diff --git a/doc/APIchanges b/doc/APIchanges
index 81537fea09..9f091f5ec5 100644
--- a/doc/APIchanges
+++ b/doc/APIchanges
@@ -2,6 +2,9 @@ The last version increases of all libraries were on 2024-03-07
 
 API changes, most recent first:
 
+2024-09-xx - xxxxxxxxxx - lavf 61.7.100 - avformat.h
+  Add av_get_frame_filename3()
+
 2024-09-18 - xxxxxxxxxx - lavc 61.17.100 - packet.h
   Add AV_PKT_DATA_LCEVC.
 
diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 56c1c80289..1bc0e716dc 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -2932,11 +2932,14 @@ void av_dump_format(AVFormatContext *ic,
  *
  * @param buf destination buffer
  * @param buf_size destination buffer size
- * @param path numbered sequence string
- * @param number frame number
+ * @param path path with substitution template
+ * @param number the number to substitute
  * @param flags AV_FRAME_FILENAME_FLAGS_*
  * @return 0 if OK, -1 on format error
  */
+int av_get_frame_filename3(char *buf, int buf_size,
+                          const char *path, int64_t number, int flags);
+
 int av_get_frame_filename2(char *buf, int buf_size,
                           const char *path, int number, int flags);
 
diff --git a/libavformat/img2enc.c b/libavformat/img2enc.c
index 526a11e5ee..460e6a38bd 100644
--- a/libavformat/img2enc.c
+++ b/libavformat/img2enc.c
@@ -160,13 +160,11 @@ static int write_packet(AVFormatContext *s, AVPacket *pkt)
             return AVERROR(EINVAL);
         }
     } else if (img->frame_pts) {
-        if (av_get_frame_filename2(filename, sizeof(filename), s->url, pkt->pts, AV_FRAME_FILENAME_FLAGS_MULTIPLE) < 0) {
+        if (av_get_frame_filename3(filename, sizeof(filename), s->url, pkt->pts, AV_FRAME_FILENAME_FLAGS_MULTIPLE) < 0) {
             av_log(s, AV_LOG_ERROR, "Cannot write filename by pts of the frames.");
             return AVERROR(EINVAL);
         }
-    } else if (av_get_frame_filename2(filename, sizeof(filename), s->url,
-                                      img->img_number,
-                                      AV_FRAME_FILENAME_FLAGS_MULTIPLE) < 0) {
+    } else if (av_get_frame_filename3(filename, sizeof(filename), s->url, img->img_number, AV_FRAME_FILENAME_FLAGS_MULTIPLE) < 0) {
         if (img->img_number == img->start_img_number) {
             av_log(s, AV_LOG_WARNING, "The specified filename '%s' does not contain an image sequence pattern or a pattern is invalid.\n", s->url);
             av_log(s, AV_LOG_WARNING,
diff --git a/libavformat/utils.c b/libavformat/utils.c
index e9ded627ad..0a7ed1a013 100644
--- a/libavformat/utils.c
+++ b/libavformat/utils.c
@@ -19,6 +19,7 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include <inttypes.h>
 #include <stdint.h>
 
 #include "config.h"
@@ -280,7 +281,7 @@ uint64_t ff_parse_ntp_time(uint64_t ntp_ts)
     return (sec * 1000000) + usec;
 }
 
-int av_get_frame_filename2(char *buf, int buf_size, const char *path, int number, int flags)
+int av_get_frame_filename3(char *buf, int buf_size, const char *path, int64_t number, int flags)
 {
     const char *p;
     char *q, buf1[20], c;
@@ -313,7 +314,7 @@ int av_get_frame_filename2(char *buf, int buf_size, const char *path, int number
                 percentd_found = 1;
                 if (number < 0)
                     nd += 1;
-                snprintf(buf1, sizeof(buf1), "%0*d", nd, number);
+                snprintf(buf1, sizeof(buf1), "%0*"PRId64, nd, number);
                 len = strlen(buf1);
                 if ((q - buf + len) > buf_size - 1)
                     goto fail;
@@ -338,9 +339,14 @@ fail:
     return -1;
 }
 
+int av_get_frame_filename2(char *buf, int buf_size, const char *path, int number, int flags)
+{
+    return av_get_frame_filename3(buf, buf_size, path, number, flags);
+}
+
 int av_get_frame_filename(char *buf, int buf_size, const char *path, int number)
 {
-    return av_get_frame_filename2(buf, buf_size, path, number, 0);
+    return av_get_frame_filename3(buf, buf_size, path, number, 0);
 }
 
 void av_url_split(char *proto, int proto_size,
diff --git a/libavformat/version.h b/libavformat/version.h
index 4bde82abb4..70c554c19c 100644
--- a/libavformat/version.h
+++ b/libavformat/version.h
@@ -31,7 +31,7 @@
 
 #include "version_major.h"
 
-#define LIBAVFORMAT_VERSION_MINOR   6
+#define LIBAVFORMAT_VERSION_MINOR   7
 #define LIBAVFORMAT_VERSION_MICRO 100
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
