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vf_drawtext: select YUV color for drawbox() in case YUV colorspace is used
Fix box alpha rendering when a YUV colorspace is selected, in particular fix trac ticket #763.
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@ -825,7 +825,7 @@ static int draw_text(AVFilterContext *ctx, AVFilterBufferRef *picref,
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/* draw box */
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if (dtext->draw_box)
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drawbox(picref, dtext->x, dtext->y, box_w, box_h,
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dtext->box_line, dtext->pixel_step, dtext->boxcolor_rgba,
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dtext->box_line, dtext->pixel_step, dtext->is_packed_rgb ? dtext->boxcolor_rgba : dtext->boxcolor,
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dtext->hsub, dtext->vsub, dtext->is_packed_rgb, dtext->rgba_map);
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if (dtext->shadowx || dtext->shadowy) {
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