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    <h1>Stream Encoding Video</h1> <h2>Approaches</h2> <p>I'm working on a similar problem and I'll share what I've learned. While I don't know how to stream them out, I do know how to generate and encode multiple HD video streams on the server. I've tested two approaches: NVIDIA <a href="http://developer.nvidia.com/cuda-cc-sdk-code-samples#cudaEncode" rel="nofollow">CUDA Video Encode (C Library) API</a> and In<a href="http://software.intel.com/en-us/articles/intel-integrated-performance-primitives-code-samples/" rel="nofollow">tel Performance Primitives Video Encoder</a>. The NVIDIA link takes you right to the example. The Intel page does not have internal anchors so you'll have to search for "Video Encoder". </p> <h2>Test Setup</h2> <p>Both encode video streams, up to and inlcluding HD, to H.264. Other formats are supported, but I am interested in H.264. To test performance, I setup prepared input video, in YUV format, and fed it to the encoders as fast as they would take it. Output from both encoders was 1080P. </p> <h2>CPU Performance</h2> <p>Performance wise, the Intel video encoder could encode a single stream at 0.5X real time with about a 12.5% load on a Xeon E5520 @ 2.27GHz, i.e. one core of eight at 100% load. Newer Xeons are much faster, but I don't know if they can hit real-time yet. </p> <h2>GPU Performance</h2> <p>The NVIDIA encoder on a GTS 450, could encode 9-10X real-time 1080P(!) with a 50% CPU load. The CPU load on the NVIDIA appear to be primarily copying data to-and-from the GPU. </p> <p>What is particularly nice about the GPU solution is that it can take a GPU render surface as input; graphics are generated and encoded on the GPU, only leaving to go out to the network. For details on using a render surface and an input, see <a href="http://rads.stackoverflow.com/amzn/click/0131387685" rel="nofollow">CUDA by Example</a>, an excellent and straight-forward book on GPU programming. In that case I would expect CPU load to drop by approximately half. Since there is no point in going faster than real-time for real-time graphics, you could likely encode 8+ streams from render surfaces with adequate GPU resources, e.g. two GTS 450 cards, perhaps many more if resolution lower than 1080P is acceptable. </p>
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    1. POUsing 3D engine output as input to streaming video
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    1. USJeff Benshetler
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      1. VTUpMod
    1. COFascinating stuff, thanks.
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      1. USMr. Boy
 

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