如何從圖像添加聲音到創建的視頻

Question

這是我用於創建視頻圖像的代碼，但我需要將聲音軌道還原到視頻中。任何幫助都將被appriciated。

- (IBAction)saveMovieToLibrary 
{ 
    ImageVideoPath = [NSHomeDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:@"Documents/movie.mp4"]]; 

    NSLog(@"<><><><>=%@",ImageVideoPath); 


    testImageArray = [[NSArray alloc] initWithObjects: 
         [UIImage imageNamed:@"image1.png"], 
         [UIImage imageNamed:@"image2.png"], 
         [UIImage imageNamed:@"image3.png"], 
         [UIImage imageNamed:@"image4.png"], 
         [UIImage imageNamed:@"image5.png"], 
         [UIImage imageNamed:@"image6.png"], 
         [UIImage imageNamed:@"image7.png"], 
         [UIImage imageNamed:@"image9.png"], 
         [UIImage imageNamed:@"image10.png"], 
         [UIImage imageNamed:@"image11.png"], 
         [UIImage imageNamed:@"image12.png"], nil]; 


    // NSLog(@"testImageArray/=%@",testImageArray); 


    [self writeImageAsMovie:testImageArray toPath:ImageVideoPath size:CGSizeMake(480, 320) duration:1]; 
} 

-(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:AVFileTypeMPEG4 
                   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]; 

    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; 
    buffer = [self pixelBufferFromCGImage:[[array objectAtIndex:0] CGImage] size:CGSizeMake(480, 320)]; 
    CVPixelBufferPoolCreatePixelBuffer (NULL, adaptor.pixelBufferPool, &buffer); 


    [adaptor appendPixelBuffer:buffer withPresentationTime:kCMTimeZero]; 


    int i = 1; 
    while (1) 
    { 
     if(writerInput.readyForMoreMediaData){ 

      CMTime frameTime = CMTimeMake(0, 12); 
      CMTime lastTime=CMTimeMake(i, 2); 
      CMTime presentTime=CMTimeAdd(lastTime, frameTime); 

      if (i >= [array count]) 
      { 
       buffer = NULL; 
      } 
      else 
      { 
       buffer = [self pixelBufferFromCGImage:[[array objectAtIndex:i] CGImage] size:CGSizeMake(480, 320)]; 
      }   


      if (buffer) 
      { 
       // append buffer 
       [adaptor appendPixelBuffer:buffer withPresentationTime:presentTime]; 
       i++; 
      } 
      else 
      { 

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

       CVPixelBufferPoolRelease(adaptor.pixelBufferPool); 


       [videoWriter release]; 
       [writerInput release]; 
       NSLog (@"Done"); 
       break; 
      } 
     } 
    } 

    audioFilePath1=[[NSBundle mainBundle]pathForResource:@"Video" ofType:@"mp3"]; 

    NSLog(@"%@",audioFilePath1); 
    NSLog(@"Video File Path=%@",ImageVideoPath); 

    [self addAudioToFileAtPath:ImageVideoPath andAudioPath:audioFilePath1]; 
} 


- (CVPixelBufferRef) pixelBufferFromCGImage: (CGImageRef) image size:(CGSize) size{ 

    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, (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, size.width, 
               size.height, 8, 4*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; 
} 

Answer 1

使用此代碼：

AVURLAsset* audioAsset = [[AVURLAsset alloc]initWithURL:audioUrl options:nil]; 
AVURLAsset* videoAsset = [[AVURLAsset alloc]initWithURL:videoUrl options:nil]; 

AVMutableComposition* mixComposition = [AVMutableComposition composition]; 

AVMutableCompositionTrack *compositionCommentaryTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio 
                      preferredTrackID:kCMPersistentTrackID_Invalid]; 
[compositionCommentaryTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, audioAsset.duration) 
           ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] 
           atTime:kCMTimeZero error:nil]; 

AVMutableCompositionTrack *compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo 
                       preferredTrackID:kCMPersistentTrackID_Invalid]; 
[compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, videoAsset.duration) 
          ofTrack:[[videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] 
          atTime:kCMTimeZero error:nil]; 

AVAssetExportSession* _assetExport = [[AVAssetExportSession alloc] initWithAsset:mixComposition 
                   presetName:AVAssetExportPresetPassthrough]; 

NSString* videoName = @"export.mov"; 

NSString *exportPath = [NSTemporaryDirectory() stringByAppendingPathComponent:videoName]; 
NSURL *exportUrl = [NSURL fileURLWithPath:exportPath]; //url of your video created from image 

if ([[NSFileManager defaultManager] fileExistsAtPath:exportPath]) 
{ 
    [[NSFileManager defaultManager] removeItemAtPath:exportPath error:nil]; 
} 

_assetExport.outputFileType = @"com.apple.quicktime-movie"; 
DLog(@"file type %@",_assetExport.outputFileType); 
_assetExport.outputURL = exportUrl; 
_assetExport.shouldOptimizeForNetworkUse = YES; 

[_assetExport exportAsynchronouslyWithCompletionHandler: 
^(void) {  
     // your completion code here 
}  
} 
]; 

希望對大家有用。

Answer 2

代碼是在這裏...

 
 

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];
 

AVMutableCompositionTrack *b_compositionAudioTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeAudio
 

here the code.
 

preferredTrackID:kCMPersistentTrackID_Invalid]; [b_compositionAudioTrack insertTimeRange:audio_timeRange ofTrack:[[audioAsset tracksWithMediaType:AVMediaTypeAudio] objectAtIndex:0] atTime:nextClipStartTime error:nil];
 

__block AVAssetExportSession* _assetExport = [[AVAssetExportSession alloc] initWithAsset:[videoComposition copy] presetName:AVAssetExportPresetMediumQuality];
 

_assetExport.videoComposition = videoComposition; _assetExport.outputFileType = AVFileTypeQuickTimeMovie; _assetExport.outputURL = outputFileUrl; [_assetExport exportAsynchronouslyWithCompletionHandler:^{ switch (_assetExport.status) { case AVAssetExportSessionStatusCompleted: // Custom method to import the Exported Video NSLog(@"completed video creation!!!"); [self removeAudioFileFromDocumentsdirectory:outputFilePath1]; [self removeAudioFileFromDocumentsdirectory:videoOutputPath]; break; case AVAssetExportSessionStatusFailed: // NSLog(@"Failed video creation:%@",_assetExport.error); break; case AVAssetExportSessionStatusCancelled: // NSLog(@"Canceled:%@",_assetExport.error); break; default: break; } }];