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POhow to use AVAssetWriter to write h264 strem into video?
 

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    <p>I want to make the h.264 stream from server to a video file, but when I used <code>assetwrite.finishwrite</code>, the XCode reports</p> <pre><code>Video /var/mobile/Applications/DE4196F1-BB77-4B7D-8C20-7A5D6223C64D/Documents/test.mov cannot be saved to the saved photos album: Error Domain=NSOSStatusErrorDomain Code=-12847 "This movie format is not supported." UserInfo=0x5334830 {NSLocalizedDescription=This movie format is not supported.}" </code></pre> <p>Below is my code: data is the h.264 frame, just one frame, it might be i frame or p.</p> <pre><code>(void)_encodeVideoFrame2:(NSData *) data time:(double)tm { CMBlockBufferRef videoBlockBuffer=NULL; CMFormatDescriptionRef videoFormat=NULL; CMSampleBufferRef videoSampleBuffer=NULL; CMItemCount numberOfSampleTimeEntries=1; CMItemCount numberOfSamples=1; CMVideoFormatDescriptionCreate(kCFAllocatorDefault, kCMVideoCodecType_H264, 320, 240, NULL, &amp;videoFormat); OSStatus result; result=CMBlockBufferCreateWithMemoryBlock(kCFAllocatorDefault, NULL, data.length, kCFAllocatorDefault, NULL, 0, data.length, kCMBlockBufferAssureMemoryNowFlag, &amp;videoBlockBuffer); result=CMBlockBufferReplaceDataBytes(data.bytes, videoBlockBuffer, 0, data.length); CMSampleTimingInfo videoSampleTimingInformation={CMTimeMake(tm*600, 600)}; size_t sampleSizeArray[1]; sampleSizeArray[0]=data.length; result=CMSampleBufferCreate(kCFAllocatorDefault, videoBlockBuffer, TRUE, NULL, NULL, videoFormat, numberOfSamples, numberOfSampleTimeEntries, &amp;videoSampleTimingInformation, 1, sampleSizeArray, &amp;videoSampleBuffer); result = CMSampleBufferMakeDataReady(videoSampleBuffer); [assetWriterInput appendSampleBuffer:videoSampleBuffer]; } </code></pre> <p>maybe the <code>CMSampleBufferCreate</code> arguments are wrong？ Thank you.</p>
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