@@ -657,7 +657,7 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *in)

                   (const uint8_t**)in->data, in->linesize,

                   inlink->format, inlink->w, inlink->h);

-    p = !!in->interlaced_frame;

+    p = in->interlaced_frame ? !in->top_field_first : 0;

     pullup_submit_field(s, b, p  );

     pullup_submit_field(s, b, p^1);