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• Visual Studio LNK2001 Error, despite using extern "C" for ffmpeg libraries in C++ [duplicate]

  1er février 2020, par Faizan Cassim

  This is what it looks like :

  ’’’

  extern "C"
  
  {
  
  #include "libavcodec/avcodec.h"
  
  #include "libavformat/avformat.h"
  
  #include "libavutil/avutil.h"
  
  };

  ’’’

  But I still get these errors when using the FFmpeg libraries in Visual Studio 2019

  1>AudioFile.obj : error LNK2001: unresolved external symbol avformat_open_input
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_read_frame
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_free
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_get_sample_fmt_name
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol avformat_close_input
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_init_packet
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol avcodec_receive_frame
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol avcodec_open2
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_sample_fmt_is_planar
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol avcodec_close
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_get_bytes_per_sample
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_packet_unref
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol avformat_find_stream_info
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_find_best_stream
  
  1>AudioFile.obj : error LNK2001: unresolved external symbol av_frame_alloc

  I would be greatfull to anyone who could help me resolve this. I am using C++ for Windows.

• Discord.js "Error : FFMPEG not found" but I'm pretty sure I have it

  21 février 2020, par Cole Perry

  I’m learning Discord.js and following this tutorial : https://discord.js.org/#/docs/main/stable/topics/voice . From the start, when I try to run- npm install ffmpeg-binaries I get a huge error message but it tells me to just use install ffmpeg so I did.

  Here is my Index.js page(I’ve replaced my token with * here) :

  const Discord = require('discord.js');
  
  const Colesbot = new Discord.Client();
  
  
  
  const token = '**********************************';
  
  
  
  Colesbot.on('ready', () =>{
  
      console.log('Slamsbot is online.');
  
  })
  
  
  
  Colesbot.on('message', msg=>{
  
     if(msg.content == "What up bot?"){
  
         msg.reply("Whats good pimp?")
  
     }
  
  });
  
  
  
  Colesbot.on('message', message=>{
  
      if (message.content === '/join') {
  
          // Only try to join the sender's voice channel if they are in one themselves
  
          if (message.member.voiceChannel) {
  
              message.member.voiceChannel.join().then(connection => {
  
                  message.reply('I have successfully connected to the channel!');
  
              }).catch(console.log);
  
      } else {
  
          message.reply('You need to join a voice channel first!');
  
        }
  
      }
  
   });
  
  
  
  //Event listener for new guild members
  
  Colesbot.on('guildMemberAdd', member =>{
  
      // Send the message to a designated channel on a server:
  
      const channel = member.guild.channels.find(ch => ch.name === 'general');
  
      // Do nothing if the channel wasn't found on this server
  
      if (!channel) return;
  
      // Send the message, mentioning the member
  
      channel.send(`Welcome to the server, ${member}. Please use the bot-commands channel to assign yourself a role.`);
  
  })
  
  
  
  Colesbot.login(token);
  
  
  
  
  
  
  
  exports.run = (client, message, args) => {
  
  
  
      let user = message.mentions.users.first || message.author;
  
  
  
  
  
  }

  If I type "/join" while not connected to a voice channel I get the proper message. However, if I try while I am I get this error message :

  Error: FFMPEG not found
  
  task_queues.js:94
  
  message:"FFMPEG not found"
  
  stack:"Error: FFMPEG not found\n    at Function.selectFfmpegCommand (c:\Users\bobal\Documents\GitHub\Spotify-Playlist-Discord-bot\node_modules\prism-media\src\transcoders\ffmpeg\Ffmpeg.js:46:13)\n    at new FfmpegTranscoder (c:\Users\bobal\Documents\GitHub\Spotify-Playlist-Discord-bot\node_modules\prism-media\src\transcoders\ffmpeg\Ffmpeg.js:7:37)\n    at new MediaTranscoder (c:\Users\bobal\Documents\GitHub\Spotify-Playlist-Discord-bot\node_modules\prism-media\src\transcoders\MediaTranscoder.js:10:19)\n    at new Prism (c:\Users\bobal\Documents\GitHub\Spotify-Playlist-Discord-bot\node_modules\prism-media\src\Prism.js:5:23)\n    at new VoiceConnection (c:\Users\bobal\Documents\GitHub\Spotify-Playlist-Discord-bot\node_modules\discord.js\src\client\voice\VoiceConnection.js:46:18)\n    at c:\Users\bobal\Documents\GitHub\Spotify-Playlist-Discord-bot\node_modules\discord.js\src\client\voice\ClientVoiceManager.js:63:22\n    at new Promise (<anonymous>)\n    at ClientVoiceManager.joinChannel (c:\Users\bobal\Documents\GitHub\Spotif...
  
