crea video desde una matriz de UIImages y guarda el video en la biblioteca de iPhone. AVAssetLibrary + AVFoundation

Question

Problema al guardar video en la biblioteca de iPhone. tengo una serie de UIImages, y dos botones, "convertToVideo" & "saveToiPhoneLib"

 

-(IBAction) convertToVideo 
{ 
    NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES); 

NSString *documentsDirectory = ([paths count] > 0) ? [paths objectAtIndex:0] : nil; 

NSString *savedVideoPath = [documentsDirectory stringByAppendingPathComponent:@"videoOutput"]; 

printf(" \n\n\n-Video file == %s--\n\n\n",[savedVideoPath UTF8String]); 

[self writeImageAsMovie:imageArray toPath:savedVideoPath size:self.view.frame.size duration:3]; 
} 


here i'm passing the imageArray and savedVideoPath to the function below 


-(void)writeImageAsMovie:(NSArray *)array toPath:(NSString*)path size:(CGSize)size duration:(int)duration 
{ 

NSError *error = nil; 

AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL: 
      [NSURL fileURLWithPath:path] fileType:AVFileTypeQuickTimeMovie 
       error:&error]; 


NSParameterAssert(videoWriter); 

NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys: 
      AVVideoCodecH264, AVVideoCodecKey, 
      [NSNumber numberWithInt:size.width], AVVideoWidthKey, 
      [NSNumber numberWithInt:size.height], AVVideoHeightKey, 
      nil]; 
AVAssetWriterInput* writerInput = [[AVAssetWriterInput 
      assetWriterInputWithMediaType:AVMediaTypeVideo 
      outputSettings:videoSettings] retain]; 


// NSDictionary *bufferAttributes = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithInt:kCVPixelFormatType_32ARGB], kCVPixelBufferPixelFormatTypeKey, nil]; 

AVAssetWriterInputPixelBufferAdaptor *adaptor = [AVAssetWriterInputPixelBufferAdaptor 
       assetWriterInputPixelBufferAdaptorWithAssetWriterInput:writerInput 
       sourcePixelBufferAttributes:nil]; 


NSParameterAssert(writerInput); 
NSParameterAssert([videoWriter canAddInput:writerInput]); 
[videoWriter addInput:writerInput]; 


//Start a session: 
[videoWriter startWriting]; 
[videoWriter startSessionAtSourceTime:kCMTimeZero]; 

CVPixelBufferRef buffer = NULL; 

//convert uiimage to CGImage. 

buffer = [self pixelBufferFromCGImage:[[array objectAtIndex:0] CGImage]]; 
[adaptor appendPixelBuffer:buffer withPresentationTime:kCMTimeZero]; 

//Write samples: 
...... 


//Finish the session: 
[writerInput markAsFinished]; 
[videoWriter finishWriting]; 
} 


generate a CVPixelBufferRef here 


- (CVPixelBufferRef) pixelBufferFromCGImage: (CGImageRef) image 
{ 
    NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys: 
     [NSNumber numberWithBool:YES], kCVPixelBufferCGImageCompatibilityKey, 
     [NSNumber numberWithBool:YES], kCVPixelBufferCGBitmapContextCompatibilityKey, 
     nil]; 
    CVPixelBufferRef pxbuffer = NULL; 

    CVReturn status = CVPixelBufferCreate(kCFAllocatorDefault, self.view.frame.size.width, 
      self.view.frame.size.height, kCVPixelFormatType_32ARGB, (CFDictionaryRef) options, 
      &pxbuffer); 
    NSParameterAssert(status == kCVReturnSuccess && pxbuffer != NULL); 

    CVPixelBufferLockBaseAddress(pxbuffer, 0); 
    void *pxdata = CVPixelBufferGetBaseAddress(pxbuffer); 
    NSParameterAssert(pxdata != NULL); 

    CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB(); 
    CGContextRef context = CGBitmapContextCreate(pxdata, self.view.frame.size.width, 
      self.view.frame.size.height, 8, 4*self.view.frame.size.width, rgbColorSpace, 
      kCGImageAlphaNoneSkipFirst); 
    NSParameterAssert(context); 
    CGContextConcatCTM(context, CGAffineTransformMakeRotation(0)); 
    CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(image), 
      CGImageGetHeight(image)), image); 
    CGColorSpaceRelease(rgbColorSpace); 
    CGContextRelease(context); 

    CVPixelBufferUnlockBaseAddress(pxbuffer, 0); 

    return pxbuffer; 
} 

guardar en la biblioteca iPhone

 

-(IBAction) saveToiPhoneLib 
{ 

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSCachesDirectory, NSUserDomainMask, YES); 

NSString *basePath = ([paths count] > 0) ? [paths objectAtIndex:0] : nil; 

NSString *getImagePath = [basePath stringByAppendingPathComponent:@"videoOutput"]; 

printf(" \n\n\n-Video file == %s--\n\n\n",[getImagePath UTF8String]); 

UISaveVideoAtPathToSavedPhotosAlbum (getImagePath,self, @selector(video:didFinishSavingWithError: contextInfo:), nil); 
} 


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

pero mientras que el ahorro im que consigue el mensaje de error: -

Finalizó el guardado de video con error: Dominio de error = ALAssetsLibraryErrorDomain Code = -3302 "Datos no válidos" UserInfo = 0x1d59f0 {NSLocalizedFailureReason = Hubo un problema al escribir este activo porque los datos no son válidos y no se pueden ver ni pla yed., NSLocalizedRecoverySuggestion = Pruebe con datos diferentes, NSLocalizedDescription = Datos no válidos}

por favor avíseme sobre mi error. gracias de antemano

Answer 1

Eso es simplemente demasiado código para comprobar si hay errores. Asegúrese de que puede iniciar la sesión de exportación, que realmente obtiene búferes de píxeles para sus imágenes, que el escritor está listo para recibir más datos, que el búfer se adjunta sin errores, que la sesión de exportación finaliza con éxito y que el archivo de salida de la película existe y en realidad contiene algunos datos. Solo entonces puedes intentar guardarlo en el álbum de fotos del sistema. Revise toda la información de error disponible en el camino para que sepa dónde se rompe la cosa por primera vez. (. Otra cosa es que usted simplemente está tomando el código de la web y pegarlo en conjunto, que es simplemente no va a trabajar para la programación AV)

Answer 2

Sí, tenía el mismo error:

Error Domain=AVFoundationErrorDomain Code=-11823 "Cannot Save" UserInfo=0x193ce0 {NSLocalizedRecoverySuggestion=Try saving again., NSUnderlyingError=0x179e40 "The operation couldn’t be completed. (OSStatus error -12412.)", NSLocalizedDescription=Cannot Save} 

Pero solo en el simulador, cuando ejecuté en un dispositivo, el guardar en la biblioteca de fotos funcionó bien.

Answer 3

-(void)convertimagetoVideo 
{ 
    ///////////// setup OR function def if we move this to a separate function //////////// 
    // this should be moved to its own function, that can take an imageArray, videoOutputPath, etc... 


NSError *error = nil; 


// set up file manager, and file videoOutputPath, remove "test_output.mp4" if it exists... 
//NSString *videoOutputPath = @"/Users/someuser/Desktop/test_output.mp4"; 
NSFileManager *fileMgr = [NSFileManager defaultManager]; 
NSString *documentsDirectory = [NSHomeDirectory() 
           stringByAppendingPathComponent:@"Documents"]; 
NSString *videoOutputPath = [documentsDirectory stringByAppendingPathComponent:@"test_output.mp4"]; 
//NSLog(@"-->videoOutputPath= %@", videoOutputPath); 
// get rid of existing mp4 if exists... 
if ([fileMgr removeItemAtPath:videoOutputPath error:&error] != YES) 
    NSLog(@"Unable to delete file: %@", [error localizedDescription]); 


CGSize imageSize = CGSizeMake(400, 200); 
// NSUInteger fps = 30; 
    NSUInteger fps = 30; 

