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I’d like to convert a CGImage to CMSampleBufferRef and append it to a AVAssetWriterInput using the appendSampleBuffer: method. I’ve managed to get the CMSampleBufferRef using the following code, but the appendSampleBuffer: simply returns NO when I supply the resulting CMSampleBufferRef . What am I doing wrong? - (void) appendCGImage: (CGImageRef) frame { const int width = CGImageGetWidth(frame); const int height = CGImageGetHeight(frame); // Create a dummy pixel buffer to try the encoding // on something simple. CVPixelBufferRef pixelBuffer = NULL; CVReturn status = CVPixelBufferCreate(kCFAllocatorDefault, width, height, kCVPixelFormatType_32BGRA, NULL, &pixelBuffer); NSParameterAssert(status == kCVReturnSuccess && pixelBuffer != NULL); // Sample timing info. CMTime frameTime = CMTimeMake(1, 30); CMTime currentTime = CMTimeAdd(lastSampleTime, frameTime); CMSampleTimingInfo timing = {frameTime, currentTime, kCMTimeInvalid}; OSStatus result = 0; // Sample format. CMVideoFormatDescriptionRef videoInfo = NULL; result = CMVideoFormatDescriptionCreateForImageBuffer(NULL, pixelBuffer, &videoInfo); NSParameterAssert(result == 0 && videoInfo != NULL); // Create sample buffer. CMSampleBufferRef sampleBuffer = NULL; result = CMSampleBufferCreateForImageBuffer(kCFAllocatorDefault, pixelBuffer, true, NULL, NULL, videoInfo, &timing, &sampleBuffer); NSParameterAssert(result == 0 && sampleBuffer != NULL); // Ship out the frame. NSParameterAssert(CMSampleBufferDataIsReady(sampleBuffer)); NSParameterAssert([writerInput isReadyForMoreMediaData]); BOOL success = [writerInput appendSampleBuffer:frame]; NSParameterAssert(success); // no go :( } P.S. I know there are memory leaks in

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