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cmdutils: Fix sign error in display matrix auto-rotation code
This makes the sample from Ticket4560 behave consistently with either branch Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
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@ -2101,7 +2101,7 @@ double get_rotation(AVStream *st)
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theta = 0;
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}
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if (displaymatrix && !theta)
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theta = av_display_rotation_get((int32_t*) displaymatrix);
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theta = -av_display_rotation_get((int32_t*) displaymatrix);
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theta -= 360*floor(theta/360 + 0.9/360);
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