在視頻上進行圖像疊加時，iPhone AVErrorInvalidVideoComposition錯誤？

我已經將發現here的2個代碼塊合併爲一個實體塊（並通過Apple Developer Xcode教程文件驗證過程）。但是，當我運行它時，出現錯誤。它說：「操作無法完成（AVFoundationErrorDomain錯誤-11841）」在視頻上進行圖像疊加時，iPhone AVErrorInvalidVideoComposition錯誤？

錯誤域= AVFoundationErrorDomain代碼= -11841

任何想法，爲什麼它拋出一個AVErrorInvalidVideoComposition錯誤？謝謝！（我是新來的，請告訴我是否需要更多信息。）

NSURL *videoURL = [info valueForKey:UIImagePickerControllerMediaURL]; 

/// UIImage into CALayer 
UIImage *myImage = [UIImage imageNamed:@"Test.png"]; 
CALayer *aLayer = [CALayer layer]; 
aLayer.contents = (id)myImage.CGImage; 

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

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

AVMutableVideoComposition* videoComp = [[AVMutableVideoComposition alloc] init]; 
videoComp.renderSize = CGSizeMake(640, 480); 
videoComp.frameDuration = CMTimeMake(1, 30); 
CALayer *parentLayer = [CALayer layer]; 
CALayer *videoLayer = [CALayer layer]; 
parentLayer.frame = CGRectMake(0, 0, videoComp.renderSize.width, videoComp.renderSize.height); 
videoLayer.frame = CGRectMake(0, 0, videoComp.renderSize.width, videoComp.renderSize.height); 
[parentLayer addSublayer:videoLayer]; 
[parentLayer addSublayer:aLayer]; 
videoComp.animationTool = [AVVideoCompositionCoreAnimationTool videoCompositionCoreAnimationToolWithPostProcessingAsVideoLayer:videoLayer inLayer:parentLayer]; 


/// instruction 
AVMutableVideoCompositionInstruction *instruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction]; 
instruction.timeRange = CMTimeRangeMake(kCMTimeZero, CMTimeMakeWithSeconds(60, 30)); 
AVMutableVideoCompositionLayerInstruction* layerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:clipVideoTrack]; 
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; 


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

來源

2012-01-09 Christian Reich

您是否設法找到問題所在？ – yonix 2012-04-30 13:15:41

Geez。我認爲Java有很長的變量名稱。 – icedwater 2015-07-03 02:25:28

無效合成的一個常見問題是時間。

如果您合併的各種資產的長度不相同，請確保您創建的作品覆蓋整個細分受衆羣。

檢查以確保您AVMutableVideoCompositionInstruction的timeRange是正確的。

來源

2012-09-25 00:24:45 Hunter

在視頻上進行圖像疊加時，iPhone AVErrorInvalidVideoComposition錯誤？

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