エクスポート時のAVVideoCompositionCoreAnimationToolは、画像と音声のみを送信しますが、ビデオは送信しません。

Question

なぜ画像と音声のみを取得しているのですが、動画をエクスポートしないのは難しいです。どんな助けでも大歓迎です。ご覧のとおり、私もvideoCompositionCoreAnimationToolWithPostProcessingAsVideoLayerを使用しようとしましたが、エクスポート時にエラーが発生します。私はどちらの方法（videoCompositionCoreAnimationToolWithPostProcessingAsVideoLayerまたはvideoCompositionCoreAnimationToolWithAdditionalLayer）を使用するかを優先する必要はありません。笑。ご協力いただきありがとうございます。

#import "ThirdView.h" 


@implementation ThirdView 




- (void)viewDidLoad { 
imagePicker = [[UIImagePickerController alloc] init]; 
[super viewDidLoad]; 
} 

- (NSString *) filePath: (NSString *) fileName { 
NSArray *paths = NSSearchPathForDirectoriesInDomains(
                NSDocumentDirectory, NSUserDomainMask, YES); 
NSString *documentsDir = [paths objectAtIndex:0]; 
return [documentsDir stringByAppendingPathComponent:fileName]; 
} 



- (IBAction) btnClicked: (id) sender{ 
imagePicker.delegate = self;  

imagePicker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; 

NSArray *mediaTypes = 
[NSArray arrayWithObjects: (NSString *) kUTTypeMovie, nil]; 
imagePicker.mediaTypes = mediaTypes; 



//---show the Image Picker--  
[self presentModalViewController: imagePicker animated: YES] ; 


} 


- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { 

/// incoming video 
NSURL *videoURL = [info valueForKey:UIImagePickerControllerMediaURL]; 

/// UIImage into CALayer 
CALayer *aLayer = [CALayer layer]; 
aLayer.contents = (id) [UIImage imageNamed:@"test.png"].CGImage; 
aLayer.frame = CGRectMake(0, 0, 480, 320);  

/* only use with videoCompositionCoreAnimationToolWithPostProcessingAsVideoLayer 
CALayer *parentLayer = [CALayer layer]; 
CALayer *videoLayer = [CALayer layer]; 
parentLayer.frame = CGRectMake(0, 0, 480, 320); 
videoLayer.frame = CGRectMake(0, 0, 480, 320); 
[parentLayer addSublayer:videoLayer]; 
[parentLayer addSublayer:aLayer]; 
*/ 



AVURLAsset* url = [AVURLAsset URLAssetWithURL:videoURL options:nil]; 
AVMutableComposition *videoComposition = [AVMutableComposition composition]; 
NSError *error; 
NSFileManager *fileManager = [NSFileManager defaultManager]; 

AVMutableCompositionTrack *compositionVideoTrack = [videoComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid]; 

AVMutableCompositionTrack *compositionAudioTrack = [videoComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid]; 


AVAssetTrack *clipVideoTrack = [[url tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0]; 
[compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, [url duration]) ofTrack:clipVideoTrack atTime:kCMTimeZero error:&error]; 

AVAssetTrack *clipAudioTrack = [[url tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0]; 
[compositionAudioTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, [url duration]) ofTrack:clipAudioTrack atTime:kCMTimeZero error:&error];   

AVMutableVideoComposition* videoComp = [[AVMutableVideoComposition videoComposition] retain] ; 

videoComp.renderSize = CGSizeMake(480, 320); 
videoComp.frameDuration = CMTimeMake(1, 30); 
//videoComp.animationTool = [AVVideoCompositionCoreAnimationTool videoCompositionCoreAnimationToolWithPostProcessingAsVideoLayer:aLayer inLayer:parentLayer]; 

videoComp.animationTool = [AVVideoCompositionCoreAnimationTool videoCompositionCoreAnimationToolWithAdditionalLayer:aLayer asTrackID:2]; 




/// instruction 
AVMutableVideoCompositionInstruction *instruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction]; 
instruction.timeRange = CMTimeRangeMake(kCMTimeZero, CMTimeMakeWithSeconds(60, 30)); 
AVMutableVideoCompositionLayerInstruction* layerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:clipVideoTrack]; 
[layerInstruction setTrackID:2]; 
[layerInstruction setOpacity:1.0 atTime:kCMTimeZero ]; 
instruction.layerInstructions = [NSArray arrayWithObject:layerInstruction]; 
videoComp.instructions = [NSArray arrayWithObject: instruction]; 



/// outputs 
NSString *filePath = nil; 
filePath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; 
filePath = [filePath stringByAppendingPathComponent:@"temp.mov"]; 
NSLog(@"exporting to: %@", filePath); 
if ([fileManager fileExistsAtPath:filePath]) 
{ 
    BOOL success = [fileManager removeItemAtPath:filePath error:&error]; 
    if (!success) NSLog(@"FM error: %@", [error localizedDescription]); 
} 

/// exporting 
AVAssetExportSession *exporter; 
exporter = [[AVAssetExportSession alloc] initWithAsset:videoComposition presetName:AVAssetExportPresetHighestQuality] ; 
exporter.videoComposition = videoComp; 
exporter.outputURL=[NSURL fileURLWithPath:filePath]; 
exporter.outputFileType=AVFileTypeQuickTimeMovie; 





[statusLabel setText:@"processing..."]; 

[exporter exportAsynchronouslyWithCompletionHandler:^(void){ 
    switch (exporter.status) { 
     case AVAssetExportSessionStatusFailed: 
      NSLog(@"exporting failed"); 
      break; 
     case AVAssetExportSessionStatusCompleted: 
      NSLog(@"exporting completed"); 
      UISaveVideoAtPathToSavedPhotosAlbum(filePath, self, @selector (video:didFinishSavingWithError:contextInfo:), NULL); 
      break; 
     case AVAssetExportSessionStatusCancelled: 
      NSLog(@"export cancelled"); 
      break; 
    } 



}]; 



//---hide the Image Picker--- 

[picker dismissModalViewControllerAnimated:YES]; 

[exporter autorelease]; 

} 


- (void) video:(NSString *)videoPath 
didFinishSavingWithError: (NSError *) error 
contextInfo: (void *) contextInfo { 
NSLog(@"Finished saving video with error: %@", error); 
} 


- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker { 
//---user did not select image/video; hide the Image Picker--- 
[picker dismissModalViewControllerAnimated:YES]; 
} 

- (void)dealloc { 

[imagePicker release]; 
[super dealloc]; 
} 

- (void)didReceiveMemoryWarning { 
// Releases the view if it doesn't have a superview. 
[super didReceiveMemoryWarning]; 

// Release any cached data, images, etc that aren't in use. 
} 

- (void)viewDidUnload { 
// Release any retained subviews of the main view. 
// e.g. self.myOutlet = nil; 
} 


@end 

Answer 1

あなたは
exporter.audioMixを設定することで、音声合成にも輸出を提供する必要があります。