@@ -72,6 +72,7 @@ typedef struct {

     int hsub, vsub;             ///< chroma subsampling

     int slice_y;                ///< top of current output slice

     int input_is_pal;           ///< set to 1 if the input format is paletted

+    int output_is_pal;          ///< set to 1 if the output format is paletted

     int interlaced;

     char w_expr[256];           ///< width  expression string

@@ -211,6 +212,8 @@ static int config_props(AVFilterLink *outlink)

     scale->input_is_pal = av_pix_fmt_descriptors[inlink->format].flags & PIX_FMT_PAL ||

                           av_pix_fmt_descriptors[inlink->format].flags & PIX_FMT_PSEUDOPAL;

     if (outfmt == PIX_FMT_PAL8) outfmt = PIX_FMT_BGR8;

+    scale->output_is_pal = av_pix_fmt_descriptors[outfmt].flags & PIX_FMT_PAL ||

+                           av_pix_fmt_descriptors[outfmt].flags & PIX_FMT_PSEUDOPAL;

     if (scale->sws)

         sws_freeContext(scale->sws);

@@ -303,10 +306,10 @@ static int scale_slice(AVFilterLink *link, struct SwsContext *sws, int y, int h,

          in[i] = cur_pic->data[i] + ((y>>vsub)+field) * cur_pic->linesize[i];

         out[i] = out_buf->data[i] +            field  * out_buf->linesize[i];

     }

-    if(scale->input_is_pal){

+    if(scale->input_is_pal)

          in[1] = cur_pic->data[1];

+    if(scale->output_is_pal)

         out[1] = out_buf->data[1];

-    }

     return sws_scale(sws, in, in_stride, y/mul, h,

                          out,out_stride);