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• Can't link FFMPEG dynamically to VS 2019 project

  10 février 2021, par Maya Sela

  I downloaded the source code of FFMPEG 3.4.8 and built with MSVC as such :
  
After unzipping, open x86_x64 Cross Tools Command Prompt for VS 2019 and run msys2_shell.cmd. From there, run
  
./configure --toolchain=msvc --arch=x86_64 --enable-yasm --enable-asm --enable-shared --disable-static
and
make

  
I then created a new project in VS 2019.
  
In Properties > C/C++ > General > Additional Include Directories :
  
(Where all the headers are)

  


  E:\ffmpeg-3.4.8\libavutil
E:\ffmpeg-3.4.8\libavcodec
E:\ffmpeg-3.4.8\libavdevice
E:\ffmpeg-3.4.8\libavfilter
E:\ffmpeg-3.4.8\libavresample
E:\ffmpeg-3.4.8\libpostproc
E:\ffmpeg-3.4.8\libswscale
E:\ffmpeg-3.4.8\libswresample
E:\ffmpeg-3.4.8\libavformat


  


  In Properties > Linker > General > Additional Library Directories :
  
(Where the .lib files are)

  


  E:\ffmpeg-3.4.8\libavutil
E:\ffmpeg-3.4.8\libavcodec
E:\ffmpeg-3.4.8\libavdevice
E:\ffmpeg-3.4.8\libavfilter
E:\ffmpeg-3.4.8\libavresample
E:\ffmpeg-3.4.8\libpostproc
E:\ffmpeg-3.4.8\libswscale
E:\ffmpeg-3.4.8\libswresample
E:\ffmpeg-3.4.8\libavformat


  


  In Properties > Linker > Input > Additional Dependencies :

  


  avcodec.lib
avdevice.lib
avfilter.lib
avformat.lib
swresample.lib
swscale.lib


  


  For good measure, I copied the .dll files of each library to the Release folder of the project. There is one source file I am trying to build and run :

  


  &#xA;extern "C" {&#xA;#include <libavformat></libavformat>avformat.h>&#xA;}&#xA;&#xA;int main() {&#xA;    AVFormatContext* pFormatContext = avformat_alloc_context();&#xA;}&#xA;

  


  The result is as follows :

  


  1>------ Build started: Project: FFMPEG_example, Configuration: Release x64 ------
1>Source.cpp
1>Source.obj : error LNK2001: unresolved external symbol avformat_alloc_context
1>C:\Users\maya.s\source\repos\FFMPEG_example\x64\Release\FFMPEG_example.exe : fatal error LNK1120: 1 unresolved externals
1>Done building project "FFMPEG_example.vcxproj" -- FAILED.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========


  


  Does anyone have an idea ?
  
Thanks !

  


• Cannot link an application with libavcodec

  25 mars 2020, par Igor Evdokimov

  I’m trying to make a simplest app with usage of ffmpeg libs.
  Here is my code :

  main.c :

  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  #include <libswscale></libswscale>swscale.h>
  
  
  
  int main()
  
  {
  
  
  
      avformat_network_init();
  
      return 0;
  
  }

  compiler command :

  gcc -o main main.c -Wall  -lavformat -lavcodec -lswresample -lswscale -lavutil -lm -lz -lpthread -L/usr/local/lib/

  leads to :

  /usr/local/lib//libavformat.a(matroskaenc.o) : In function

  get_aac_sample_rates':
 /home/ievdokimov/repos/FFmpeg/libavformat/matroskaenc.c:709: undefined
 reference to

  avpriv_mpeg4audio_get_config2’
  /home/ievdokimov/repos/FFmpeg/libavformat/matroskaenc.c:709 : undefined
  reference to

  avpriv_mpeg4audio_get_config2'
 /usr/local/lib//libavformat.a(mux.o): In function
 

  ff_interleave_add_packet’ :
  /home/ievdokimov/repos/FFmpeg/libavformat/mux.c:936 : undefined
  reference to

  av_packet_make_refcounted'
 /usr/local/lib//libavformat.a(utils.o): In function
 

  ff_packet_list_put’ :
  /home/ievdokimov/repos/FFmpeg/libavformat/utils.c:461 : undefined
  reference to

  av_packet_make_refcounted'
 /usr/local/lib//libavformat.a(utils.o): In function

  parse_packet’ :
  /home/ievdokimov/repos/FFmpeg/libavformat/utils.c:1494 : undefined
  reference to

  av_packet_make_refcounted'
 /usr/local/lib//libavformat.a(utils.o): In function

  ff_read_packet’ :
  /home/ievdokimov/repos/FFmpeg/libavformat/utils.c:876 : undefined
  reference to

