFromOrientationWithVideoSizeWithAspect:(CGSize)naturalSize scale1:(float)scale
{
CGAffineTransform transform = CGAffineTransformIdentity;
transform = CGAffineTransformScale(transform,scale,scale);
CGSize size = CGSizeMake(720.0, 720.0);
switch (orientation) {
case AVCaptureVideoOrientationLandscapeRight:
transform = CGAffineTransformTranslate(transform, (size.width/scale) / 2.0 - naturalSize.width/2.0, (size.height/scale) / 2.0 - naturalSize.height/2.0);
break;
case AVCaptureVideoOrientationLandscapeLeft:
transform = CGAffineTransformTranslate(transform,
naturalSize.width,
naturalSize.height);
transform = CGAffineTransformRotate(transform, M_PI);
if (naturalSize.width > naturalSize.height){
transform = CGAffineTransformTranslate(transform, 0, -((size.height/scale) / 2.0 - naturalSize.height/2.0));
}else{
//transform = transform.translatedBy(x: -((size.width/scale) / 2.0 - naturalSize.width/2.0), y: 0)
transform = CGAffineTransformTranslate(transform, -((size.width/scale) / 2.0 - naturalSize.width/2.0), 0);
}
break;
case AVCaptureVideoOrientationPortrait:
transform = CGAffineTransformTranslate(transform, naturalSize.width, 0);
transform = CGAffineTransformRotate(transform, M_PI_2);
//transform = transform.translatedBy(x: 0, y: -((size.width/scale) / 2.0 - naturalSize.width/2.0))
transform = CGAffineTransformTranslate(transform, 0, -((size.width/scale) / 2.0 - naturalSize.width/2.0));
break;
case AVCaptureVideoOrientationPortraitUpsideDown:
transform = CGAffineTransformTranslate(transform, 0, naturalSize.height);
// transform = CGAffineTransformTranslate(transform, 0, (naturalSize.width - naturalSize.height)/2);
transform = CGAffineTransformRotate(transform, -M_PI_2);
break;
default:
break;
}
return transform;
}
- (CGAffineTransform)zoomTransformFromOrientationWithVideoSizeWithAspect:(CGSize)naturalSize scale1:(float)scale
{
CGAffineTransform transform = CGAffineTransformIdentity;
transform = CGAffineTransformScale(transform,scale,scale);
CGSize size = CGSizeMake(720.0, 720.0);
switch (zoomOrientation) {
case AVCaptureVideoOrientationLandscapeRight:
transform = CGAffineTransformTranslate(transform, (size.width/scale) / 2.0 - naturalSize.width/2.0, (size.height/scale) / 2.0 - naturalSize.height/2.0);
break;
case AVCaptureVideoOrientationLandscapeLeft:
transform = CGAffineTransformTranslate(transform,
naturalSize.width,
naturalSize.height);
transform = CGAffineTransformRotate(transform, M_PI);
if (naturalSize.width > naturalSize.height){
transform = CGAffineTransformTranslate(transform, 0, -((size.height/scale) / 2.0 - naturalSize.height/2.0));
}else{
//transform = transform.translatedBy(x: -((size.width/scale) / 2.0 - naturalSize.width/2.0), y: 0)
transform = CGAffineTransformTranslate(transform, -((size.width/scale) / 2.0 - naturalSize.width/2.0), 0);
}
break;
case AVCaptureVideoOrientationPortrait:
transform = CGAffineTransformTranslate(transform, naturalSize.width, 0);
transform = CGAffineTransformRotate(transform, M_PI_2);
//transform = transform.translatedBy(x: 0, y: -((size.width/scale) / 2.0 - naturalSize.width/2.0))
transform = CGAffineTransformTranslate(transform, 0, -((size.width/scale) / 2.0 - naturalSize.width/2.0));
break;
case AVCaptureVideoOrientationPortraitUpsideDown:
transform = CGAffineTransformTranslate(transform, 0, naturalSize.height);
// transform = CGAffineTransformTranslate(transform, 0, (naturalSize.width - naturalSize.height)/2);
transform = CGAffineTransformRotate(transform, -M_PI_2);
break;
default:
break;
}
return transform;
}
-(AVCaptureVideoOrientation)videoOrientation:(AVAsset *)asset
{
AVCaptureVideoOrientation result = 0;
NSArray *tracks = [asset tracksWithMediaType:AVMediaTypeVideo];
if([tracks count] > 0) {
AVAssetTrack *videoTrack = [tracks objectAtIndex:0];
CGAffineTransform t = videoTrack.preferredTransform;
// Portrait
if(t.a == 0 && t.b == 1.0 && t.c == -1.0 && t.d == 0)
{
result = AVCaptureVideoOrientationPortrait;
}
// PortraitUpsideDown
if(t.a == 0 && t.b == -1.0 && t.c == 1.0 && t.d == 0) {
result = AVCaptureVideoOrientationPortraitUpsideDown;
}
// LandscapeRight
if(t.a == 1.0 && t.b == 0 && t.c == 0 && t.d == 1.0)
{
result = AVCaptureVideoOrientationLandscapeRight;
}
// LandscapeLeft
if(t.a == -1.0 && t.b == 0 && t.c == 0 && t.d == -1.0)
{
result = AVCaptureVideoOrientationLandscapeLeft;
}
}
return result;
}