diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index 45a2341c22..17e1f8dec9 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -835,7 +835,7 @@ static int mkv_write_video_color(AVIOContext *pb, AVCodecParameters *par, AVStre
                                         &side_data_size);
     if (side_data_size == sizeof(AVMasteringDisplayMetadata)) {
         ebml_master meta_element = start_ebml_master(
-            dyn_cp, MATROSKA_ID_VIDEOCOLORMASTERINGMETA, 0);
+            dyn_cp, MATROSKA_ID_VIDEOCOLORMASTERINGMETA, 10 * (2 + 1 + 8));
         const AVMasteringDisplayMetadata *metadata =
             (const AVMasteringDisplayMetadata*)side_data;
         if (metadata->has_primaries) {
@@ -1299,7 +1299,7 @@ static int mkv_write_track(AVFormatContext *s, MatroskaMuxContext *mkv,
             // no mkv-specific ID, use ACM mode
             put_ebml_string(pb, MATROSKA_ID_CODECID, "A_MS/ACM");
 
-        subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 0);
+        subinfo = start_ebml_master(pb, MATROSKA_ID_TRACKAUDIO, 6 + 4 * 9);
         put_ebml_uint  (pb, MATROSKA_ID_AUDIOCHANNELS    , par->channels);
 
         track->sample_rate_offset = avio_tell(pb);
@@ -1495,7 +1495,7 @@ static int mkv_write_tag_targets(AVFormatContext *s, uint32_t elementid,
     pb = mkv->tags_bc;
 
     *tag    = start_ebml_master(pb, MATROSKA_ID_TAG,        0);
-    targets = start_ebml_master(pb, MATROSKA_ID_TAGTARGETS, 0);
+    targets = start_ebml_master(pb, MATROSKA_ID_TAGTARGETS, 4 + 1 + 8);
     if (elementid)
         put_ebml_uid(pb, elementid, uid);
     end_ebml_master(pb, targets);
@@ -1585,7 +1585,8 @@ static int mkv_write_tags(AVFormatContext *s)
             AVIOContext *pb = mkv->tags_bc;
             ebml_master simpletag;
 
-            simpletag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG, 0);
+            simpletag = start_ebml_master(pb, MATROSKA_ID_SIMPLETAG,
+                                          2 + 1 + 8 + 23);
             put_ebml_string(pb, MATROSKA_ID_TAGNAME, "DURATION");
             mkv->tracks[i].duration_offset = avio_tell(pb);
 
diff --git a/tests/fate/wavpack.mak b/tests/fate/wavpack.mak
index e3cf4ec632..c62b3ceefd 100644
--- a/tests/fate/wavpack.mak
+++ b/tests/fate/wavpack.mak
@@ -91,12 +91,12 @@ fate-wavpack-matroskamode: CMD = md5 -i $(TARGET_SAMPLES)/wavpack/special/matros
 FATE_WAVPACK-$(call DEMMUX, WV, MATROSKA) += fate-wavpack-matroska_mux-mono
 fate-wavpack-matroska_mux-mono: CMD = md5pipe -i $(TARGET_SAMPLES)/wavpack/num_channels/mono_16bit_int.wv -c copy -fflags +bitexact -f matroska
 fate-wavpack-matroska_mux-mono: CMP = oneline
-fate-wavpack-matroska_mux-mono: REF = 7ebd447336f0ba76b41a3f32d1551f05
+fate-wavpack-matroska_mux-mono: REF = a378996c1bb5a54998fc804fb1ad97b1
 
 FATE_WAVPACK-$(call DEMMUX, WV, MATROSKA) += fate-wavpack-matroska_mux-61
 fate-wavpack-matroska_mux-61: CMD = md5pipe -i $(TARGET_SAMPLES)/wavpack/num_channels/eva_2.22_6.1_16bit-partial.wv -c copy -fflags +bitexact -f matroska
 fate-wavpack-matroska_mux-61: CMP = oneline
-fate-wavpack-matroska_mux-61: REF = c95bca3c3023230a324c633942c453d5
+fate-wavpack-matroska_mux-61: REF = 3d708dfce5ac85df114ea91b30143708
 
