diff --git a/libavfilter/vf_estdif.c b/libavfilter/vf_estdif.c
index 9dda604d3c..192837ab0f 100644
--- a/libavfilter/vf_estdif.c
+++ b/libavfilter/vf_estdif.c
@@ -140,10 +140,8 @@ static int config_output(AVFilterLink *outlink)
     AVFilterContext *ctx = outlink->src;
     AVFilterLink *inlink = ctx->inputs[0];
 
-    outlink->time_base.num = inlink->time_base.num;
-    outlink->time_base.den = inlink->time_base.den * 2;
-    outlink->frame_rate.num = inlink->frame_rate.num * 2;
-    outlink->frame_rate.den = inlink->frame_rate.den;
+    outlink->time_base = av_mul_q(inlink->time_base, (AVRational){1, 2});
+    outlink->frame_rate = av_mul_q(inlink->frame_rate, (AVRational){2, 1});
 
     return 0;
 }