avfilter/af_aspectralstats: request new frames only when needed

libavfilter/af_aspectralstats.c

@@ -502,6 +502,11 @@ static int activate(AVFilterContext *ctx)
     if (ret < 0)
         return ret;
 
+    if (ff_inlink_queued_samples(inlink) >= s->hop_size) {
+        ff_filter_set_ready(ctx, 10);
+        return 0;
+    }
+
     FF_FILTER_FORWARD_STATUS(inlink, outlink);
     FF_FILTER_FORWARD_WANTED(outlink, inlink);