avfilter/scale_eval: Reduce rounding error.
When force_original_aspect_ratio and force_divisible_by are both used, dimensions are now rounded to the nearest allowed multiple of force_divisible_by rather than first rounding to the nearest integer and then rounding in a static direction. This results in less distortion of the aspect ratio. Reviewed-by: Thierry Foucu <tfoucu@google.com> Signed-off-by: Tristan Schmelcher <tschmelcher@google.com> Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
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