diff --git a/sub/dec_sub.c b/sub/dec_sub.c
index 9261e2570d..a9267112f4 100644
--- a/sub/dec_sub.c
+++ b/sub/dec_sub.c
@@ -356,8 +356,8 @@ static void multiply_timings(struct packet_list *subs, double factor)
 // overlapping lines. (It's not worth the trouble.)
 static void fix_overlaps_and_gaps(struct packet_list *subs)
 {
-    double threshold = 0.2;     // up to 200 ms overlaps or gaps are removed
-    double keep = threshold * 2;// don't change timings if durations are smaller
+    double threshold = SUB_GAP_THRESHOLD;
+    double keep = SUB_GAP_KEEP;
     for (int i = 0; i < subs->num_packets - 1; i++) {
         struct demux_packet *cur = subs->packets[i];
         struct demux_packet *next = subs->packets[i + 1];
diff --git a/sub/sd.h b/sub/sd.h
index 4be48fedb8..9e6b1eb0ec 100644
--- a/sub/sd.h
+++ b/sub/sd.h
@@ -4,6 +4,11 @@
 #include "dec_sub.h"
 #include "demux/packet.h"
 
+// up to 200 ms overlaps or gaps are removed
+#define SUB_GAP_THRESHOLD 0.2
+// don't change timings if durations are smaller
+#define SUB_GAP_KEEP 0.4
+
 struct sd {
     struct mp_log *log;
     struct MPOpts *opts;
diff --git a/sub/sd_lavc.c b/sub/sd_lavc.c
index d6f6bf8e48..563ac554fc 100644
--- a/sub/sd_lavc.c
+++ b/sub/sd_lavc.c
@@ -202,6 +202,9 @@ static void decode(struct sd *sd, struct demux_packet *packet)
             if (prev->endpts == MP_NOPTS_VALUE || prev->endpts > pts)
                 prev->endpts = pts;
 
+            if (opts->sub_fix_timing && pts - prev->endpts <= SUB_GAP_THRESHOLD)
+                prev->endpts = pts;
+
             for (int n = 0; n < priv->num_seekpoints; n++) {
                 if (priv->seekpoints[n].pts == prev->pts) {
                     priv->seekpoints[n].endpts = prev->endpts;