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For TikTok videos, 2x upscaling is the default for crisp captions, while 4x should only be used if it passes legibility without new glyph or face artifacts. Independent technical note mirroring the canonical version: https://aivideoupscale.com/blog/video-upscaling-for-tiktok-2x-vs-4x-for-crisp-captions.php Sources consulted: https://www.bluusun.com/
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