  av_packet_make_refcounted'
 /usr/local/lib//libavformat.a(codec2.o): In function
 

  codec2_read_header_common’ :
  /home/ievdokimov/repos/FFmpeg/libavformat/codec2.c:74 : undefined
  reference to

  avpriv_codec2_mode_bit_rate'
 /home/ievdokimov/repos/FFmpeg/libavformat/codec2.c:75: undefined
 reference to

  avpriv_codec2_mode_frame_size’
  /home/ievdokimov/repos/FFmpeg/libavformat/codec2.c:76 : undefined
  reference to

  avpriv_codec2_mode_block_align'
 /home/ievdokimov/repos/FFmpeg/libavformat/codec2.c:74: undefined
 reference to

  avpriv_codec2_mode_bit_rate’
  /home/ievdokimov/repos/FFmpeg/libavformat/codec2.c:75 : undefined
  reference to

  avpriv_codec2_mode_frame_size'
 /home/ievdokimov/repos/FFmpeg/libavformat/codec2.c:76: undefined
 reference to

  avpriv_codec2_mode_block_align’
  /usr/local/lib//libavformat.a(isom.o) : In function

  ff_mp4_read_dec_config_descr':
 /home/ievdokimov/repos/FFmpeg/libavformat/isom.c:552: undefined
 reference to

  avpriv_mpeg4audio_get_config2’
  /usr/local/lib//libavformat.a(latmenc.o) : In function

  latm_decode_extradata':
 /home/ievdokimov/repos/FFmpeg/libavformat/latmenc.c:65: undefined
 reference to

  avpriv_mpeg4audio_get_config2’
  /home/ievdokimov/repos/FFmpeg/libavformat/latmenc.c:65 : undefined
  reference to

  avpriv_mpeg4audio_get_config2'
 /usr/local/lib//libavformat.a(matroskadec.o): In function
 

  matroska_decode_buffer’ :
  /home/ievdokimov/repos/FFmpeg/libavformat/matroskadec.c:1657 :
  undefined reference to

  BZ2_bzDecompressInit'
 /home/ievdokimov/repos/FFmpeg/libavformat/matroskadec.c:1672:
 undefined reference to

  BZ2_bzDecompress’
  /home/ievdokimov/repos/FFmpeg/libavformat/matroskadec.c:1665 :
  undefined reference to

  BZ2_bzDecompressEnd'
 /home/ievdokimov/repos/FFmpeg/libavformat/matroskadec.c:1675:
 undefined reference to

  BZ2_bzDecompressEnd’
  /usr/local/lib//libavformat.a(mxfenc.o) : In function

  get_ue_golomb_31':
 /home/ievdokimov/repos/FFmpeg/./libavcodec/golomb.h:140: undefined
 reference to

  ff_ue_golomb_vlc_code’
  /usr/local/lib//libavformat.a(mxfenc.o) : In function

  mxf_parse_dnxhd_frame':
 /home/ievdokimov/repos/FFmpeg/libavformat/mxfenc.c:2030: undefined
 reference to

  avpriv_dnxhd_get_hr_frame_size’
  /usr/local/lib//libavformat.a(rtpenc_vc2hq.o) : In function

  init_get_bits_xe':
 /home/ievdokimov/repos/FFmpeg/./libavcodec/get_bits.h:628: undefined
 reference to

  ff_interleaved_golomb_vlc_len’
  /usr/local/lib//libavformat.a(rtpenc_vc2hq.o) : In function

  get_interleaved_ue_golomb':
 /home/ievdokimov/repos/FFmpeg/./libavcodec/golomb.h:197: undefined
 reference to

  ff_interleaved_dirac_golomb_vlc_code’
  /home/ievdokimov/repos/FFmpeg/./libavcodec/golomb.h:185 : undefined
  reference to

  ff_interleaved_dirac_golomb_vlc_code'
 /home/ievdokimov/repos/FFmpeg/./libavcodec/golomb.h:197: undefined
 reference to

  ff_interleaved_dirac_golomb_vlc_code’
  /home/ievdokimov/repos/FFmpeg/./libavcodec/golomb.h:197 : undefined
  reference to

  ff_interleaved_dirac_golomb_vlc_code'
 /home/ievdokimov/repos/FFmpeg/./libavcodec/golomb.h:185: undefined
 reference to

  ff_interleaved_dirac_golomb_vlc_code’
  /usr/local/lib//libavformat.a(rtpenc_vc2hq.o) :/home/ievdokimov/repos/FFmpeg/./libavcodec/golomb.h:185 :
  more undefined references to

  ff_interleaved_dirac_golomb_vlc_code'
 follow /usr/local/lib//libavformat.a(rtpenc_vc2hq.o): In function
 

  get_interleaved_ue_golomb’ :
  /home/ievdokimov/repos/FFmpeg/./libavcodec/golomb.h:183 : undefined
  reference to

