@@ -194,6 +194,10 @@ int avfilter_config_links(AVFilterContext *filter)

                 link->time_base = link->src && link->src->input_count ?

                     link->src->inputs[0]->time_base : AV_TIME_BASE_Q;

+            if (link->sample_aspect_ratio.num == 0 && link->sample_aspect_ratio.den == 0)

+                link->sample_aspect_ratio = link->src->input_count ?

+                    link->src->inputs[0]->sample_aspect_ratio : (AVRational){1,1};

+

             if ((config_link = link->dstpad->config_props))

                 if ((ret = config_link(link)) < 0)

                     return ret;

@@ -27,7 +27,7 @@

 #include "libavcore/samplefmt.h"

 #define LIBAVFILTER_VERSION_MAJOR  1

-#define LIBAVFILTER_VERSION_MINOR 75

+#define LIBAVFILTER_VERSION_MINOR 76

 #define LIBAVFILTER_VERSION_MICRO  0

 #define LIBAVFILTER_VERSION_INT AV_VERSION_INT(LIBAVFILTER_VERSION_MAJOR, \

@@ -580,9 +580,10 @@ struct AVFilterLink {

     enum AVMediaType type;      ///< filter media type

-    /* These two parameters apply only to video */

+    /* These parameters apply only to video */

     int w;                      ///< agreed upon image width

     int h;                      ///< agreed upon image height

+    AVRational sample_aspect_ratio; ///< agreed upon sample aspect ratio

     /* These two parameters apply only to audio */

     int64_t channel_layout;     ///< channel layout of current buffer (see libavcore/audioconvert.h)

     int64_t sample_rate;        ///< samples per second

@@ -82,6 +82,9 @@ static int setdar_config_props(AVFilterLink *inlink)

     av_log(inlink->dst, AV_LOG_INFO, "w:%d h:%d -> dar:%d/%d par:%d/%d\n",

            inlink->w, inlink->h, dar.num, dar.den, aspect->aspect.num, aspect->aspect.den);

+

+    inlink->sample_aspect_ratio = aspect->aspect;

+

     return 0;

 }

@@ -108,6 +111,16 @@ AVFilter avfilter_vf_setdar = {

 #endif /* CONFIG_SETDAR_FILTER */

 #if CONFIG_SETSAR_FILTER

+/* for setdar filter, convert from frame aspect ratio to pixel aspect ratio */

+static int setsar_config_props(AVFilterLink *inlink)

+{

+    AspectContext *aspect = inlink->dst->priv;

+

+    inlink->sample_aspect_ratio = aspect->aspect;

+

+    return 0;

+}

+

 AVFilter avfilter_vf_setsar = {

     .name      = "setsar",

     .description = NULL_IF_CONFIG_SMALL("Set the pixel sample aspect ratio."),

@@ -118,6 +131,7 @@ AVFilter avfilter_vf_setsar = {

     .inputs    = (AVFilterPad[]) {{ .name             = "default",

                                     .type             = AVMEDIA_TYPE_VIDEO,

+                                    .config_props     = setsar_config_props,

                                     .get_video_buffer = avfilter_null_get_video_buffer,

                                     .start_frame      = start_frame,

                                     .end_frame        = avfilter_null_end_frame },

@@ -102,6 +102,11 @@ static int config_props_output(AVFilterLink *outlink)

     outlink->w = inlink->h;

     outlink->h = inlink->w;

+    if (inlink->sample_aspect_ratio.num){

+        outlink->sample_aspect_ratio = av_div_q((AVRational){1,1}, inlink->sample_aspect_ratio);

+    } else

+        outlink->sample_aspect_ratio = inlink->sample_aspect_ratio;

+

     av_log(ctx, AV_LOG_INFO, "w:%d h:%d dir:%d -> w:%d h:%d rotation:%s vflip:%d\n",

            inlink->w, inlink->h, trans->dir, outlink->w, outlink->h,

            trans->dir == 1 || trans->dir == 3 ? "clockwise" : "counterclockwise",