//NSMutableArray *imageArray; 
//imageArray = [[NSMutableArray alloc] initWithObjects:@"download.jpeg", @"download2.jpeg", nil]; 
NSMutableArray *imageArray; 
NSArray* imagePaths = [[NSBundle mainBundle] pathsForResourcesOfType:@"png" inDirectory:nil]; 
imageArray = [[NSMutableArray alloc] initWithCapacity:imagePaths.count]; 
NSLog(@"-->imageArray.count= %i", imageArray.count); 
for (NSString* path in imagePaths) 
{ 
    [imageArray addObject:[UIImage imageWithContentsOfFile:path]]; 
    //NSLog(@"-->image path= %@", path); 
} 

//////////////  end setup /////////////////////////////////// 

NSLog(@"Start building video from defined frames."); 

AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL: 
           [NSURL fileURLWithPath:videoOutputPath] fileType:AVFileTypeQuickTimeMovie 
                  error:&error]; 
NSParameterAssert(videoWriter); 

NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys: 
           AVVideoCodecH264, AVVideoCodecKey, 
           [NSNumber numberWithInt:imageSize.width], AVVideoWidthKey, 
           [NSNumber numberWithInt:imageSize.height], AVVideoHeightKey, 
           nil]; 

AVAssetWriterInput* videoWriterInput = [AVAssetWriterInput 
             assetWriterInputWithMediaType:AVMediaTypeVideo 
             outputSettings:videoSettings]; 


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]; 

CVPixelBufferRef buffer = NULL; 

//convert uiimage to CGImage. 
int frameCount = 0; 
double numberOfSecondsPerFrame = 6; 
double frameDuration = fps * numberOfSecondsPerFrame; 

//for(VideoFrame * frm in imageArray) 
NSLog(@"**************************************************"); 
for(UIImage * img in imageArray) 
{ 
    //UIImage * img = frm._imageFrame; 
    buffer = [self pixelBufferFromCGImage:[img CGImage]]; 

    BOOL append_ok = NO; 
    int j = 0; 
    while (!append_ok && j < 30) { 
     if (adaptor.assetWriterInput.readyForMoreMediaData) { 
      //print out status: 
      NSLog(@"Processing video frame (%d,%d)",frameCount,[imageArray count]); 

      //CMTime frameTime = CMTimeMake((int64_t), (int32_t)2); 

      CMTime frameTime = CMTimeMake(frameCount*frameDuration,(int32_t) fps); 
      NSLog(@"seconds = %f, %u, %d", CMTimeGetSeconds(frameTime),fps,j); 
      append_ok = [adaptor appendPixelBuffer:buffer withPresentationTime:frameTime]; 
      if(!append_ok){ 
       NSError *error = videoWriter.error; 
       if(error!=nil) { 
        NSLog(@"Unresolved error %@,%@.", error, [error userInfo]); 
       } 
      } 
     } 
     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, with error.", frameCount, j); 
    } 
    frameCount++; 
} 
NSLog(@"**************************************************"); 

//Finish the session: 
[videoWriterInput markAsFinished]; 
[videoWriter finishWriting]; 
NSLog(@"Write Ended"); 

} 


-(void)CompileFilestomakeVideo 
{ 

    // set up file manager, and file videoOutputPath, remove "test_output.mp4" if it exists... 
    //NSString *videoOutputPath = @"/Users/someuser/Desktop/test_output.mp4"; 
    NSString *documentsDirectory = [NSHomeDirectory() 
            stringByAppendingPathComponent:@"Documents"]; 
    NSString *videoOutputPath = [documentsDirectory stringByAppendingPathComponent:@"test_output.mp4"]; 
    //NSLog(@"-->videoOutputPath= %@", videoOutputPath); 
    // get rid of existing mp4 if exists... 