  ff_interleaved_ue_golomb_vlc_code'
 /home/ievdokimov/repos/FFmpeg/./libavcodec/golomb.h:183: undefined
 reference to

  ff_interleaved_ue_golomb_vlc_code’
  /home/ievdokimov/repos/FFmpeg/./libavcodec/golomb.h:183 : undefined
  reference to

  ff_interleaved_ue_golomb_vlc_code'
 /usr/local/lib//libavformat.a(spdifdec.o): In function
 

  spdif_get_offset_and_codec’ :
  /home/ievdokimov/repos/FFmpeg/libavformat/spdifdec.c:63 : undefined
  reference to

  av_adts_header_parse'
 /home/ievdokimov/repos/FFmpeg/libavformat/spdifdec.c:63: undefined
 reference to

  av_adts_header_parse’
  /usr/local/lib//libavformat.a(spdifenc.o) : In function

  spdif_header_aac':
 /home/ievdokimov/repos/FFmpeg/libavformat/spdifenc.c:362: undefined
 reference to

  av_adts_header_parse’
  /usr/local/lib//libavformat.a(ac3dec.o) : In function

  ac3_eac3_probe':
 /home/ievdokimov/repos/FFmpeg/libavformat/ac3dec.c:63: undefined
 reference to

  av_ac3_parse_header’
  /home/ievdokimov/repos/FFmpeg/libavformat/ac3dec.c:60 : undefined
  reference to

  av_ac3_parse_header'
 /usr/local/lib//libavformat.a(adtsenc.o): In function
 

  adts_decode_extradata’ :
  /home/ievdokimov/repos/FFmpeg/libavformat/adtsenc.c:56 : undefined
  reference to `avpriv_mpeg4audio_get_config2’ collect2 : error : ld
  returned 1 exit status

  Is there any way to fix that ?

• Cannot play audio from a link using a Discord Bot

  2 mars 2020, par Guilhermeffable

  I’m trying to code a bot so me and my friends can hear the local radio on our Discord Server but I’m having this error.

  This is part of my code, it’s the play.js file that handles the playback stuff.

  module.exports = (client,message) => {
  
  
  
  const voiceChannel = message.member.voiceChannel;
  
  const idChannel = voiceChannel.id;
  
  
  
  console.log(idChannel)
  
      //vê se o user está numa sala de voz
  
  if(!voiceChannel) {
  
      return message.channel.send("Precisas de estar num voice channel para usar este comando.")
  
  }
  
  const permissions = voiceChannel.permissionsFor(message.client.user);
  
  
  
   //vê se tem permissões para entrar na sala
  
  if(!permissions.has('CONNECT') || !permissions.has('SPEAK')) {
  
      return message.channel.send("Não tenho permissões para entrar nessa sala.")
  
  }
  
  
  
  voiceChannel.join()
  
      .then(connection => {
  
          console.log("Successfully connected.");
  
          connection.playStream('http://centova.radios.pt:8401/stream.mp3/1')
  
  }).catch(e =>{
  
      console.error(e);
  
  
  
  });

  }

  And this is the error I’m getting :

  TypeError [ERR_INVALID_ARG_TYPE]: The "file" argument must be of type string. Received an instance of         
  
  Object
  
  at validateString (internal/validators.js:117:11)
  
  at normalizeSpawnArguments (child_process.js:406:3)
  
  at Object.spawn (child_process.js:542:16)
  
  at new FfmpegProcess (C:\Users\guilh\desktop\BOT\orbitalbot\node_modules\prism-media\src\transcoders\ffmpeg\FfmpegProcess.js:14:33)
  
  at FfmpegTranscoder.transcode (C:\Users\guilh\desktop\BOT\orbitalbot\node_modules\prism-media\src\transcoders\ffmpeg\Ffmpeg.js:34:18)
  
  at MediaTranscoder.transcode (C:\Users\guilh\desktop\BOT\orbitalbot\node_modules\prism-media\src\transcoders\MediaTranscoder.js:27:31)
  
  at Prism.transcode (C:\Users\guilh\desktop\BOT\orbitalbot\node_modules\prism-media\src\Prism.js:13:28)
  
  at AudioPlayer.playUnknownStream (C:\Users\guilh\desktop\BOT\orbitalbot\node_modules\discord.js\src\client\voice\player\AudioPlayer.js:97:35)
  
  at VoiceConnection.playStream (C:\Users\guilh\desktop\BOT\orbitalbot\node_modules\discord.js\src\client\voice\VoiceConnection.js:546:24)
  
  at C:\Users\guilh\desktop\BOT\orbitalbot\commands\play.js:24:24 {
  
    code: 'ERR_INVALID_ARG_TYPE'