@@ -3943,8 +3943,8 @@ FF_ENABLE_DEPRECATION_WARNINGS

             if (!st->r_frame_rate.num) {

                 if (    avctx->time_base.den * (int64_t) st->time_base.num

                     <= avctx->time_base.num * avctx->ticks_per_frame * (int64_t) st->time_base.den) {

-                    st->r_frame_rate.num = avctx->time_base.den;

-                    st->r_frame_rate.den = avctx->time_base.num * avctx->ticks_per_frame;

+                    av_reduce(&st->r_frame_rate.num, &st->r_frame_rate.den,

+                              avctx->time_base.den, (int64_t)avctx->time_base.num * avctx->ticks_per_frame, INT_MAX);

                 } else {

                     st->r_frame_rate.num = st->time_base.den;

                     st->r_frame_rate.den = st->time_base.num;