  </anonymous>

  So I went to that folder and the file Ffmpeg.js is there and here is its contents :

  const ChildProcess = require('child_process');
  
  const FfmpegProcess = require('./FfmpegProcess');
  
  
  
  class FfmpegTranscoder {
  
    constructor(mediaTranscoder) {
  
      this.mediaTranscoder = mediaTranscoder;
  
      this.command = FfmpegTranscoder.selectFfmpegCommand();
  
      this.processes = [];
  
    }
  
  
  
    static verifyOptions(options) {
  
      if (!options) throw new Error('Options not provided!');
  
      if (!options.media) throw new Error('Media must be provided');
  
      if (!options.ffmpegArguments || !(options.ffmpegArguments instanceof Array)) {
  
        throw new Error('FFMPEG Arguments must be an array');
  
      }
  
      if (options.ffmpegArguments.includes('-i')) return options;
  
      if (typeof options.media === 'string') {
  
        options.ffmpegArguments = ['-i', `${options.media}`].concat(options.ffmpegArguments).concat(['pipe:1']);
  
      } else {
  
        options.ffmpegArguments = ['-i', '-'].concat(options.ffmpegArguments).concat(['pipe:1']);
  
      }
  
      return options;
  
    }
  
  
  
    /**
  
     * Transcodes an input using FFMPEG
  
     * @param {FfmpegTranscoderOptions} options the options to use
  
     * @returns {FfmpegProcess} the created FFMPEG process
  
     * @throws {FFMPEGOptionsError}
  
     */
  
    transcode(options) {
  
      if (!this.command) this.command = FfmpegTranscoder.selectFfmpegCommand();
  
      const proc = new FfmpegProcess(this, FfmpegTranscoder.verifyOptions(options));
  
      this.processes.push(proc);
  
      return proc;
  
    }
  
  
  
    static selectFfmpegCommand() {
  
      try {
  
        return require('ffmpeg-binaries');
  
      } catch (err) {
  
        for (const command of ['ffmpeg', 'avconv', './ffmpeg', './avconv']) {
  
          if (!ChildProcess.spawnSync(command, ['-h']).error) return command;
  
        }
  
        throw new Error('FFMPEG not found');
  
      }
  
    }
  
  }
  
  
  
  module.exports = FfmpegTranscoder;

  I also added ffmpeg to system path and it didn’t help :

  C:\ffmpeg
  
  C:\Users\bobal\Documents\GitHub\Spotify-Playlist-Discord-bot\ffmpeg

  I’m not quite sure what to do from here. If you need any other info I’d be glad to give it.

• permission is denied using Android Q ffmpeg" : error=13, Permission denied

  27 juillet 2022, par v teja

  I want to get the frames from the RTSP video using ffmpeg. But for android 10 above I am getting error as below.

  



   E/FFmpeg: Exception while trying to run: [Ljava.lang.String;@55e447f&#xA;java.io.IOException: Cannot run program "/data/user/0/com.example.downloadimagefromurl/files/ffmpeg": error=13, Permission denied&#xA;    at java.lang.ProcessBuilder.start(ProcessBuilder.java:1050)&#xA;    at java.lang.Runtime.exec(Runtime.java:698)&#xA;    at java.lang.Runtime.exec(Runtime.java:563)&#xA;    at com.github.hiteshsondhi88.libffmpeg.ShellCommand.run(ShellCommand.java:10)&#xA;    at com.github.hiteshsondhi88.libffmpeg.FFmpegExecuteAsyncTask.doInBackground(FFmpegExecuteAsyncTask.java:38)&#xA;    at com.github.hiteshsondhi88.libffmpeg.FFmpegExecuteAsyncTask.doInBackground(FFmpegExecuteAsyncTask.java:10)&#xA;    at android.os.AsyncTask$3.call(AsyncTask.java:378)&#xA;    at java.util.concurrent.FutureTask.run(FutureTask.java:266)&#xA;    at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:289)&#xA;    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)&#xA;    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)&#xA;    at java.lang.Thread.run(Thread.java:919)&#xA; Caused by: java.io.IOException: error=13, Permission denied&#xA;    at java.lang.UNIXProcess.forkAndExec(Native Method)&#xA;    at java.lang.UNIXProcess.<init>(UNIXProcess.java:133)&#xA;</init>

  



  As the answer provided by @Saurabh Thorat, Google doesn't allow apps to run binary files from /data/user directory.

  



  One bad solution that I know is to change compileSdkVersion and targetSdkVersion to 28 or below and re-release my application which is not recommended.

  



  Hence, I am looking for more viable solutions for future releases as well.

  



  Any hint, links or suggestion would be highly appreciated. Thanks in advance.