diff --git a/doc/APIchanges b/doc/APIchanges
index c0d955b1fa..8b93adebe1 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -15,6 +15,10 @@ libavutil:     2017-10-21
 
 API changes, most recent first:
 
+2021-03-16 - xxxxxxxxxx - lavf 58.75.100  - avformat.h
+  AVChapter.id will be changed from int to int64_t
+  on the next major version bump.
+
 2021-03-12 - xxxxxxxxxx - lavc 58.131.100 - avcodec.h codec.h
   Add a get_encode_buffer callback to AVCodecContext, similar to
   get_buffer2 but for encoders.
diff --git a/libavformat/aadec.c b/libavformat/aadec.c
index e88cdb89df..80ca2c12d7 100644
--- a/libavformat/aadec.c
+++ b/libavformat/aadec.c
@@ -222,7 +222,7 @@ static int aa_read_header(AVFormatContext *s)
     c->content_end = start + largest_size;
 
     while ((chapter_pos = avio_tell(pb)) >= 0 && chapter_pos < c->content_end) {
-        int chapter_idx = s->nb_chapters;
+        unsigned chapter_idx = s->nb_chapters;
         uint32_t chapter_size = avio_rb32(pb);
         if (chapter_size == 0 || avio_feof(pb))
             break;
diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index e3bd01ec7f..765bc3b6f5 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -1184,7 +1184,11 @@ typedef struct AVProgram {
                                          change dynamically at runtime. */
 
 typedef struct AVChapter {
+#if FF_API_CHAPTER_ID_INT
     int id;                 ///< unique ID to identify the chapter
+#else
+    int64_t id;             ///< unique ID to identify the chapter
+#endif
     AVRational time_base;   ///< time base in which the start/end timestamps are specified
     int64_t start, end;     ///< chapter start/end time in time_base units
     AVDictionary *metadata;
diff --git a/libavformat/internal.h b/libavformat/internal.h
index 0ffdc87b6a..df4918e318 100644
--- a/libavformat/internal.h
+++ b/libavformat/internal.h
@@ -554,7 +554,11 @@ void ff_configure_buffers_for_index(AVFormatContext *s, int64_t time_tolerance);
  *
  * @return AVChapter or NULL on error
  */
+#if FF_API_CHAPTER_ID_INT
 AVChapter *avpriv_new_chapter(AVFormatContext *s, int id, AVRational time_base,
+#else
+AVChapter *avpriv_new_chapter(AVFormatContext *s, int64_t id, AVRational time_base,
+#endif
                               int64_t start, int64_t end, const char *title);
 
 /**
diff --git a/libavformat/matroskaenc.c b/libavformat/matroskaenc.c
index 8f29d64e72..02e171593e 100644
--- a/libavformat/matroskaenc.c
+++ b/libavformat/matroskaenc.c
@@ -1669,7 +1669,11 @@ static int mkv_write_chapters(AVFormatContext *s)
         int64_t chapterstart = av_rescale_q(c->start, c->time_base, scale);
         int64_t chapterend   = av_rescale_q(c->end,   c->time_base, scale);
         const AVDictionaryEntry *t;
+#if FF_API_CHAPTER_ID_INT
         uint64_t uid = create_new_ids ? i + 1ULL : (uint32_t)c->id;
+#else
+        uint64_t uid = create_new_ids ? i + 1ULL : c->id;
+#endif
         if (chapterstart < 0 || chapterstart > chapterend || chapterend < 0) {
             av_log(s, AV_LOG_ERROR,
                    "Invalid chapter start (%"PRId64") or end (%"PRId64").\n",
diff --git a/libavformat/nutdec.c b/libavformat/nutdec.c
index ebb062377d..d1f3496990 100644
--- a/libavformat/nutdec.c
+++ b/libavformat/nutdec.c
@@ -489,8 +489,8 @@ static int decode_info_header(NUTContext *nut)
     AVIOContext *bc    = s->pb;
     uint64_t tmp, chapter_start, chapter_len;
     unsigned int stream_id_plus1, count;
-    int chapter_id, i, ret = 0;
-    int64_t value, end;
+    int i, ret = 0;
+    int64_t chapter_id, value, end;
     char name[256], str_value[1024], type_str[256];
     const char *type;
     int *event_flags        = NULL;
diff --git a/libavformat/utils.c b/libavformat/utils.c
index 8573117694..8fb5dbbf9d 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -4611,7 +4611,11 @@ AVProgram *av_new_program(AVFormatContext *ac, int id)
     return program;
 }
 
+#if FF_API_CHAPTER_ID_INT
 AVChapter *avpriv_new_chapter(AVFormatContext *s, int id, AVRational time_base,
+#else
+AVChapter *avpriv_new_chapter(AVFormatContext *s, int64_t id, AVRational time_base,
+#endif
                               int64_t start, int64_t end, const char *title)
 {
     AVChapter *chapter = NULL;
diff --git a/libavformat/version.h b/libavformat/version.h
index e43754b069..ca1cd1a920 100644
--- a/libavformat/version.h
+++ b/libavformat/version.h
@@ -32,7 +32,7 @@
 // Major bumping may affect Ticket5467, 5421, 5451(compatibility with Chromium)
 // Also please add any ticket numbers that you believe might be affected here
 #define LIBAVFORMAT_VERSION_MAJOR  58
-#define LIBAVFORMAT_VERSION_MINOR  74
+#define LIBAVFORMAT_VERSION_MINOR  75
 #define LIBAVFORMAT_VERSION_MICRO 100
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
@@ -109,6 +109,9 @@
 #ifndef FF_API_DEMUXER_OPEN
 #define FF_API_DEMUXER_OPEN             (LIBAVFORMAT_VERSION_MAJOR < 59)
 #endif
+#ifndef FF_API_CHAPTER_ID_INT
+#define FF_API_CHAPTER_ID_INT           (LIBAVFORMAT_VERSION_MAJOR < 59)
+#endif
 #ifndef FF_API_LAVF_PRIV_OPT
 #define FF_API_LAVF_PRIV_OPT            (LIBAVFORMAT_VERSION_MAJOR < 60)
 #endif
