For true enthusiasts, a physical disc offers uncompressed audio and superior video bitrates compared to any internet download. While a native, standalone 4K UHD Blu-ray disc release of The Secret Life of Walter Mitty has seen limited regional availability over the years, many collectors utilize premium 4K upscaling Blu-ray players. These devices take the highly detailed standard Blu-ray print and upscale it to 2160p resolution seamlessly. Technical Requirements for True 4K Playback