 FATE_SAMPLES_AVCONV += $(FATE_WAVPACK-yes)
 fate-wavpack: $(FATE_WAVPACK-yes)
diff --git a/tests/ref/fate/aac-autobsf-adtstoasc b/tests/ref/fate/aac-autobsf-adtstoasc
index d9191fb37f..c7eae5d6c1 100644
--- a/tests/ref/fate/aac-autobsf-adtstoasc
+++ b/tests/ref/fate/aac-autobsf-adtstoasc
@@ -1,5 +1,5 @@
-76a14cc1b3292c7f724006d56b7e2eac *tests/data/fate/aac-autobsf-adtstoasc.matroska
-6648 tests/data/fate/aac-autobsf-adtstoasc.matroska
+6ffdfc7f11f06f94c22cda3a29bf576b *tests/data/fate/aac-autobsf-adtstoasc.matroska
+6627 tests/data/fate/aac-autobsf-adtstoasc.matroska
 #extradata 0:        2, 0x0030001c
 #tb 0: 1/1000
 #media_type 0: audio
diff --git a/tests/ref/fate/matroska-flac-extradata-update b/tests/ref/fate/matroska-flac-extradata-update
index 16b268c4a8..890bf1ac52 100644
--- a/tests/ref/fate/matroska-flac-extradata-update
+++ b/tests/ref/fate/matroska-flac-extradata-update
@@ -1,5 +1,5 @@
-5f6a67a45906f1bc7dd11d840470b0e4 *tests/data/fate/matroska-flac-extradata-update.matroska
-2071 tests/data/fate/matroska-flac-extradata-update.matroska
+2b82ee67ace359edb464e289486b3ebd *tests/data/fate/matroska-flac-extradata-update.matroska
+2008 tests/data/fate/matroska-flac-extradata-update.matroska
 #extradata 0:       34, 0x7acb09e7
 #extradata 1:       34, 0x7acb09e7
 #extradata 2:       34, 0x443402dd
diff --git a/tests/ref/fate/rgb24-mkv b/tests/ref/fate/rgb24-mkv
index fc73604ebc..c9438dffe4 100644
--- a/tests/ref/fate/rgb24-mkv
+++ b/tests/ref/fate/rgb24-mkv
@@ -1,5 +1,5 @@
-661b2d8ad9b7c5bf7389d3408c3695c4 *tests/data/fate/rgb24-mkv.matroska
-58206 tests/data/fate/rgb24-mkv.matroska
+84474651e0744e7049e27dd19b8c18a8 *tests/data/fate/rgb24-mkv.matroska
+58192 tests/data/fate/rgb24-mkv.matroska
 #tb 0: 1/10
 #media_type 0: video
 #codec_id 0: rawvideo
diff --git a/tests/ref/lavf-fate/av1.mkv b/tests/ref/lavf-fate/av1.mkv
index 28a8c890c7..3288a4481d 100644
--- a/tests/ref/lavf-fate/av1.mkv
+++ b/tests/ref/lavf-fate/av1.mkv
@@ -1,3 +1,3 @@
-339f457b665fb5e8652fd50f2d3c4823 *tests/data/lavf-fate/lavf.av1.mkv
-55650 tests/data/lavf-fate/lavf.av1.mkv
+696074a7600fb5a02a434839d09201f0 *tests/data/lavf-fate/lavf.av1.mkv
+55636 tests/data/lavf-fate/lavf.av1.mkv
 tests/data/lavf-fate/lavf.av1.mkv CRC=0x7c27cc15
diff --git a/tests/ref/lavf/mka b/tests/ref/lavf/mka
index 24ccef51fd..303867228c 100644
--- a/tests/ref/lavf/mka
+++ b/tests/ref/lavf/mka
@@ -1,3 +1,3 @@
-df7155d4333e9993c9ea2a9d53868881 *tests/data/lavf/lavf.mka
-43580 tests/data/lavf/lavf.mka
+a67d0e6113de91ee53ee00b47fa6ff42 *tests/data/lavf/lavf.mka
+43559 tests/data/lavf/lavf.mka
 tests/data/lavf/lavf.mka CRC=0x3a1da17e
diff --git a/tests/ref/lavf/mkv b/tests/ref/lavf/mkv
index 014ea06003..9eaf5a4a11 100644
--- a/tests/ref/lavf/mkv
+++ b/tests/ref/lavf/mkv
@@ -1,3 +1,3 @@
-06c38b55305367672a7fc4efb71947bc *tests/data/lavf/lavf.mkv
-320446 tests/data/lavf/lavf.mkv
+e08b2effe716fb6b72f4a2cd2598b6d4 *tests/data/lavf/lavf.mkv
+320411 tests/data/lavf/lavf.mkv
 tests/data/lavf/lavf.mkv CRC=0xec6c3c68
diff --git a/tests/ref/lavf/mkv_attachment b/tests/ref/lavf/mkv_attachment
index f297d407c8..d6cd1cdf64 100644
--- a/tests/ref/lavf/mkv_attachment
+++ b/tests/ref/lavf/mkv_attachment
@@ -1,3 +1,3 @@
-cf27537eabb1f4f222e7391aa4f5250d *tests/data/lavf/lavf.mkv_attachment
-472601 tests/data/lavf/lavf.mkv_attachment
+aa2419820c590d0512ce199b7b59b9c9 *tests/data/lavf/lavf.mkv_attachment
+472566 tests/data/lavf/lavf.mkv_attachment
 tests/data/lavf/lavf.mkv_attachment CRC=0xec6c3c68
diff --git a/tests/ref/seek/lavf-mkv b/tests/ref/seek/lavf-mkv
index e9f1e521f2..3299861d9c 100644
--- a/tests/ref/seek/lavf-mkv
+++ b/tests/ref/seek/lavf-mkv
@@ -1,48 +1,48 @@
-ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    694 size:   208
+ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    659 size:   208
 ret: 0         st:-1 flags:0  ts:-1.000000
-ret: 0         st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos:    910 size: 27837
+ret: 0         st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos:    875 size: 27837
 ret: 0         st:-1 flags:1  ts: 1.894167
-ret: 0         st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292326 size: 27834
+ret: 0         st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292291 size: 27834
 ret: 0         st: 0 flags:0  ts: 0.788000
