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    <p>Here is how I do it on iOS in my captureOutput after I get a raw video frame from AVCaptureSession(kCVPixelFormatType_420YpCbCr8BiPlanarFullRange):</p> <pre><code>- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection { CVImageBufferRef videoFrame = CMSampleBufferGetImageBuffer(sampleBuffer); CFRetain(sampleBuffer); CVPixelBufferLockBaseAddress(videoFrame, 0); size_t _width = CVPixelBufferGetWidth(videoFrame); size_t _height = CVPixelBufferGetHeight(videoFrame); const uint8* plane1 = (uint8*)CVPixelBufferGetBaseAddressOfPlane(videoFrame,0); const uint8* plane2 = (uint8*)CVPixelBufferGetBaseAddressOfPlane(videoFrame,1); size_t plane1_stride = CVPixelBufferGetBytesPerRowOfPlane (videoFrame, 0); size_t plane2_stride = CVPixelBufferGetBytesPerRowOfPlane (videoFrame, 1); size_t plane1_size = plane1_stride * CVPixelBufferGetHeightOfPlane(videoFrame, 0); size_t plane2_size = CVPixelBufferGetBytesPerRowOfPlane (videoFrame, 1) * CVPixelBufferGetHeightOfPlane(videoFrame, 1); size_t frame_size = plane1_size + plane2_size; uint8* buffer = new uint8[ frame_size ]; uint8* dst_u = buffer + plane1_size; uint8* dst_v = dst_u + plane1_size/4; // Let libyuv convert libyuv::NV12ToI420(/*const uint8* src_y=*/plane1, /*int src_stride_y=*/plane1_stride, /*const uint8* src_uv=*/plane2, /*int src_stride_uv=*/plane2_stride, /*uint8* dst_y=*/buffer, /*int dst_stride_y=*/plane1_stride, /*uint8* dst_u=*/dst_u, /*int dst_stride_u=*/plane2_stride/2, /*uint8* dst_v=*/dst_v, /*int dst_stride_v=*/plane2_stride/2, _width, _height); CVPixelBufferUnlockBaseAddress(videoFrame, 0); CFRelease( sampleBuffer) // TODO: call your method here with 'buffer' variable. note that you need to deallocated the buffer after using it } </code></pre> <p>I made the code a bit more descriptive for clarity.</p>
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    1. POHow to convert a kCVPixelFormatType_420YpCbCr8BiPlanarFullRange Buffer to YUV420 using libyuv library in ios?
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    1. USAki
    1. USAki
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    1. CONo need to retain and release sampleBuffer just lock and unlock after use
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    2. CO`buffer` is leaked
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      1. USuser102008
    3. COi tweaked the code, so it is clear that the buffer needs to be deallocated after it is used
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      1. USAki
 

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