visual: output pictures are progressive

Fix #19561

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

modules/visualization/visual/visual.c

@@ -340,6 +340,7 @@ static block_t *DoRealWork( filter_t *p_filter, block_t *p_in_buf )
 
     /* First, get a new picture */
     picture_t *p_outpic = vout_GetPicture( p_sys->p_vout );
+    p_outpic->b_progressive = true;
     if( unlikely(p_outpic == NULL) )
         return p_in_buf;