diff --git a/README.md b/README.md
index f3444707e..cf99eb03c 100644
--- a/README.md
+++ b/README.md
@@ -457,7 +457,7 @@ A beefed-up tab widget class for Qt extracted from the Qt Creator project
 
 Small, safe and fast formatting library
 
-  * Copyright: 2012–2018 by Victor Zverovich
+  * Copyright: 2012–2019 by Victor Zverovich
   * License: BSD (see `doc/licenses/fmt-BSD.txt`)
   * URL: http://fmtlib.net/latest/
   * Corresponding files: `lib/fmt/*`
diff --git a/lib/fmt b/lib/fmt
index 9e554999c..7512a55aa 160000
--- a/lib/fmt
+++ b/lib/fmt
@@ -1 +1 @@
-Subproject commit 9e554999ce02cf86fcdfe74fe740c4fe3f5a56d5
+Subproject commit 7512a55aa3ae309587ca89668ef9ec4074a51a1f
diff --git a/tests/results.txt b/tests/results.txt
index b77b78689..cc1e2fa61 100644
--- a/tests/results.txt
+++ b/tests/results.txt
@@ -176,7 +176,7 @@ T_327vp8_frame_type:0abecf2083e6fe403450aace989df415:passed:20111207-233304:0.08
 T_328dts_detected_as_ac3:54a70e8af0f47411ac5af3b3f87cfabd:passed:20111229-192324:0.090561076
 T_329X_timecodes_v2:51d1e61178c7fa2b654d1be71576113c-473bb854441388700e42ee8b4d21c61c-f531fa64a457eb3204e8f09235b039ed-646b73b730d4bd09d13a56bc861ee659-409743510ede469f8d2bf1a098ff36f8-473bb854441388700e42ee8b4d21c61c-4473fffbc0dec00c3955f861a6880b22-3b3c2e7c2470ca550acb1e913311daef-a80f23069cd692e2e8700a6729d6d290-c04e13b7e74a8d6ee694ea2cfba79009:passed:20120105-202451:1.08041896
 T_330dts_detection:c56f3d4e73bf9e4cde889b876945d574:passed:20120107-210130:1.935366715
-T_331read_buffer_underflow:9881ebacefad35351fe88c9ad036c5f6:passed:20120125-232902:0.322029153
+T_331read_buffer_underflow:cc22c16877edde6b1506a198bcbdfacd:passed:20120125-232902:0.322029153
 T_332eac3_misdetected_as_avc:8941b49cf758bbf984346839add68640:passed:20120131-145550:0.208997135
 T_333wavpack_with_correction:a9d6590516393bccea1a8e016afe4752-e33897409384ca5fd8ed5e497f8c3883+37f802510b43b2ab4bd7d8356a7ac606-ok:passed:20120131-164845:0.221105789
 T_334mp4_audio_encoder_delay:42ac98114f6f84337d266356c206a1e1:passed:20120206-100443:0.085778798
@@ -291,7 +291,7 @@ T_442ui_locale_ca_ES:b8b1ebb4a729cd34bac943b4a7eec4d5-efc218c7d73104f27e852a4d6b
 T_443hevc_keep_user_data:e54e5818b706704405600359f573c9e6:passed:20141105-202533:1.308417598
 T_444pcm_statistics_from_packaged_sources:4099f792aad1f16559c86f19cf4f51e8-4099f792aad1f16559c86f19cf4f51e8-20f16e90d6877679fc0deada17ab520b-e1393c882ba264186dadc4b1848dba24-+++:passed:20141205-220805:0.604375231
 T_445teletext_subs_missing_second_line:89313de5f917c4168b8bc6ca06843ee5:passed:20141210-224823:5.420908642
-T_446mkvinfo_output:556c05257634151205dce15c1f6bf8b5-9b9e2ab146ddc67ca8a49e24f32076aa-6ceaafcfc247c6ab5bed638b9d278835-8a7f452083781857dfc3dcd3656b5679-aa1faca6831b18e05f2b49ac37293c4b-d094b2ab02d07703bc249a427633c698-891a0b56daada2dcb49346f8d69d7480-7639702f60604d61b3cf74429fb4578d-cb75de00d1c1d271a46ad1677a503a79-e303caf638c16fe29be869bbd471510c-47b4d3c23d17dab76e16961d5ad1ed26-6319a624cd4c931b77b1b00ddd86d36a-bf0548bedcd8f0da3ec7b87e91dc0b5e-3afc38c26a3b128aa9fa82367d700604-691ec74b58f1cecb17998dc0654dad07-57fc8fa08ba41f107cfe78a1395ed0ac-457d18b25b2d8084dbdf7597b579f2d3-a9923b8cfeed255285385b188ab35506-74acd1bb1191bd0e55f092fa7bc7fac4-a5576b60abc82db8c8bd1a60fabbac2a-0c04051ff82e590d488f920ac9da1ed5-e07d256f2ec4f8b84d91b802c48a4db2-082390f37932eab3e3183cdb9eba8ab9-2ed395387b6121c9b62b7d4b1923545f:passed:20141216-165433:1.564089101
+T_446mkvinfo_output:556c05257634151205dce15c1f6bf8b5-9b9e2ab146ddc67ca8a49e24f32076aa-6ceaafcfc247c6ab5bed638b9d278835-89a79db44ae5bcc876f52fab7731fc3f-aa1faca6831b18e05f2b49ac37293c4b-d094b2ab02d07703bc249a427633c698-891a0b56daada2dcb49346f8d69d7480-7639702f60604d61b3cf74429fb4578d-cb75de00d1c1d271a46ad1677a503a79-e303caf638c16fe29be869bbd471510c-47b4d3c23d17dab76e16961d5ad1ed26-35a5965aa6ee033e69515db58b72d171-bf0548bedcd8f0da3ec7b87e91dc0b5e-3afc38c26a3b128aa9fa82367d700604-691ec74b58f1cecb17998dc0654dad07-57fc8fa08ba41f107cfe78a1395ed0ac-457d18b25b2d8084dbdf7597b579f2d3-a9923b8cfeed255285385b188ab35506-74acd1bb1191bd0e55f092fa7bc7fac4-a5576b60abc82db8c8bd1a60fabbac2a-0c04051ff82e590d488f920ac9da1ed5-e07d256f2ec4f8b84d91b802c48a4db2-082390f37932eab3e3183cdb9eba8ab9-2ed395387b6121c9b62b7d4b1923545f:passed:20141216-165433:1.564089101
 T_447mkvinfo_rounded_timecodes:409a5ad59ec67427b7983822a63ff0b7-24bfcda009b06fd3b6d90038227c5e88-1fcd406268dac205daa497b6692df4ce:passed:20141216-172642:1.712081143
 T_448mpeg_ts_with_hevc:9c38022a0e4bd7b274bf9a7fce4e9fc8:passed:20141216-181650:1.133097273
 T_449segfaults_assertions:error-2bacc50e6e28fb2a92d2abf2583405f5-ok-2684a2b671068c517bafd3a2cfb2aaca-844bf63953a1f092ccc04de6ad1d59d1-2cb3ca6660beb8cda381ab171c570ee9-error-error-ok-74082d0c0a8dec7982380cf39891a782-8c3b7c54ad1ad9b18146845f77d1a3e4-2684a2b671068c517bafd3a2cfb2aaca-2684a2b671068c517bafd3a2cfb2aaca-0fcbd3964d934f3e6dbc194aabbca3ae-68015c77e684e0bc2d45361759a5de65-0fcbd3964d934f3e6dbc194aabbca3ae:passed:20141219-195127:0.830949441