@@ -60,12 +60,17 @@ static int query_formats(AVFilterContext *ctx)

     return 0;

 }

+#define SET_META(key, value) \

+    snprintf(buf, sizeof(buf), "%d", value);  \

+    av_dict_set(metadata, #key, buf, 0); \

+

 static int filter_frame(AVFilterLink *inlink, AVFrame *frame)

 {

     AVFilterContext *ctx = inlink->dst;

     BBoxContext *bbox = ctx->priv;

     FFBoundingBox box;

     int has_bbox, w, h;

+    char buf[32];

     has_bbox =

         ff_calculate_bounding_box(&box,

@@ -79,6 +84,15 @@ static int filter_frame(AVFilterLink *inlink, AVFrame *frame)

            av_ts2str(frame->pts), av_ts2timestr(frame->pts, &inlink->time_base));

     if (has_bbox) {

+        AVDictionary **metadata = avpriv_frame_get_metadatap(frame);

+

+        SET_META("lavfi.bbox.x1", box.x1)

+        SET_META("lavfi.bbox.x2", box.x2)

+        SET_META("lavfi.bbox.y1", box.y1)

+        SET_META("lavfi.bbox.y2", box.y2)

+        SET_META("lavfi.bbox.w",  w)

+        SET_META("lavfi.bbox.h",  h)

+

         av_log(ctx, AV_LOG_INFO,

                " x1:%d x2:%d y1:%d y2:%d w:%d h:%d"

                " crop=%d:%d:%d:%d drawbox=%d:%d:%d:%d",