    AVMutableComposition* mixComposition = [AVMutableComposition composition]; 

    NSString *bundleDirectory = [[NSBundle mainBundle] bundlePath]; 
    // audio input file... 
    NSString *audio_inputFilePath = [bundleDirectory stringByAppendingPathComponent:@"30secs.mp3"]; 
    NSURL *audio_inputFileUrl = [NSURL fileURLWithPath:audio_inputFilePath]; 

    // this is the video file that was just written above, full path to file is in --> videoOutputPath 
    NSURL *video_inputFileUrl = [NSURL fileURLWithPath:videoOutputPath]; 

    // create the final video output file as MOV file - may need to be MP4, but this works so far... 
    NSString *outputFilePath = [documentsDirectory stringByAppendingPathComponent:@"final_video.mp4"]; 
    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.outputFileType = @"public.mpeg-4"; 
    //NSLog(@"support file types= %@", [_assetExport supportedFileTypes]); 
    _assetExport.outputURL = outputFileUrl; 

    [_assetExport exportAsynchronouslyWithCompletionHandler: 
    ^(void) { 
     [self saveVideoToAlbum:outputFilePath]; 
    } 
    ]; 

    ///// THAT IS IT DONE... the final video file will be written here... 
    NSLog(@"DONE.....outputFilePath--->%@", outputFilePath); 

    // the final video file will be located somewhere like here: 
    // /Users/caferrara/Library/Application Support/iPhone Simulator/6.0/Applications/D4B12FEE-E09C-4B12-B772-7F1BD6011BE1/Documents/outputFile.mov 


    //////////////////////////////////////////////////////////////////////////// 
    //////////////////////////////////////////////////////////////////////////// 
} 
- (void) saveVideoToAlbum:(NSString*)path { 

    NSLog(@"saveVideoToAlbum"); 

    if(UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(path)){ 
     UISaveVideoAtPathToSavedPhotosAlbum (path, self, @selector(video:didFinishSavingWithError: contextInfo:), nil); 
    } 
} 

-(void) video:(NSString *)videoPath didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo { 
    if(error) 
     NSLog(@"error: %@", error); 
    else 
     NSLog(@" OK"); 
} 



//////////////////////// 
- (CVPixelBufferRef) pixelBufferFromCGImage: (CGImageRef) image { 

    CGSize size = CGSizeMake(400, 200); 

    NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys: 
          [NSNumber numberWithBool:YES], kCVPixelBufferCGImageCompatibilityKey, 
          [NSNumber numberWithBool:YES], kCVPixelBufferCGBitmapContextCompatibilityKey, 
          nil]; 
    CVPixelBufferRef pxbuffer = NULL; 

    CVReturn status = CVPixelBufferCreate(kCFAllocatorDefault, 
              size.width, 
              size.height, 
              kCVPixelFormatType_32ARGB, 
              (__bridge CFDictionaryRef) options, 
              &pxbuffer); 
    if (status != kCVReturnSuccess){ 
     NSLog(@"Failed to create pixel buffer"); 
    } 

    CVPixelBufferLockBaseAddress(pxbuffer, 0); 
    void *pxdata = CVPixelBufferGetBaseAddress(pxbuffer); 

    CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB(); 
    CGContextRef context = CGBitmapContextCreate(pxdata, size.width, 
               size.height, 8, 4*size.width, rgbColorSpace, 
               kCGImageAlphaPremultipliedFirst); 
    //kCGImageAlphaNoneSkipFirst); 
    CGContextConcatCTM(context, CGAffineTransformMakeRotation(0)); 
    CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(image), 
              CGImageGetHeight(image)), image); 
    CGColorSpaceRelease(rgbColorSpace); 
    CGContextRelease(context); 

    CVPixelBufferUnlockBaseAddress(pxbuffer, 0); 

    return pxbuffer; 
} 

Answer 4

usar el siguiente código

 
 

- (void)creatingVideo { 

    //get full path of video file from documents directory 
    NSError *error = nil; 
    NSFileManager *fileMgr = [NSFileManager defaultManager]; 
    NSString *documentsDirectory = [self applicationDocumentsDirectory]; 
    NSString *videoOutputPath = [documentsDirectory stringByAppendingPathComponent:@"test_output.mov"]; 

    // get rid of existing mp4 if exists... 
    if ([fileMgr removeItemAtPath:videoOutputPath error:&error] != YES) 
     NSLog(@"Unable to delete file it does not exits on path"); 

