AVErrorInvalidVideoComposition = -11841

Question

I am combining several videos and several compositions, and I get the bot what is wrong in the code, because the same code worked absolutely fine yesterday, but today I get the following answer AVAssetExportSessionStatus = 4,error = Error Domain=AVFoundationErrorDomain Code=-11841 "The operation couldn't be completed. (AVFoundationErrorDomain error -11841.)" I did some research and found that the export was failing due to invalid video composition. Please find out what is wrong with the video composition.

 - (void)mergeAllselectedVideos { NSArray *pathArray = [DocumentDirectory getUrlFromDocumentDirectoryOfList:self.selectedClipsArray]; AVMutableComposition *mixComposition = [[AVMutableComposition alloc]init]; NSMutableArray *layerinstructions = [[NSMutableArray alloc]init]; CMTime time = kCMTimeZero; CMTime previousSongDuration = kCMTimeZero; for (int i = 0 ; i < pathArray.count; i++) { //VIDEO TRACK// time = CMTimeAdd(time, previousSongDuration); NSURL *url = [NSURL URLWithString:[pathArray objectAtIndex:i]]; AVAsset *avAsset = [AVAsset assetWithURL:url]; AVMutableCompositionTrack *track = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid]; [track insertTimeRange:CMTimeRangeMake(kCMTimeZero, avAsset.duration) ofTrack:[[avAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:time error:nil]; previousSongDuration = avAsset.duration; } CMTime audioTime = kCMTimeZero; for (int i = 0; i < self.selectedSongsArray.count; i++) { MPMediaItem * songItem = [self.selectedSongsArray objectAtIndex:i]; NSURL *songURL = [songItem valueForProperty: MPMediaItemPropertyAssetURL]; AVAsset *audioAsset = [AVAsset assetWithURL:songURL]; AVMutableCompositionTrack *AudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid]; CMTimeRange timeRange = CMTimeRangeMake(audioTime, audioAsset.duration); if(CMTimeGetSeconds(CMTimeAdd(audioTime, audioAsset.duration)) > CMTimeGetSeconds(time)) { timeRange = CMTimeRangeMake(audioTime, CMTimeSubtract(time,audioTime)); } [AudioTrack insertTimeRange:timeRange ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] atTime:kCMTimeZero error:nil]; audioTime = CMTimeAdd(audioTime, audioAsset.duration); } AVMutableVideoCompositionInstruction * MainInstruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction]; MainInstruction.timeRange = CMTimeRangeMake(kCMTimeZero, time); MainInstruction.layerInstructions = layerinstructions; AVMutableVideoComposition *MainCompositionInst = [AVMutableVideoComposition videoComposition]; MainCompositionInst.instructions = [NSArray arrayWithObject:MainInstruction]; MainCompositionInst.frameDuration = CMTimeMake(1, 30); MainCompositionInst.renderSize = CGSizeMake(320.0, 480.0); NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); NSString *documentsDirectory = [paths objectAtIndex:0]; movieName = [CoreDataFunctions getNameForMovieForDate:[CalendarFunctions getCurrentDateString]]; self.moviePlayButton.titleLabel.text = movieName; NSString *myPathDocs = [documentsDirectory stringByAppendingPathComponent:movieName]; NSURL *url = [NSURL fileURLWithPath:myPathDocs]; AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetHighestQuality]; exporter.outputURL=url; exporter.outputFileType = AVFileTypeQuickTimeMovie; exporter.videoComposition = MainCompositionInst; exporter.shouldOptimizeForNetworkUse = YES; [exporter exportAsynchronouslyWithCompletionHandler:^{dispatch_async(dispatch_get_main_queue(), ^{[self exportDidFinish:exporter];});}]; } - (void)exportDidFinish:(AVAssetExportSession*)session { //Printing error NSLog(@"AVAssetExportSessionStatus = %i,error = %@",session.status,session.error); } 

Answer 1

I found your question having the same problem. My theory on this problem is that all the properties of the composition of the videos are not set during export, so they disappear. Here's the stanza I'm using now, which now leads to error-free export:

 AVMutableVideoComposition *videoComposition = [AVMutableVideoComposition videoComposition]; videoComposition.frameDuration = CMTimeMake(1,30); videoComposition.renderScale = 1.0; videoComposition.renderSize = CGSizeMake(352.0, 288.0); instruction.layerInstructions = [NSArray arrayWithObject: layerInstruction]; instruction.timeRange = CMTimeRangeMake(kCMTimeZero, videoAsset.duration); videoComposition.instructions = [NSArray arrayWithObject: instruction]; 

In my case, I was missing the timeRange property in the statement. Check your own properties to make sure they get the correct values. Good luck It's complicated.

Answer 2

You need to set opacity for the first LayerInstruction , for example:

 [FirstlayerInstruction setOpacity:0.0 atTime:firstAsset.duration];