-ret: 0         st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292326 size: 27834
+ret: 0         st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292291 size: 27834
 ret: 0         st: 0 flags:1  ts:-0.317000
-ret: 0         st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos:    910 size: 27837
+ret: 0         st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos:    875 size: 27837
 ret:-1         st: 1 flags:0  ts: 2.577000
 ret: 0         st: 1 flags:1  ts: 1.471000
-ret: 0         st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 320167 size:   209
+ret: 0         st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 320132 size:   209
 ret: 0         st:-1 flags:0  ts: 0.365002
-ret: 0         st: 0 flags:1 dts: 0.491000 pts: 0.491000 pos: 146878 size: 27925
+ret: 0         st: 0 flags:1 dts: 0.491000 pts: 0.491000 pos: 146843 size: 27925
 ret: 0         st:-1 flags:1  ts:-0.740831
-ret: 0         st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos:    910 size: 27837
+ret: 0         st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos:    875 size: 27837
 ret:-1         st: 0 flags:0  ts: 2.153000
 ret: 0         st: 0 flags:1  ts: 1.048000
-ret: 0         st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292326 size: 27834
+ret: 0         st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292291 size: 27834
 ret: 0         st: 1 flags:0  ts:-0.058000
-ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    694 size:   208
+ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    659 size:   208
 ret: 0         st: 1 flags:1  ts: 2.836000
-ret: 0         st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 320167 size:   209
+ret: 0         st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 320132 size:   209
 ret:-1         st:-1 flags:0  ts: 1.730004
 ret: 0         st:-1 flags:1  ts: 0.624171
-ret: 0         st: 0 flags:1 dts: 0.491000 pts: 0.491000 pos: 146878 size: 27925
+ret: 0         st: 0 flags:1 dts: 0.491000 pts: 0.491000 pos: 146843 size: 27925
 ret: 0         st: 0 flags:0  ts:-0.482000
-ret: 0         st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos:    910 size: 27837
+ret: 0         st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos:    875 size: 27837
 ret: 0         st: 0 flags:1  ts: 2.413000
-ret: 0         st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292326 size: 27834
+ret: 0         st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292291 size: 27834
 ret:-1         st: 1 flags:0  ts: 1.307000
 ret: 0         st: 1 flags:1  ts: 0.201000
-ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    694 size:   208
+ret: 0         st: 1 flags:1 dts: 0.000000 pts: 0.000000 pos:    659 size:   208
 ret: 0         st:-1 flags:0  ts:-0.904994
-ret: 0         st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos:    910 size: 27837
+ret: 0         st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos:    875 size: 27837
 ret: 0         st:-1 flags:1  ts: 1.989173
-ret: 0         st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292326 size: 27834
+ret: 0         st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292291 size: 27834
 ret: 0         st: 0 flags:0  ts: 0.883000
-ret: 0         st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292326 size: 27834
+ret: 0         st: 0 flags:1 dts: 0.971000 pts: 0.971000 pos: 292291 size: 27834
 ret: 0         st: 0 flags:1  ts:-0.222000
-ret: 0         st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos:    910 size: 27837
+ret: 0         st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos:    875 size: 27837
 ret:-1         st: 1 flags:0  ts: 2.672000
 ret: 0         st: 1 flags:1  ts: 1.566000
-ret: 0         st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 320167 size:   209
+ret: 0         st: 1 flags:1 dts: 0.993000 pts: 0.993000 pos: 320132 size:   209
 ret: 0         st:-1 flags:0  ts: 0.460008
-ret: 0         st: 0 flags:1 dts: 0.491000 pts: 0.491000 pos: 146878 size: 27925
+ret: 0         st: 0 flags:1 dts: 0.491000 pts: 0.491000 pos: 146843 size: 27925
 ret: 0         st:-1 flags:1  ts:-0.645825
-ret: 0         st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos:    910 size: 27837
+ret: 0         st: 0 flags:1 dts: 0.011000 pts: 0.011000 pos:    875 size: 27837
