diff --git a/doc/filters.texi b/doc/filters.texi
index 8054bffb1d..2e419a8edf 100644
--- a/doc/filters.texi
+++ b/doc/filters.texi
@@ -1184,12 +1184,15 @@ same as @var{out_w} and @var{out_h}
 x and y offsets as specified by the @var{x} and @var{y}
 expressions, or NAN if not yet specified
 
-@item dar, a
-input display aspect ratio, same as @var{iw} / @var{ih}
+@item a
+same as @var{iw} / @var{ih}
 
 @item sar
 input sample aspect ratio
 
+@item dar
+input display aspect ratio, it is the same as (@var{iw} / @var{ih}) * @var{sar}
+
 @item hsub, vsub
 horizontal and vertical chroma subsample values. For example for the
 pixel format "yuv422p" @var{hsub} is 2 and @var{vsub} is 1.
@@ -1289,12 +1292,15 @@ the output (cropped) width and heigth
 @item ow, oh
 same as @var{out_w} and @var{out_h}
 
-@item dar, a
-input display aspect ratio, same as @var{iw} / @var{ih}
+@item a
+same as @var{iw} / @var{ih}
 
 @item sar
 input sample aspect ratio
 
+@item dar
+input display aspect ratio, it is the same as (@var{iw} / @var{ih}) * @var{sar}
+
 @item hsub, vsub
 horizontal and vertical chroma subsample values. For example for the
 pixel format "yuv422p" @var{hsub} is 2 and @var{vsub} is 1.
diff --git a/libavfilter/avfilter.h b/libavfilter/avfilter.h
index 913a52b22f..6746176c0d 100644
--- a/libavfilter/avfilter.h
+++ b/libavfilter/avfilter.h
@@ -30,7 +30,7 @@
 
 #define LIBAVFILTER_VERSION_MAJOR  2
 #define LIBAVFILTER_VERSION_MINOR 27
-#define LIBAVFILTER_VERSION_MICRO  3
+#define LIBAVFILTER_VERSION_MICRO  4
 
 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \
                                                LIBAVFILTER_VERSION_MINOR, \
diff --git a/libavfilter/vf_pad.c b/libavfilter/vf_pad.c
index e01a750d94..c4edc23cc5 100644
--- a/libavfilter/vf_pad.c
+++ b/libavfilter/vf_pad.c
@@ -45,8 +45,9 @@ static const char *var_names[] = {
     "out_h",  "oh",
     "x",
     "y",
-    "a", "dar",
+    "a",
     "sar",
+    "dar",
     "hsub",
     "vsub",
     NULL
@@ -62,8 +63,9 @@ enum var_name {
     VAR_OUT_H,  VAR_OH,
     VAR_X,
     VAR_Y,
-    VAR_A, VAR_DAR,
+    VAR_A,
     VAR_SAR,
+    VAR_DAR,
     VAR_HSUB,
     VAR_VSUB,
     VARS_NB
@@ -158,9 +160,10 @@ static int config_input(AVFilterLink *inlink)
     var_values[VAR_IN_H]  = var_values[VAR_IH] = inlink->h;
     var_values[VAR_OUT_W] = var_values[VAR_OW] = NAN;
     var_values[VAR_OUT_H] = var_values[VAR_OH] = NAN;
-    var_values[VAR_DAR]   = var_values[VAR_A] = (float) inlink->w / inlink->h;
+    var_values[VAR_A]     = (float) inlink->w / inlink->h;
     var_values[VAR_SAR]   = inlink->sample_aspect_ratio.num ?
         (float) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
+    var_values[VAR_DAR]   = var_values[VAR_A] * var_values[VAR_SAR];
     var_values[VAR_HSUB]  = 1<<pad->hsub;
     var_values[VAR_VSUB]  = 1<<pad->vsub;
 
diff --git a/libavfilter/vf_scale.c b/libavfilter/vf_scale.c
index 3be5d99e96..044b2843bc 100644
--- a/libavfilter/vf_scale.c
+++ b/libavfilter/vf_scale.c
@@ -39,8 +39,9 @@ static const char *var_names[] = {
     "in_h",   "ih",
     "out_w",  "ow",
     "out_h",  "oh",
-    "a", "dar",
+    "a",
     "sar",
+    "dar",
     "hsub",
     "vsub",
     NULL
@@ -54,8 +55,9 @@ enum var_name {
     VAR_IN_H,   VAR_IH,
     VAR_OUT_W,  VAR_OW,
     VAR_OUT_H,  VAR_OH,
-    VAR_A, VAR_DAR,
+    VAR_A,
     VAR_SAR,
+    VAR_DAR,
     VAR_HSUB,
     VAR_VSUB,
     VARS_NB
@@ -160,9 +162,10 @@ static int config_props(AVFilterLink *outlink)
     var_values[VAR_IN_H]  = var_values[VAR_IH] = inlink->h;
     var_values[VAR_OUT_W] = var_values[VAR_OW] = NAN;
     var_values[VAR_OUT_H] = var_values[VAR_OH] = NAN;
-    var_values[VAR_DAR]   = var_values[VAR_A]  = (float) inlink->w / inlink->h;
+    var_values[VAR_A]     = (float) inlink->w / inlink->h;
     var_values[VAR_SAR]   = inlink->sample_aspect_ratio.num ?
         (float) inlink->sample_aspect_ratio.num / inlink->sample_aspect_ratio.den : 1;
+    var_values[VAR_DAR]   = var_values[VAR_A] * var_values[VAR_SAR];
     var_values[VAR_HSUB]  = 1<<av_pix_fmt_descriptors[inlink->format].log2_chroma_w;
     var_values[VAR_VSUB]  = 1<<av_pix_fmt_descriptors[inlink->format].log2_chroma_h;