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    <p>I had the same problem, and I think it is possibly because you have not configured your <code>AVAssetWriterInput</code> correctly. My pool started working after I had done this. In particular, the pool would not give me pixel buffers unless I had provided data in <code>AVVideoCompressionPropertiesKey</code>. First, create and fully configure the <code>AVAssetWriter</code> ( Look in <code>/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk/System/Library/Frameworks/AVFoundation.framework/Headers/AVVideoSettings.h</code> for keys &amp; values for <code>outputSettings</code> and <code>compressionSettings</code>):</p> <pre><code>NSError * err = 0; AVAssetWriter * outputWriter = [AVAssetWriter assetWriterWithURL: [NSURL fileURLWithPath:outputPath] fileType: AVFileTypeAppleM4V error: &amp; err]; NSMutableDictionary * outputSettings = [[NSMutableDictionary alloc] init]; [outputSettings setObject: AVVideoCodecH264 forKey: AVVideoCodecKey]; [outputSettings setObject: [NSNumber numberWithInt: width_] forKey: AVVideoWidthKey]; [outputSettings setObject: [NSNumber numberWithInt: height_] forKey: AVVideoHeightKey]; NSMutableDictionary * compressionProperties = [[NSMutableDictionary alloc] init]; [compressionProperties setObject: [NSNumber numberWithInt: 1000000] forKey: AVVideoAverageBitRateKey]; [compressionProperties setObject: [NSNumber numberWithInt: 16] forKey: AVVideoMaxKeyFrameIntervalKey]; [compressionProperties setObject: AVVideoProfileLevelH264Main31 forKey: AVVideoProfileLevelKey]; [outputSettings setObject: compressionProperties forKey: AVVideoCompressionPropertiesKey]; AVAssetWriterInput * writerInput = [AVAssetWriterInput assetWriterInputWithMediaType: AVMediaTypeVideo outputSettings: outputSettings]; [compressionProperties release]; [outputSettings release]; </code></pre> <p>Create the pixel buffer adaptor:</p> <pre><code>NSMutableDictionary * pixBufSettings = [[NSMutableDictionary alloc] init]; [pixBufSettings setObject: [NSNumber numberWithInt: kCVPixelFormatType_32BGRA] forKey: (NSString *) kCVPixelBufferPixelFormatTypeKey]; [pixBufSettings setObject: [NSNumber numberWithInt: width_] forKey: (NSString *) kCVPixelBufferWidthKey]; [pixBufSettings setObject: [NSNumber numberWithInt: height_] forKey: (NSString *) kCVPixelBufferHeightKey]; AVAssetWriterInputPixelBufferAdaptor * outputPBA = [AVAssetWriterInputPixelBufferAdaptor assetWriterInputPixelBufferAdaptorWithAssetWriterInput: outputInput sourcePixelBufferAttributes: nil]; </code></pre> <p>Then retrieve pixel buffers from its pool using:</p> <pre><code>CVReturn res = CVPixelBufferPoolCreatePixelBuffer (NULL , [outputPBA pixelBufferPool] , &amp; outputFrame); </code></pre>
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    1. POAVAssetWriterInputPixelBufferAdaptor returns null pixel buffer pool
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    1. USWilliam Gallafent
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      1. VTUpMod
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    1. COyou didn't use pixBufSettings
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      1. USOr Arbel
 

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