diff --git a/libavcodec/avpacket.c b/libavcodec/avpacket.c
index 4995a83bf8..622b50d5eb 100644
--- a/libavcodec/avpacket.c
+++ b/libavcodec/avpacket.c
@@ -297,93 +297,6 @@ const char *av_packet_side_data_name(enum AVPacketSideDataType type)
     return NULL;
 }
 
-#if FF_API_MERGE_SD_API
-
-#define FF_MERGE_MARKER 0x8c4d9d108e25e9feULL
-
-int av_packet_merge_side_data(AVPacket *pkt){
-    if(pkt->side_data_elems){
-        AVBufferRef *buf;
-        int i;
-        uint8_t *p;
-        uint64_t size= pkt->size + 8LL + AV_INPUT_BUFFER_PADDING_SIZE;
-        AVPacket old= *pkt;
-        for (i=0; i<old.side_data_elems; i++) {
-            size += old.side_data[i].size + 5LL;
-        }
-        if (size > INT_MAX)
-            return AVERROR(EINVAL);
-        buf = av_buffer_alloc(size);
-        if (!buf)
-            return AVERROR(ENOMEM);
-        pkt->buf = buf;
-        pkt->data = p = buf->data;
-        pkt->size = size - AV_INPUT_BUFFER_PADDING_SIZE;
-        bytestream_put_buffer(&p, old.data, old.size);
-        for (i=old.side_data_elems-1; i>=0; i--) {
-            bytestream_put_buffer(&p, old.side_data[i].data, old.side_data[i].size);
-            bytestream_put_be32(&p, old.side_data[i].size);
-            *p++ = old.side_data[i].type | ((i==old.side_data_elems-1)*128);
-        }
-        bytestream_put_be64(&p, FF_MERGE_MARKER);
-        av_assert0(p-pkt->data == pkt->size);
-        memset(p, 0, AV_INPUT_BUFFER_PADDING_SIZE);
-        av_packet_unref(&old);
-        pkt->side_data_elems = 0;
-        pkt->side_data = NULL;
-        return 1;
-    }
-    return 0;
-}
-
-int av_packet_split_side_data(AVPacket *pkt){
-    if (!pkt->side_data_elems && pkt->size >12 && AV_RB64(pkt->data + pkt->size - 8) == FF_MERGE_MARKER){
-        int i;
-        unsigned int size;
-        uint8_t *p;
-
-        p = pkt->data + pkt->size - 8 - 5;
-        for (i=1; ; i++){
-            size = AV_RB32(p);
-            if (size>INT_MAX - 5 || p - pkt->data < size)
-                return 0;
-            if (p[4]&128)
-                break;
-            if (p - pkt->data < size + 5)
-                return 0;
-            p-= size+5;
-        }
-
-        if (i > AV_PKT_DATA_NB)
-            return AVERROR(ERANGE);
-
-        pkt->side_data = av_malloc_array(i, sizeof(*pkt->side_data));
-        if (!pkt->side_data)
-            return AVERROR(ENOMEM);
-
-        p= pkt->data + pkt->size - 8 - 5;
-        for (i=0; ; i++){
-            size= AV_RB32(p);
-            av_assert0(size<=INT_MAX - 5 && p - pkt->data >= size);
-            pkt->side_data[i].data = av_mallocz(size + AV_INPUT_BUFFER_PADDING_SIZE);
-            pkt->side_data[i].size = size;
-            pkt->side_data[i].type = p[4]&127;
-            if (!pkt->side_data[i].data)
-                return AVERROR(ENOMEM);
-            memcpy(pkt->side_data[i].data, p-size, size);
-            pkt->size -= size + 5;
-            if(p[4]&128)
-                break;
-            p-= size+5;
-        }
-        pkt->size -= 8;
-        pkt->side_data_elems = i+1;
-        return 1;
-    }
-    return 0;
-}
-#endif
-
 #if FF_API_BUFFER_SIZE_T
 uint8_t *av_packet_pack_dictionary(AVDictionary *dict, int *size)
 #else
diff --git a/libavcodec/packet.h b/libavcodec/packet.h
index a4cd8f5615..6e6d9c58c9 100644
--- a/libavcodec/packet.h
+++ b/libavcodec/packet.h
@@ -581,14 +581,6 @@ uint8_t* av_packet_get_side_data(const AVPacket *pkt, enum AVPacketSideDataType
                                  size_t *size);
 #endif
 
-#if FF_API_MERGE_SD_API
-attribute_deprecated
-int av_packet_merge_side_data(AVPacket *pkt);
-
-attribute_deprecated
-int av_packet_split_side_data(AVPacket *pkt);
-#endif
-
 const char *av_packet_side_data_name(enum AVPacketSideDataType type);
 
 /**
diff --git a/libavcodec/version.h b/libavcodec/version.h
index 31d0d26abc..5e122847ac 100644
--- a/libavcodec/version.h
+++ b/libavcodec/version.h
@@ -84,9 +84,6 @@
 #ifndef FF_API_STRUCT_VAAPI_CONTEXT
 #define FF_API_STRUCT_VAAPI_CONTEXT (LIBAVCODEC_VERSION_MAJOR < 59)
 #endif
-#ifndef FF_API_MERGE_SD_API
-#define FF_API_MERGE_SD_API      (LIBAVCODEC_VERSION_MAJOR < 59)
-#endif
 #ifndef FF_API_TAG_STRING
 #define FF_API_TAG_STRING        (LIBAVCODEC_VERSION_MAJOR < 59)
 #endif
