[FFmpeg-devel] [PATCH] Fix vf_cropdetect returning negative rectangles

[hjiodjf 97xgw46]

The cropdetect filter is prone to reporting negative-sized rectangles,
particularly for dark images. This patch adjusts the limits of the
filter loops, preventing the left/right and top/bottom offsets from
crossing each other, so that such a zero-sized rectangle is reported
instead of a negative one. This improves the reliability of using
cropdetect to find a maximum bounding rectangle.
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