    //size of the video frame 
    CGSize imageSize = CGSizeMake(640,480); 
    //CGSize imageSize = CGSizeMake(1280, 720); 

    //frame per second 
    NSUInteger fps = 30; 

    NSLog(@"Start building video from defined frames."); 


    //AvAsset library to create video of images 
    AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:[NSURL fileURLWithPath:videoOutputPath] fileType:AVFileTypeQuickTimeMovie error:&error]; 
    NSParameterAssert(videoWriter); 
    NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys: AVVideoCodecH264, AVVideoCodecKey, [NSNumber numberWithInt:imageSize.width], AVVideoWidthKey,[NSNumber numberWithInt:imageSize.height], AVVideoHeightKey,nil]; 

    AVAssetWriterInput* videoWriterInput = [[AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:videoSettings] retain]; 
    NSDictionary *bufferAttributes = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithInt:kCVPixelFormatType_32ARGB], kCVPixelBufferPixelFormatTypeKey, nil]; 
    AVAssetWriterInputPixelBufferAdaptor *adaptor = [AVAssetWriterInputPixelBufferAdaptor assetWriterInputPixelBufferAdaptorWithAssetWriterInput:videoWriterInput sourcePixelBufferAttributes:bufferAttributes]; 

    NSParameterAssert(videoWriterInput); 
    NSParameterAssert([videoWriter canAddInput:videoWriterInput]); 

    videoWriterInput.expectsMediaDataInRealTime = YES; 
    [videoWriter addInput:videoWriterInput]; 

    //Start a session: 
    [videoWriter startWriting]; 
    [videoWriter startSessionAtSourceTime:kCMTimeZero]; 

    CVPixelBufferRef buffer = NULL; 

    //frameCount. 
    int frameCount = 0; 
    double frameDuration; 
    double numberOfSecondsPerFrame = appDelegate.delaySecond; 

    NSLog(@"**************************video creation started********************************"); 
    for (int i = 0; i<[self.arrImageDataDict count]; i++) { 
     { 
      @autoreleasepool{ 
       UIImage *img1 = nil; 

       img1 = [self getImageForVideoCreation:i]; 

       buffer = [self pixelBufferFromCGImage: [img1 CGImage]]; 
       if (buffer == NULL) { 
        NSLog(@"Pixel buffer not created"); 
       } else { 
        BOOL append_ok = NO; 
        int j = 0; 
        while (!append_ok && j < 20) { 
         if (adaptor.assetWriterInput.readyForMoreMediaData) { 
          //print out status: 
          NSLog(@"Processing video frame (%d,%d) delay %f",frameCount,[self.arrImageDataDict count],numberOfSecondsPerFrame); 
          frameDuration = fps * numberOfSecondsPerFrame; 
          CMTime frameTime = CMTimeMake(frameCount*frameDuration,(int32_t) fps); 
          append_ok = [adaptor appendPixelBuffer:buffer withPresentationTime:frameTime]; 
          if(!append_ok){ 
           NSError *error = videoWriter.error; 
           if(error!=nil) { 
            NSLog(@"Unresolved error %@,%@.", error, [error userInfo]); 
           } 
          } 
         } 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, with error.", frameCount, j); 
        } 
        frameCount++; 
        CVPixelBufferRelease(buffer); 
        buffer = nil; 
       } 
      } 
     } 
    } 

    //Finish the session: 
    [videoWriterInput markAsFinished]; 

    //get the iOS version of the device 
    float version = [[[UIDevice currentDevice] systemVersion] floatValue]; 
    if (version < 6.0) 
    { 
     [videoWriter finishWriting]; 
     //NSLog (@"finished writing iOS version:%f",version); 

    } else { 
     [videoWriter finishWritingWithCompletionHandler:^(){ 
      //NSLog (@"finished writing iOS version:%f",version); 
     }]; 
    } 

    CVPixelBufferPoolRelease(adaptor.pixelBufferPool); 
    [videoWriter release]; 
    [videoWriterInput release]; 

    //OK now add an audio file to move file 
    AVMutableComposition* mixComposition = [AVMutableComposition composition]; 

