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

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  1. POMake movie file with picture Array and song file, using AVAsset
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    <p>I'm trying to make movie file using a picture array and an audio file. To make movie with a picture array i used the big post by zoul <a href="https://stackoverflow.com/questions/3741323/how-do-i-export-uiimage-array-as-a-movie/3742212#3742212">here</a>. All is perfect, I have my movie with my picture. However when I try to add some audio tracks I have lot of problems. To understand I put my code :</p> <p>When I call this method, picture array and song file are ready :</p> <pre><code>-(void) writeImagesToMovieAtPath:(NSString *) path withSize:(CGSize) size { NSString *documentsDirectoryPath = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0]; NSArray *dirContents = [[NSFileManager defaultManager] directoryContentsAtPath:documentsDirectoryPath]; 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:&amp;error]; NSParameterAssert(videoWriter); NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys: AVVideoCodecH264, AVVideoCodecKey, [NSNumber numberWithInt:size.width], AVVideoWidthKey, [NSNumber numberWithInt:size.height], AVVideoHeightKey, nil]; AudioChannelLayout channelLayout; memset(&amp;channelLayout, 0, sizeof(AudioChannelLayout)); channelLayout.mChannelLayoutTag = kAudioChannelLayoutTag_Stereo; NSDictionary *audioSettings = [NSDictionary dictionaryWithObjectsAndKeys: [NSNumber numberWithInt:kAudioFormatMPEG4AAC], AVFormatIDKey, [NSNumber numberWithFloat:44100.0] ,AVSampleRateKey, [NSNumber numberWithInt: 1] ,AVNumberOfChannelsKey, [NSNumber numberWithInt:192000],AVEncoderBitRateKey, [NSData dataWithBytes:&amp;channelLayout length:sizeof(AudioChannelLayout)],AVChannelLayoutKey, nil]; AVAssetWriterInput* videoWriterInput = [[AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:videoSettings] retain]; AVAssetWriterInput* audioWriterInput = [[AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeAudio outputSettings:audioSettings] retain]; NSURL* fileURL = [[NSBundle mainBundle] URLForResource:@"Big_Voice_1" withExtension:@"caf"]; NSLog(@"%@",fileURL); AVAsset *asset = [[AVURLAsset URLAssetWithURL:fileURL options:nil] retain]; AVAssetReader *audioReader = [[AVAssetReader assetReaderWithAsset:asset error:&amp;error] retain]; AVAssetWriterInputPixelBufferAdaptor *adaptor = [AVAssetWriterInputPixelBufferAdaptor assetWriterInputPixelBufferAdaptorWithAssetWriterInput:videoWriterInput sourcePixelBufferAttributes:nil]; AVAssetTrack* audioTrack = [asset.tracks objectAtIndex:0]; AVAssetReaderOutput *readerOutput = [AVAssetReaderTrackOutput assetReaderTrackOutputWithTrack:audioTrack outputSettings:nil]; [audioReader addOutput:readerOutput]; NSParameterAssert(videoWriterInput); NSParameterAssert(audioWriterInput); NSParameterAssert([videoWriter canAddInput:audioWriterInput]); NSParameterAssert([videoWriter canAddInput:videoWriterInput]); audioWriterInput.expectsMediaDataInRealTime = NO; videoWriterInput.expectsMediaDataInRealTime = YES; [videoWriter addInput:audioWriterInput]; [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&lt;20; i++) { buffer = [self pixelBufferFromCGImage:[[m_PictArray objectAtIndex:i] CGImage] andSize:size]; BOOL append_ok = NO; int j = 0; while (!append_ok &amp;&amp; j &lt; 30) { if (adaptor.assetWriterInput.readyForMoreMediaData) { printf("appending %d attemp %d\n", frameCount, j); CMTime frameTime = CMTimeMake(frameCount,(int32_t) 10); //CVPixelBufferPoolCreatePixelBuffer (kCFAllocatorDefault, adaptor.pixelBufferPool, &amp;buffer); 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++; } //Finish the session: [videoWriterInput markAsFinished]; //Start a session: [videoWriter startWriting]; [videoWriter startSessionAtSourceTime:kCMTimeZero]; CVPixelBufferRef buffer = NULL; //Write all picture array in movie file. int frameCount = 0; for(int i = 0; i&lt;[m_PictArray count]; i++) { buffer = [self pixelBufferFromCGImage:[[m_PictArray objectAtIndex:i] CGImage] andSize:size]; BOOL append_ok = NO; int j = 0; while (!append_ok &amp;&amp; j &lt; 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++; } //Finish writing picture: [videoWriterInput markAsFinished]; </code></pre> <p>I finish write picture in movie file and I want copy audio in the file and I do this :</p> <pre><code>[audioReader startReading]; [videoWriter startSessionAtSourceTime:kCMTimeZero]; dispatch_queue_t mediaInputQueue = dispatch_queue_create("mediaInputQueue", NULL); [audioWriterInput requestMediaDataWhenReadyOnQueue:mediaInputQueue usingBlock:^ { NSLog(@"Request"); NSLog(@"Asset Writer ready :%d",audioWriterInput.readyForMoreMediaData); while (audioWriterInput.readyForMoreMediaData) { NSLog(@"Ready"); CMSampleBufferRef nextBuffer = [readerOutput copyNextSampleBuffer]; if (nextBuffer) { NSLog(@"NextBuffer"); [audioWriterInput appendSampleBuffer:nextBuffer]; } } } ]; [audioWriterInput markAsFinished]; [videoWriter finishWriting]; </code></pre> <p>However the status of AssetWriterInput of audio file is always "NO".</p> <p>My question : How to add audio to a video file using AVFoundation?</p> <p>So please can someone help me by telling me if I forget something or if something is wrong.</p> <p>Thank you very much </p>
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