diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index 2fa31bad0a..01e6e79f3f 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -566,6 +566,7 @@ static int mkv_write_tracks(AVFormatContext *s)
         switch (codec->codec_type) {
             case AVMEDIA_TYPE_VIDEO:
                 put_ebml_uint(pb, MATROSKA_ID_TRACKTYPE, MATROSKA_TRACK_TYPE_VIDEO);
+                put_ebml_uint(pb, MATROSKA_ID_TRACKDEFAULTDURATION, av_q2d(codec->time_base)*1E9);
 
                 if (!native_id &&
                       ff_codec_get_tag(codec_movvideo_tags, codec->codec_id) &&
diff --git a/tests/ref/lavf/mkv b/tests/ref/lavf/mkv
index bcf7ff309f..213d38b758 100644
--- a/tests/ref/lavf/mkv
+++ b/tests/ref/lavf/mkv
@@ -1,3 +1,3 @@
-a0ce20d849aea1c6e138dd1101c8f162 *./tests/data/lavf/lavf.mkv
-  320463 ./tests/data/lavf/lavf.mkv
+cf230e089e737ed9449fbfb3cb87da92 *./tests/data/lavf/lavf.mkv
+  320471 ./tests/data/lavf/lavf.mkv
 ./tests/data/lavf/lavf.mkv CRC=0x2a83e6b0
diff --git a/tests/ref/seek/lavf.mkv.ref b/tests/ref/seek/lavf.mkv.ref
index 0cc6839a8a..5af4488d2c 100644
--- a/tests/ref/seek/lavf.mkv.ref
+++ b/tests/ref/seek/lavf.mkv.ref
@@ -1,53 +1,53 @@
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:    505 size: 27837
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:    513 size: 27837
 ret: 0         st:-1 flags:0  ts:-1.000000
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:    505 size: 27837
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:    513 size: 27837
 ret: 0         st:-1 flags:1  ts: 1.894167
-ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 291894 size: 27834
+ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 291902 size: 27834
 ret: 0         st: 0 flags:0  ts: 0.788000
-ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 291894 size: 27834
+ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 291902 size: 27834
 ret: 0         st: 0 flags:1  ts:-0.317000
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:    505 size: 27837
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:    513 size: 27837
 ret: 0         st: 1 flags:0  ts: 2.577000
 ret:-EOF
 ret: 0         st: 1 flags:1  ts: 1.471000
-ret: 0         st: 1 flags:1 dts: 1.019000 pts: 1.019000 pos: 320167 size:   209
+ret: 0         st: 1 flags:1 dts: 1.019000 pts: 1.019000 pos: 320175 size:   209
 ret: 0         st:-1 flags:0  ts: 0.365002
-ret: 0         st: 0 flags:1 dts: 0.480000 pts: 0.480000 pos: 146679 size: 27925
+ret: 0         st: 0 flags:1 dts: 0.480000 pts: 0.480000 pos: 146687 size: 27925
 ret: 0         st:-1 flags:1  ts:-0.740831
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:    505 size: 27837
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:    513 size: 27837
 ret: 0         st: 0 flags:0  ts: 2.153000
 ret:-EOF
 ret: 0         st: 0 flags:1  ts: 1.048000
-ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 291894 size: 27834
+ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 291902 size: 27834
 ret: 0         st: 1 flags:0  ts:-0.058000
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:    505 size: 27837
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:    513 size: 27837
 ret: 0         st: 1 flags:1  ts: 2.836000
-ret: 0         st: 1 flags:1 dts: 1.019000 pts: 1.019000 pos: 320167 size:   209
+ret: 0         st: 1 flags:1 dts: 1.019000 pts: 1.019000 pos: 320175 size:   209
 ret: 0         st:-1 flags:0  ts: 1.730004
 ret:-EOF
 ret: 0         st:-1 flags:1  ts: 0.624171
-ret: 0         st: 0 flags:1 dts: 0.480000 pts: 0.480000 pos: 146679 size: 27925
+ret: 0         st: 0 flags:1 dts: 0.480000 pts: 0.480000 pos: 146687 size: 27925
 ret: 0         st: 0 flags:0  ts:-0.482000
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:    505 size: 27837
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:    513 size: 27837
 ret: 0         st: 0 flags:1  ts: 2.413000
-ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 291894 size: 27834
+ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 291902 size: 27834
 ret: 0         st: 1 flags:0  ts: 1.307000
 ret:-EOF
 ret: 0         st: 1 flags:1  ts: 0.201000
-ret: 0         st: 1 flags:1 dts: 0.183000 pts: 0.183000 pos:  72075 size:   209
+ret: 0         st: 1 flags:1 dts: 0.183000 pts: 0.183000 pos:  72083 size:   209
 ret: 0         st:-1 flags:0  ts:-0.904994
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:    505 size: 27837
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:    513 size: 27837
 ret: 0         st:-1 flags:1  ts: 1.989173
-ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 291894 size: 27834
+ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 291902 size: 27834
 ret: 0         st: 0 flags:0  ts: 0.883000
-ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 291894 size: 27834
+ret: 0         st: 0 flags:1 dts: 0.960000 pts: 0.960000 pos: 291902 size: 27834
 ret: 0         st: 0 flags:1  ts:-0.222000
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:    505 size: 27837
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:    513 size: 27837
 ret: 0         st: 1 flags:0  ts: 2.672000
 ret:-EOF
 ret: 0         st: 1 flags:1  ts: 1.566000
-ret: 0         st: 1 flags:1 dts: 1.019000 pts: 1.019000 pos: 320167 size:   209
+ret: 0         st: 1 flags:1 dts: 1.019000 pts: 1.019000 pos: 320175 size:   209
 ret: 0         st:-1 flags:0  ts: 0.460008
-ret: 0         st: 0 flags:1 dts: 0.480000 pts: 0.480000 pos: 146679 size: 27925
+ret: 0         st: 0 flags:1 dts: 0.480000 pts: 0.480000 pos: 146687 size: 27925
 ret: 0         st:-1 flags:1  ts:-0.645825
-ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:    505 size: 27837
+ret: 0         st: 0 flags:1 dts: 0.000000 pts: 0.000000 pos:    513 size: 27837