diff --git a/libavcodec/avpacket.c b/libavcodec/avpacket.c
index 8f0850fb00..b5bac5c5f2 100644
--- a/libavcodec/avpacket.c
+++ b/libavcodec/avpacket.c
@@ -507,7 +507,11 @@ int av_packet_split_side_data(AVPacket *pkt){
 }
 #endif
 
+#if FF_API_BUFFER_SIZE_T
 uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size)
+#else
+uint8_t *av_packet_pack_dictionary(AVDictionary *dict, size_t *size)
+#endif
 {
     uint8_t *data = NULL;
     *size = 0;
@@ -526,7 +530,11 @@ uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size)
 
                 if (pass)
                     memcpy(data + total_length, str, len);
+#if FF_API_BUFFER_SIZE_T
                 else if (len > INT_MAX - total_length)
+#else
+                else if (len > SIZE_MAX - total_length)
+#endif
                     return NULL;
                 total_length += len;
             }
@@ -542,7 +550,12 @@ uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size)
     return data;
 }
 
+#if FF_API_BUFFER_SIZE_T
 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict)
+#else
+int av_packet_unpack_dictionary(const uint8_t *data, size_t size,
+                                AVDictionary **dict)
+#endif
 {
     const uint8_t *end;
     int ret;
diff --git a/libavcodec/packet.h b/libavcodec/packet.h
index da4377e09f..ca18ae631f 100644
--- a/libavcodec/packet.h
+++ b/libavcodec/packet.h
@@ -647,7 +647,11 @@ const char *av_packet_side_data_name(enum AVPacketSideDataType type);
  * @param size pointer to store the size of the returned data
  * @return pointer to data if successful, NULL otherwise
  */
+#if FF_API_BUFFER_SIZE_T
 uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size);
+#else
+uint8_t *av_packet_pack_dictionary(AVDictionary *dict, size_t *size);
+#endif
 /**
  * Unpack a dictionary from side_data.
  *
@@ -656,8 +660,12 @@ uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size);
  * @param dict the metadata storage dictionary
  * @return 0 on success, < 0 on failure
  */
+#if FF_API_BUFFER_SIZE_T
 int av_packet_unpack_dictionary(const uint8_t *data, int size, AVDictionary **dict);
-
+#else
+int av_packet_unpack_dictionary(const uint8_t *data, size_t size,
+                                AVDictionary **dict);
+#endif
 
 /**
  * Convenience function to free all the side data stored.
diff --git a/libavdevice/decklink_dec.cpp b/libavdevice/decklink_dec.cpp
index 40c3dae968..79d96cd620 100644
--- a/libavdevice/decklink_dec.cpp
+++ b/libavdevice/decklink_dec.cpp
@@ -922,7 +922,6 @@ HRESULT decklink_input_callback::VideoInputFrameArrived(
                     const char *tc = av_timecode_make_string(&tcr, tcstr, 0);
                     if (tc) {
                         AVDictionary* metadata_dict = NULL;
-                        int metadata_len;
                         uint8_t* packed_metadata;
 
                         if (av_cmp_q(ctx->video_st->r_frame_rate, av_make_q(60, 1)) < 1) {
@@ -937,6 +936,7 @@ HRESULT decklink_input_callback::VideoInputFrameArrived(
                         }
 
                         if (av_dict_set(&metadata_dict, "timecode", tc, 0) >= 0) {
+                            buffer_size_t metadata_len;
                             packed_metadata = av_packet_pack_dictionary(metadata_dict, &metadata_len);
                             av_dict_free(&metadata_dict);
                             if (packed_metadata) {
diff --git a/libavdevice/lavfi.c b/libavdevice/lavfi.c
index 94ad03268a..fdadff3f7f 100644
--- a/libavdevice/lavfi.c
+++ b/libavdevice/lavfi.c
@@ -446,7 +446,7 @@ static int lavfi_read_packet(AVFormatContext *avctx, AVPacket *pkt)
 
     frame_metadata = frame->metadata;
     if (frame_metadata) {
-        int size;
+        buffer_size_t size;
         uint8_t *metadata = av_packet_pack_dictionary(frame_metadata, &size);
 
         if (!metadata) {
diff --git a/libavformat/concatdec.c b/libavformat/concatdec.c
index 6d5b9914f9..32d4a99010 100644
--- a/libavformat/concatdec.c
+++ b/libavformat/concatdec.c
@@ -626,7 +626,7 @@ static int concat_read_packet(AVFormatContext *avf, AVPacket *pkt)
            av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, &st->time_base),
            av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, &st->time_base));
     if (cat->cur_file->metadata) {
-        int metadata_len;
+        buffer_size_t metadata_len;
         char* packed_metadata = av_packet_pack_dictionary(cat->cur_file->metadata, &metadata_len);
         if (!packed_metadata)
             return AVERROR(ENOMEM);
diff --git a/libavformat/img2dec.c b/libavformat/img2dec.c
index 6c78dada8c..be7149bb2f 100644
--- a/libavformat/img2dec.c
+++ b/libavformat/img2dec.c
@@ -381,9 +381,10 @@ int ff_img_read_header(AVFormatContext *s1)
  * as a dictionary, so it can be used by filters like 'drawtext'.
  */
 static int add_filename_as_pkt_side_data(char *filename, AVPacket *pkt) {
-    int metadata_len, ret;
     AVDictionary *d = NULL;
     char *packed_metadata = NULL;
+    buffer_size_t metadata_len;
+    int ret;
 
     av_dict_set(&d, "lavf.image2dec.source_path", filename, 0);
     av_dict_set(&d, "lavf.image2dec.source_basename", av_basename(filename), 0);
diff --git a/libavformat/oggdec.h b/libavformat/oggdec.h
index 629a1d6262..bf982bfe1c 100644
--- a/libavformat/oggdec.h
+++ b/libavformat/oggdec.h
@@ -87,7 +87,7 @@ struct ogg_stream {
     int start_trimming; ///< set the number of packets to drop from the start
     int end_trimming; ///< set the number of packets to drop from the end
     uint8_t *new_metadata;
-    unsigned int new_metadata_size;
+    buffer_size_t new_metadata_size;
     void *private;
 };