    //Get the saved audio song path to merge it in video 
    NSURL *audio_inputFileUrl ; 
    NSString *filePath = [self applicationDocumentsDirectory]; 
    NSString *outputFilePath1 = [filePath stringByAppendingPathComponent:@"mySong.m4a"]; 
    audio_inputFileUrl = [[NSURL alloc]initFileURLWithPath:outputFilePath1]; 

    // this is the video file that was just written above 
    NSURL *video_inputFileUrl = [[NSURL alloc]initFileURLWithPath:videoOutputPath];; 

    [NSThread sleepForTimeInterval:2.0]; 

    // create the final video output file as MOV file - may need to be MP4, but this works so far... 
    NSString *outputFilePath = [documentsDirectory stringByAppendingPathComponent:@"Slideshow_video.mov"]; 
    NSURL *outputFileUrl = [[NSURL alloc]initFileURLWithPath:outputFilePath]; 

    if ([[NSFileManager defaultManager] fileExistsAtPath:outputFilePath]) 
     [[NSFileManager defaultManager] removeItemAtPath:outputFilePath error:nil]; 

    //AVURLAsset get video without audio 
    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:kCMTimeZero error:nil]; 
    [videoAsset release]; 

    [NSThread sleepForTimeInterval:3.0]; 

    //If audio song merged 
    if (![self.appDelegate.musicFilePath isEqualToString:@"Not set"]) 
    { 
     //*************************make sure all exception is off*********************** 
     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]; 

     if (![audioAsset tracksWithMediaType:AVMediaTypeAudio].count == 0) { 
      [b_compositionAudioTrack insertTimeRange:audio_timeRange ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] atTime:kCMTimeZero error:nil]; 
     } 
     [audioAsset release]; 
    } 

    // Cleanup, in both success and fail cases 
    [audio_inputFileUrl release]; 
    [video_inputFileUrl release]; 

    [NSThread sleepForTimeInterval:0.1]; 

    //AVAssetExportSession to export the video 
    AVAssetExportSession* _assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition presetName:AVAssetExportPresetHighestQuality]; 
    _assetExport.outputFileType = AVFileTypeQuickTimeMovie; 
    _assetExport.outputURL = outputFileUrl; 

    [_assetExport exportAsynchronouslyWithCompletionHandler:^(void){ 
     switch (_assetExport.status) { 
      case AVAssetExportSessionStatusCompleted: 
#if !TARGET_IPHONE_SIMULATOR 
       [self writeVideoToPhotoLibrary:outputFileUrl]; 
#endif 
       [self RemoveSlideshowImagesInTemp]; 
       [self removeAudioFileFromDocumentsdirectory:outputFilePath1]; 
       [self removeAudioFileFromDocumentsdirectory:videoOutputPath]; 
       [outputFileUrl release]; 
       [_assetExport release]; 
       //NSLog(@"AVAssetExportSessionStatusCompleted"); 
       dispatch_async(dispatch_get_main_queue(), ^{ 
        if (alrtCreatingVideo && alrtCreatingVideo.visible) { 
         [alrtCreatingVideo dismissWithClickedButtonIndex:alrtCreatingVideo.firstOtherButtonIndex animated:YES]; 
         [databaseObj isVideoCreated:appDelegate.pro_id]; 
         [self performSelector:@selector(successAlertView) withObject:nil afterDelay:0.0]; 
        } 
       }); 
       break; 
      case AVAssetExportSessionStatusFailed: 
       NSLog(@"Failed:%@",_assetExport.error); 
       break; 
      case AVAssetExportSessionStatusCancelled: 
       NSLog(@"Canceled:%@",_assetExport.error); 
       break; 
      default: 
       break; 
     } 
    }]; 
} 

//writeVideoToPhotoLibrary 
- (void)writeVideoToPhotoLibrary:(NSURL *)url 
{ 
    ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init]; 

    [library writeVideoAtPathToSavedPhotosAlbum:url completionBlock:^(NSURL *assetURL, NSError *error){ 
     if (error) { 
      NSLog(@"Video could not be saved"); 
     } 
    }]; 
    [library release]; 
}