diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6ee5bfcb13..de4e499c3b 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -55,11 +55,11 @@ jobs:
       if: matrix.os == 'windows-latest'
       uses: msys2/setup-msys2@v2
       with:
-        msystem: MINGW64
+        msystem: UCRT64
         install: >-
-          mingw-w64-x86_64-autotools
-          mingw-w64-x86_64-ffmpeg
-          mingw-w64-x86_64-toolchain
+          mingw-w64-ucrt-x86_64-autotools
+          mingw-w64-ucrt-x86_64-ffmpeg
+          mingw-w64-ucrt-x86_64-toolchain
     - name: configure
       run: ./autogen.sh --enable-static --disable-shared
     - name: make
diff --git a/configure.ac b/configure.ac
index f3075f57a0..56d5cc0135 100644
--- a/configure.ac
+++ b/configure.ac
@@ -6,7 +6,7 @@ AM_INIT_AUTOMAKE([1.11 subdir-objects])
 AM_SILENT_RULES([yes])
 AM_MAINTAINER_MODE([disable])
 
-VERSION_INFO="5:1:2"
+VERSION_INFO="5:1:3"
 
 AC_MSG_CHECKING([if debug build is enabled])
 
diff --git a/doc/ffms2-api.md b/doc/ffms2-api.md
index cdbdac4882..02721cf333 100644
--- a/doc/ffms2-api.md
+++ b/doc/ffms2-api.md
@@ -586,6 +586,18 @@ const char *FFMS_GetTrackMetadataI(FFMS_Indexer *Indexer, int Track, const char
 Returns the value of the metadata entry associated with `Key` for the given track number in the media file represented by the given `FFMS_Indexer` object.
 For the list of commonly used metadata keys, see the `metadata_api Public Metadata API` comment in [avformat.h](https://code.ffmpeg.org/FFmpeg/FFmpeg/src/branch/master/libavformat/avformat.h).
 
+### FFMS_GetContainerFirstTimeI - gets the container first time
+
+[GetContainerFirstTimeI]: #ffms_getcontainerfirsttimei---gets-the-container-first-time
+```c++
+int FFMS_GetContainerFirstTimeI(FFMS_Indexer *Indexer, int64_t *pts, int *timebase);
+```
+Retrieves the container start time of the media file represented by the given `FFMS_Indexer` object.
+On success, *pts* is set to the container start timestamp (which corresponds to `AVFormatContext::start_time` in FFmpeg) and *timebase* is set to the timebase it is expressed in.
+Note that the *timebase* might be different than `FFMS_GetTimeBase`.
+Returns 0 on success.
+Returns non-0 on failure (e.g. if the container has no start time, or if *pts* or *timebase* is NULL).
+
 ### FFMS_GetFormatNameI - gets the name of the container format used in the given indexer
 
 [GetFormatNameI]: #ffms_getformatnamei---gets-the-name-of-the-container-format-used-in-the-given-indexer
diff --git a/doc/ffms2-changelog.md b/doc/ffms2-changelog.md
index 9d065aa947..21b481cd49 100644
--- a/doc/ffms2-changelog.md
+++ b/doc/ffms2-changelog.md
@@ -4,6 +4,7 @@
   - Added layered decoding support, for e.g. spatial MV-HEVC.
   - Added LastEndPTS to FFMS_VideoProperties. This field is the equivalent of LastEndTime, but it is expressed in the video timebase.
   - Added FFMS_GetTrackMetadataI.
+  - Added FFMS_GetContainerFirstTimeI.
 
