diff --git a/libavformat/mov.c b/libavformat/mov.c
index 09d55da624..5173e393b1 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -2321,12 +2321,10 @@ FF_ENABLE_DEPRECATION_WARNINGS
             if (tmcd_ctx->tmcd_flags & 0x0008) {
                 int timescale = AV_RB32(st->codecpar->extradata + 8);
                 int framedur = AV_RB32(st->codecpar->extradata + 12);
-                st->avg_frame_rate.num *= timescale;
-                st->avg_frame_rate.den *= framedur;
+                st->avg_frame_rate = av_mul_q(st->avg_frame_rate, (AVRational){timescale, framedur});
 #if FF_API_LAVF_AVCTX
 FF_DISABLE_DEPRECATION_WARNINGS
-                st->codec->time_base.den *= timescale;
-                st->codec->time_base.num *= framedur;
+                st->codec->time_base = av_mul_q(st->codec->time_base , (AVRational){framedur, timescale});
 FF_ENABLE_DEPRECATION_WARNINGS
 #endif
             }