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On linux hosts with Nvidia GPU and CUDA support enabled, a CUDA kernel is used to convert captured RGBA frames to NV12 before encoding. This kernel contained a bug affecting image quality, in particular when rendering high-contrast colored text and sharp lines. See [1] for more information. This commit fixes the format conversion kernel by taking 2x2 RGBA blocks to generate 4 luma (Y) values and 1 chroma (UV) pair, ie: 12 bits per pixel YUV420 (NV12). Previous code incorrectly generated 1 UV pair for every 2 pixels. [1] https://github.com/LizardByte/Sunshine/issues/154