Re-Encoding Before Upscaling Often Wastes Quality, Measurements Show

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A DEV Community author tested whether transcoding compressed video to a lossless format before upscaling improves results, as many tutorials recommend. Using a downscaled test frame with a full-resolution original as ground truth, the author scored each pipeline with PSNR, SSIM, and a blockiness index. A lossless round trip produced results identical to skipping it, so it adds a step without changing the output. When bitrate was matched per pixel, encoding after upscaling outperformed encoding before by 0.6 to 1.4 dB. The author attributes this to the upscaler amplifying codec errors that were introduced during pre-encoding.

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