swscale: pass/calculate sar-info, should fix #7437

(cherry picked from commit 0f233f4980d0440b8357de629fee7fa0741c27b3)

modules/video_filter/croppadd.c

@@ -190,6 +190,9 @@ static int OpenFilter( vlc_object_t *p_this )
              p_filter->fmt_out.video.i_width,
              p_filter->fmt_out.video.i_height );
 
+    p_filter->fmt_out.video.i_sar_num = p_filter->fmt_in.video.i_sar_num * p_filter->fmt_out.video.i_visible_height;
+    p_filter->fmt_out.video.i_sar_den = p_filter->fmt_in.video.i_sar_den * p_filter->fmt_out.video.i_visible_width;
+
     return VLC_SUCCESS;
 }
 

modules/video_filter/swscale.c

@@ -208,6 +208,9 @@ static int OpenScaler( vlc_object_t *p_this )
              (char *)&p_filter->fmt_out.video.i_chroma,
              ppsz_mode_descriptions[i_sws_mode] );
 
+    p_filter->fmt_out.video.i_sar_num = p_filter->fmt_in.video.i_sar_num;
+    p_filter->fmt_out.video.i_sar_den = p_filter->fmt_in.video.i_sar_den;
+
     return VLC_SUCCESS;
 }