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Encoders sometimes produce sample aspect ratios like 3201:3200 (0.03% off square) for content that has effectively square pixels. The exact string comparison against "1:1" marks these as anamorphic, which triggers unnecessary transcoding on clients that require non-anamorphic video. Parse the SAR ratio numerically and treat values within 1% of 1:1 as square pixels. This threshold is well clear of the nearest real anamorphic SAR (PAL 4:3 at 16:15 = 6.67% off).