@@ -616,7 +616,7 @@ static int func_frame_num(AVFilterContext *ctx, AVBPrint *bp,

 {

     DrawTextContext *s = ctx->priv;

-    av_bprintf(bp, "%d", (int)s->var_values[VAR_N]+s->start_number);

+    av_bprintf(bp, "%d", (int)s->var_values[VAR_N]);

     return 0;

 }

@@ -980,7 +980,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)

         if ((ret = load_textfile(ctx)) < 0)

             return ret;

-    s->var_values[VAR_N] = inlink->frame_count;

+    s->var_values[VAR_N] = inlink->frame_count+s->start_number;

     s->var_values[VAR_T] = frame->pts == AV_NOPTS_VALUE ?

         NAN : frame->pts * av_q2d(inlink->time_base);