@@ -380,7 +380,7 @@ static int config_output(AVFilterLink *outlink)

         if (!s->color_buffer)

             return AVERROR(ENOMEM);

         for (i = 0; i < s->nb_display_channels; i++) {

-            s->color_buffer[i] = av_malloc_array(s->orientation == VERTICAL ? s->h * 3 : s->w * 3, sizeof(**s->color_buffer));

+            s->color_buffer[i] = av_calloc(s->orientation == VERTICAL ? s->h * 3 : s->w * 3, sizeof(**s->color_buffer));

             if (!s->color_buffer[i])

                 return AVERROR(ENOMEM);

         }

@@ -730,8 +730,7 @@ static int plot_spectrum_column(AVFilterLink *inlink, AVFrame *insamples)

     ctx->internal->execute(ctx, plot_channel, NULL, NULL, s->nb_display_channels);

     for (y = 0; y < z * 3; y++) {

-        s->combine_buffer[y] += s->color_buffer[0][y];

-        for (x = 1; x < s->nb_display_channels; x++) {

+        for (x = 0; x < s->nb_display_channels; x++) {

             s->combine_buffer[y] += s->color_buffer[x][y];

         }

     }