 - 5.0
   - Fixed all issues with FFmpeg 6.1 which is now the minimum requirement
diff --git a/include/ffms.h b/include/ffms.h
index 3f9d455117..5517376003 100644
--- a/include/ffms.h
+++ b/include/ffms.h
@@ -22,7 +22,7 @@
 #define FFMS_H
 
 // Version format: major - minor - micro - bump
-#define FFMS_VERSION ((5 << 24) | (1 << 16) | (2 << 8) | 0)
+#define FFMS_VERSION ((5 << 24) | (1 << 16) | (3 << 8) | 0)
 
 #include <stdint.h>
 #include <stddef.h>
@@ -462,7 +462,8 @@ FFMS_API(int) FFMS_GetTrackType(FFMS_Track *T);
 FFMS_API(int) FFMS_GetTrackTypeI(FFMS_Indexer *Indexer, int Track);
 FFMS_API(FFMS_IndexErrorHandling) FFMS_GetErrorHandling(FFMS_Index *Index);
 FFMS_API(const char *) FFMS_GetCodecNameI(FFMS_Indexer *Indexer, int Track);
-FFMS_API(const char *) FFMS_GetTrackMetadataI(FFMS_Indexer *Indexer, int Track, const char *Key);
+FFMS_API(const char *) FFMS_GetTrackMetadataI(FFMS_Indexer *Indexer, int Track, const char *Key); /* Introduced in FFMS_VERSION ((5 << 24) | (1 << 16) | (2 << 8) | 0) */
+FFMS_API(int) FFMS_GetContainerFirstTimeI(FFMS_Indexer *Indexer, int64_t *pts, int *timebase); /* Introduced in FFMS_VERSION ((5 << 24) | (1 << 16) | (3 << 8) | 0) */
 FFMS_API(const char *) FFMS_GetFormatNameI(FFMS_Indexer *Indexer);
 FFMS_API(int) FFMS_GetNumFrames(FFMS_Track *T);
 FFMS_API(const FFMS_FrameInfo *) FFMS_GetFrameInfo(FFMS_Track *T, int Frame);
diff --git a/src/core/ffms.cpp b/src/core/ffms.cpp
index cbfe88e2a0..3340fdbe44 100644
--- a/src/core/ffms.cpp
+++ b/src/core/ffms.cpp
@@ -274,6 +274,10 @@ FFMS_API(const char *) FFMS_GetTrackMetadataI(FFMS_Indexer *Indexer, int Track,
     return Indexer->GetTrackMetadata(Track, Key);
 }
 
+FFMS_API(int) FFMS_GetContainerFirstTimeI(FFMS_Indexer *Indexer, int64_t *pts, int *timebase) {
+    return Indexer->GetFirstTime(pts, timebase);
+}
+
 FFMS_API(int) FFMS_GetNumFrames(FFMS_Track *T) {
     return T->VisibleFrameCount();
 }
diff --git a/src/core/indexing.cpp b/src/core/indexing.cpp
index 821ba053d9..40c7ca15bd 100644
--- a/src/core/indexing.cpp
+++ b/src/core/indexing.cpp
@@ -437,6 +437,16 @@ const char *FFMS_Indexer::GetTrackMetadata(int Track, const char *Key) {
     return Entry ? Entry->value : nullptr;
 }
 
+int FFMS_Indexer::GetFirstTime(int64_t *pts, int *timebase) {
+    if (FormatContext->start_time == AV_NOPTS_VALUE || !pts || !timebase)
+        return 1;
+
+    *pts = FormatContext->start_time;
+    *timebase = AV_TIME_BASE;
+
+    return 0;
+}
+
 FFMS_Index *FFMS_Indexer::DoIndexing() {
     std::vector<SharedAVContext> AVContexts(FormatContext->nb_streams);
 
diff --git a/src/core/indexing.h b/src/core/indexing.h
index 4a79e75ff9..e6ab861afb 100644
--- a/src/core/indexing.h
+++ b/src/core/indexing.h
@@ -101,6 +101,7 @@ struct FFMS_Indexer {
     FFMS_TrackType GetTrackType(int Track);
     const char *GetTrackCodec(int Track);
     const char *GetTrackMetadata(int Track, const char *Key);
+    int GetFirstTime(int64_t *pts, int *timebase);
     const char *GetFormatName();
 };