Make movie file with picture Array and song file, using AVAsset

The AVChannelLayoutKey should point to an NSData instance containing an AudioChannelLayout.

Yours points to an NSNumber.

I finally found how make movie with a picture array and an audio file. So if you want do the same thing I put my code here (be careful to memory):

• First make a movie file with your picture array use zoul's post here:

  -(void) writeImagesToMovieAtPath:(NSString *) path withSize:(CGSize) size
  {
    NSString *documentsDirectoryPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
    NSArray *dirContents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:documentsDirectoryPath error:nil];
    for (NSString *tString in dirContents) 
    {
      if ([tString isEqualToString:@"essai.mp4"]) 
      {
          [[NSFileManager defaultManager]removeItemAtPath:[NSString stringWithFormat:@"%@/%@",documentsDirectoryPath,tString] error:nil];
  
      }
    }
  
    NSLog(@"Write Started");
  
    NSError *error = nil;
  
    AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:
                                [NSURL fileURLWithPath:path] fileType:AVFileTypeMPEG4
                                                            error:&error];    
    NSParameterAssert(videoWriter);
  
    NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
                                 AVVideoCodecH264, AVVideoCodecKey,
                                 [NSNumber numberWithInt:size.width], AVVideoWidthKey,
                                 [NSNumber numberWithInt:size.height], AVVideoHeightKey,
                                 nil];
  
  
    AVAssetWriterInput* videoWriterInput = [[AVAssetWriterInput
                                           assetWriterInputWithMediaType:AVMediaTypeVideo
                                           outputSettings:videoSettings] retain];
  
  
  
  
    AVAssetWriterInputPixelBufferAdaptor *adaptor = [AVAssetWriterInputPixelBufferAdaptor
                                                   assetWriterInputPixelBufferAdaptorWithAssetWriterInput:videoWriterInput
                                                   sourcePixelBufferAttributes:nil];
  
    NSParameterAssert(videoWriterInput);
  
    NSParameterAssert([videoWriter canAddInput:videoWriterInput]);
    videoWriterInput.expectsMediaDataInRealTime = YES;
    [videoWriter addInput:videoWriterInput];
    //Start a session:
    [videoWriter startWriting];
    [videoWriter startSessionAtSourceTime:kCMTimeZero];
  
  
    //Video encoding
  
    CVPixelBufferRef buffer = NULL;
  
    //convert uiimage to CGImage.
  
    int frameCount = 0;
  
    for(int i = 0; i<[m_PictArray count]; i++)
    {
      buffer = [self pixelBufferFromCGImage:[[m_PictArray objectAtIndex:i] CGImage] andSize:size];
  
  
      BOOL append_ok = NO;
      int j = 0;
      while (!append_ok && j < 30) 
      {
          if (adaptor.assetWriterInput.readyForMoreMediaData) 
          {
              printf("appending %d attemp %d\n", frameCount, j);
  
              CMTime frameTime = CMTimeMake(frameCount,(int32_t) 10);
  
              append_ok = [adaptor appendPixelBuffer:buffer withPresentationTime:frameTime];
              CVPixelBufferPoolRef bufferPool = adaptor.pixelBufferPool;
              NSParameterAssert(bufferPool != NULL);
  
              [NSThread sleepForTimeInterval:0.05];
          } 
          else 
          {
              printf("adaptor not ready %d, %d\n", frameCount, j);
              [NSThread sleepForTimeInterval:0.1];
          }
          j++;
      }
      if (!append_ok) 
      {
          printf("error appending image %d times %d\n", frameCount, j);
      }
      frameCount++;
      CVBufferRelease(buffer);
    }
  
    [videoWriterInput markAsFinished];
    [videoWriter finishWriting];
  
    [videoWriterInput release];
    [videoWriter release];
  
    [m_PictArray removeAllObjects];
  
    NSLog(@"Write Ended"); 
  }
  

• After that you must put together movie file and audio file. To do this follow my code:

  -(void)CompileFilesToMakeMovie
  {
    AVMutableComposition* mixComposition = [AVMutableComposition composition];
  
    NSString* audio_inputFileName = @"deformed.caf";
    NSString* audio_inputFilePath = [Utilities documentsPath:audio_inputFileName];
    NSURL*    audio_inputFileUrl = [NSURL fileURLWithPath:audio_inputFilePath];
  
    NSString* video_inputFileName = @"essai.mp4";
    NSString* video_inputFilePath = [Utilities documentsPath:video_inputFileName];
    NSURL*    video_inputFileUrl = [NSURL fileURLWithPath:video_inputFilePath];
  
    NSString* outputFileName = @"outputFile.mov";
    NSString* outputFilePath = [Utilities documentsPath:outputFileName];
    NSURL*    outputFileUrl = [NSURL fileURLWithPath:outputFilePath];
  
    if ([[NSFileManager defaultManager] fileExistsAtPath:outputFilePath]) 
      [[NSFileManager defaultManager] removeItemAtPath:outputFilePath error:nil];
  
  
  
    CMTime nextClipStartTime = kCMTimeZero;
  
    AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:video_inputFileUrl options:nil];
    CMTimeRange video_timeRange = CMTimeRangeMake(kCMTimeZero,videoAsset.duration);
    AVMutableCompositionTrack *a_compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
    [a_compositionVideoTrack insertTimeRange:video_timeRange ofTrack:[[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] atTime:nextClipStartTime error:nil];
  
    //nextClipStartTime = CMTimeAdd(nextClipStartTime, a_timeRange.duration);
  
    AVURLAsset* audioAsset = [[AVURLAsset alloc]initWithURL:audio_inputFileUrl options:nil];
    CMTimeRange audio_timeRange = CMTimeRangeMake(kCMTimeZero, audioAsset.duration);
    AVMutableCompositionTrack *b_compositionAudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio preferredTrackID:kCMPersistentTrackID_Invalid];
    [b_compositionAudioTrack insertTimeRange:audio_timeRange ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] atTime:nextClipStartTime error:nil];
  
  
  
    AVAssetExportSession* _assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetHighestQuality];   
    _assetExport.outputFileType = @"com.apple.quicktime-movie";
    _assetExport.outputURL = outputFileUrl;
  
    [_assetExport exportAsynchronouslyWithCompletionHandler:
   ^(void ) {
       [self saveVideoToAlbum:outputFilePath]; 
   }       
   ];  
  }
  

Sorry if there are some leak, I'm doing the optimization of memory.