diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index f8c44a8f2c..4492e76e82 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -2042,8 +2042,9 @@ static int matroska_parse_tracks(AVFormatContext *s)
                 st->need_parsing = AVSTREAM_PARSE_HEADERS;
 
             if (track->default_duration) {
+                int div = track->default_duration <= INT64_MAX ? 1 : 2;
                 av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
-                          1000000000, track->default_duration, 30000);
+                          1000000000 / div, track->default_duration / div, 30000);
 #if FF_API_R_FRAME_RATE
                 if (   st->avg_frame_rate.num < st->avg_frame_rate.den * 1000LL
                     && st->avg_frame_rate.num > st->avg_frame_rate.den * 5LL)