Fixed extract video filter when requesting black color.

It closes #4695.

Fixed extract video filter when requesting black color.
It closes #4695.
a3628756 · Laurent Aimar · 37f89f65 · a3628756
Commit a3628756 authored Sep 05, 2011 by Laurent Aimar
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Showing with 6 additions and 3 deletions

modules/video_filter/extract.c modules/video_filter/extract.c +6 -3

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--- a/modules/video_filter/extract.c
+++ b/modules/video_filter/extract.c
@@ -291,9 +291,12 @@ static void make_projection_matrix( filter_t *p_filter, int color, int *matrix )
    double green = ((double)(( 0x00FF00 & color )>>8))/255.;
    double blue = ((double)( 0x0000FF & color ))/255.;
    double norm = sqrt( red*red + green*green + blue*blue );
+    if( norm > 0 )
+    {
        red /= norm;
        green /= norm;
        blue /= norm;
+    }
    /* XXX: We might still need to norm the rgb_matrix */
    double rgb_matrix[9] =
        { red*red,    red*green,   red*blue,