avfilter/video: pick sar from link

It should not be needed for each filter that sets sample aspect ratio
to set it explicitly also for each and every frame, instead that is
automatically done in get_buffer call.

Signed-off-by: Paul B Mahol <onemda@gmail.com>

diff --git a/libavfilter/video.c b/libavfilter/video.c
index 6f9020b9fe0e29acb3fa4d1fe46e5a6242b0b8fd..7a8e587798839b2b252ab60436d90cff10d8b1aa 100644 (file)
--- a/libavfilter/video.c
+++ b/libavfilter/video.c
@@ -43,6 +43,7 @@ AVFrame *ff_null_get_video_buffer(AVFilterLink *link, int w, int h)
 
 AVFrame *ff_default_get_video_buffer(AVFilterLink *link, int w, int h)
 {
+    AVFrame *frame = NULL;
     int pool_width = 0;
     int pool_height = 0;
     int pool_align = 0;
@@ -86,7 +87,13 @@ AVFrame *ff_default_get_video_buffer(AVFilterLink *link, int w, int h)
         }
     }
 
-    return ff_frame_pool_get(link->frame_pool);
+    frame = ff_frame_pool_get(link->frame_pool);
+    if (!frame)
+        return NULL;
+
+    frame->sample_aspect_ratio = link->sample_aspect_ratio;
+
+    return frame;
 }
 
 AVFrame *ff_get_video_buffer(AVFilterLink *link, int w, int h)