diff --git a/libavformat/utils.c b/libavformat/utils.c
index 27071e10b4..17c85e0aaa 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -2884,6 +2884,7 @@ static void estimate_timings(AVFormatContext *ic, int64_t old_offset)
         AVStream av_unused *st;
         for (i = 0; i < ic->nb_streams; i++) {
             st = ic->streams[i];
+            if (st->time_base.den)
             av_log(ic, AV_LOG_TRACE, "stream %d: start_time: %0.3f duration: %0.3f\n", i,
                    (double) st->start_time * av_q2d(st->time_base),
                    (double) st->duration   * av_q2d(st->time_base));