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Automatically selects the best available\nbackend: GPU hardware acceleration via 'Vulkan'\n'VK_KHR_VIDEO_ENCODE_AV1' or 'VAAPI' (tested on AMD RDNA4;\nbundled headers, builds with any 'Vulkan' SDK >= 1.3.275), with\nautomatic fallback to CPU encoding through 'FFmpeg' and\n'SVT-AV1'. User controls quality via a single CRF parameter;\neach backend adapts automatically (CPU and Vulkan use CRF\ndirectly, VAAPI targets 55 percent of input bitrate). TIFF\nstacks use near-lossless CRF 5 by default, with optional\nproportional scaling via tiff_scale (multiplier or bounding\nbox, aspect ratio always preserved). Small frames are\nautomatically scaled up to meet hardware encoder minimums.\nAudio tracks are preserved automatically. 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