lavf/utils: Avoid an overflow for huge negative durations.

Fixes ticket #5135.

diff --git a/libavformat/utils.c b/libavformat/utils.c
index 93ea6ff..3e0f57d 100644 (file)
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -2547,7 +2547,7 @@ static void update_stream_timings(AVFormatContext *ic)
             end_time1 = av_rescale_q_rnd(st->duration, st->time_base,
                                          AV_TIME_BASE_Q,
                                          AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX);
-            if (end_time1 != AV_NOPTS_VALUE && start_time1 <= INT64_MAX - end_time1) {
+            if (end_time1 != AV_NOPTS_VALUE && (end_time1 > 0 ? start_time1 <= INT64_MAX - end_time1 : start_time1 >= INT64_MIN - end_time1)) {
                 end_time1 += start_time1;
                 end_time = FFMAX(end_time, end_time1);
             }