[FFmpeg-trac] #7606(avformat:new): ffmpeg 4.0.2 and above missing 'ffio_open_dyn_packet_buf' from avformat.lib & avformat.dll

[FFmpeg]

#7606: ffmpeg 4.0.2 and above missing 'ffio_open_dyn_packet_buf' from avformat.lib
& avformat.dll
-------------------------------------+-------------------------------------
             Reporter:               |                     Type:  defect
  dinesh.gupta01                     |                 Priority:  normal
               Status:  new          |                  Version:  git-
            Component:  avformat     |  master
             Keywords:               |               Blocked By:
  ffio_open_dyn_packet_buf           |  Reproduced by developer:  0
             Blocking:               |
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 While building 'ffmpeg' 4.0.2 and above, missing function
 'ffio_open_dyn_packet_buf'. Due to this I am unable to compile my project.
 I spend my whole week to find the solution but didn't get success. When
 searching this function in code than it is available on source code.But
 when build from sorce code this function is missing. Please guide me what
 I need to do.

         ./libavformat/aviobuf.c:1396:int
 ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size)
         ./libavformat/avio_internal.h:120:int
 ffio_open_dyn_packet_buf(AVIOContext **s, int max_packet_size);
         ./libavformat/movenchint.c:430:    if ((ret =
 ffio_open_dyn_packet_buf(&rtp_ctx->pb,
         ./libavformat/rtpenc_chain.c:85:        ret =
 ffio_open_dyn_packet_buf(&rtpctx->pb, packet_size);
         ./libavformat/rtspenc.c:158:         * ffio_open_dyn_packet_buf.
 So by writing the interleaving header
         ./libavformat/rtspenc.c:178:    return
 ffio_open_dyn_packet_buf(&rtpctx->pb, RTSP_TCP_MAX_PACKET_SIZE);


 I have below environment:
 OS : Windows 10
 MSVC : Visual Studio 15 with Windows SDK 10.0.17763.0
 MSYS2 : MINGW32_NT-10.0-WOW

 Getting below error:
         server-ffmpeg.obj : error LNK2019: unresolved external symbol
 _ffio_open_dyn_packet_buf referenced in function "int __cdecl
 ff_server_send_packet_1(char const *,void *,int,struct AVPacket
 *,__int64,struct timeval *)"
 (?ff_server_send_packet_1@@YAHPBDPAXHPAUAVPacket@@_JPAUtimeval@@@Z)
                 rtspserver.obj : error LNK2019: unresolved external symbol
 _ff_rtsp_parse_line referenced in function "void * __cdecl rtspserver(void
 *)" (?rtspserver@@YAPAXPAX at Z)
                 server-ffmpeg.dll : fatal error LNK1120: 1 unresolved
 externals

 Please guild me to achieve above result.

 Thanks

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Ticket URL: <https://trac.ffmpeg.org/ticket/7606>
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