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• Discord bot returning odd error message and not playing sound

  26 février 2020, par Ravenr_

  I am attempting to create a function of my discord bot that will join your voice channel then play something from youtube as specified in the command

  i.e. $play <youtube link="link"></youtube>

  The problem is that my bot joins the voice channel but doesn’t play any sound and outputs an error to the console that I dont know how to fix

  My Code :

  const ytdl = require("ytdl-core");
  
  module.exports = {
  
      name: 'play',
  
      description: 'initiates music methods of the bot',
  
      execute(msg, args){
  
          var servers = {};
  
  
  
          function play(connection, msg){
  
              var server = servers[msg.guild.id];
  
  
  
              server.dispatcher = connection.playStream(ytdl(server.queue[0], {filter: "audioonly"}));
  
              server.queue.shift();
  
  
  
              server.dispatcher.on("end", function(){
  
                  if(server.queue[0]){
  
                      play(connection, msg);
  
                  }else{
  
                      connection.disconnect();
  
                  }
  
              });
  
  
  
  
  
          }
  
          if(!args[1]){
  
              return msg.channel.send("you need to provide a link");
  
          } 
  
          if(!msg.member.voiceChannel){
  
              return msg.channel.send("You must be in a voice channel to use this feature");
  
          }
  
          if(!servers[msg.guild.id]) servers[msg.guild.id] = {
  
              queue: []
  
          }
  
          var server = servers[msg.guild.id];
  
          server.queue.push(args[1]);
  
          if(!msg.guild.voiceConnection) msg.member.voiceChannel.join().then(function(connection){
  
              play(connection, msg);
  
          })
  
      }
  
  }

  The Error :

  2020-02-26T16:31:59.458215+00:00 app[worker.1]: (node:4) UnhandledPromiseRejectionWarning: TypeError [ERR_INVALID_ARG_TYPE]: The "file" argument must be of type string. Received an instance of Object
  
  2020-02-26T16:31:59.458223+00:00 app[worker.1]:     at validateString (internal/validators.js:117:11)
  
  2020-02-26T16:31:59.458224+00:00 app[worker.1]:     at normalizeSpawnArguments (child_process.js:406:3)
  
  2020-02-26T16:31:59.458224+00:00 app[worker.1]:     at Object.spawn (child_process.js:542:16)
  
  2020-02-26T16:31:59.458225+00:00 app[worker.1]:     at new FfmpegProcess (/app/node_modules/prism-media/src/transcoders/ffmpeg/FfmpegProcess.js:14:33)
  
  2020-02-26T16:31:59.458225+00:00 app[worker.1]:     at FfmpegTranscoder.transcode (/app/node_modules/prism-media/src/transcoders/ffmpeg/Ffmpeg.js:34:18)
  
  2020-02-26T16:31:59.458226+00:00 app[worker.1]:     at MediaTranscoder.transcode (/app/node_modules/prism-media/src/transcoders/MediaTranscoder.js:27:31)
  
  2020-02-26T16:31:59.458226+00:00 app[worker.1]:     at Prism.transcode (/app/node_modules/prism-media/src/Prism.js:13:28)
  
  2020-02-26T16:31:59.458227+00:00 app[worker.1]:     at AudioPlayer.playUnknownStream (/app/node_modules/discord.js/src/client/voice/player/AudioPlayer.js:97:35)
  
  2020-02-26T16:31:59.458231+00:00 app[worker.1]:     at VoiceConnection.playStream (/app/node_modules/discord.js/src/client/voice/VoiceConnection.js:478:24)
  
  2020-02-26T16:31:59.458232+00:00 app[worker.1]:     at play (/app/commands/play.js:11:44)

  for reference these are the links I tested it with 1 & 2

  I’m not sure how to make queue[0] a string, which is what I assume the problem is.

  I was thinking of using a toString() i.e. server.queue[0].toString() but I think that will just return the memory address.

  If anyone can help me know what the issue is or how to fix it, that would be great.

• Removing one audio track from a movie results in audio desync when copying, but not when reencoding --- why ?

  18 avril 2020, par chsk

  I'm trying to remove a superfluous audio track from a movie file. Specifically, this movie on archive.org has the original audio as track 2, and what appears to be a slavic (Russian ?) voiceover in track 1. I'd like to get rid of the latter.

  



  I found this question that suggested I should do the following :

  



  ffmpeg -i Benjamín\ dúfa.avi -map 0 -map -0:a:0 -c copy Benjamín\ dúfa\ \(aðeins\ íslenskt\ tal\).avi

  



  But this doesn't work : after removing the first audio track, audio and video are not in sync in the resulting file anymore (when played in VLC). Now, I was able to overcome this problem by also reencoding the remaining audio track along the way, using

  



  ffmpeg -i Benjamín\ dúfa.avi -map 0 -map -0:a:0 -c:v copy Benjamín\ dúfa\ \(aðeins\ íslenskt\ tal\).avi

  



  But while this works, I'd like to understand why copying the audio track instead does not. I suppose it's a somewhat philosophical question --- consider it a matter of intellectual curiosity, combined with an aversion to needless lossy re-encoding.

  



  So if anyone can explain this to me, I'd very grateful. Thanks !

  



  EDIT : as per Gyan's request, here's ffmpeg's output for the first command :

  



  ffmpeg version 4.2 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 9.1.1 (GCC) 20190807
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, avi, from 'Benjam├¡n d├║fa.avi':
  Metadata:
    encoder         : VirtualDubModRus 1.5.10.2 (build 2542/release)
    IAS1            : Islenska
  Duration: 01:27:37.00, start: 0.000000, bitrate: 1313 kb/s
    Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 720x400 [SAR 1:1 DAR 9:5], 979 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
    Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, fltp, 192 kb/s
    Stream #0:2: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, fltp, 128 kb/s
Output #0, avi, to 'b.avi':
  Metadata:
    IAS1            : Islenska
    ISFT            : Lavf58.29.100
    Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 720x400 [SAR 1:1 DAR 9:5], q=2-31, 979 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
    Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, fltp, 128 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:2 -> #0:1 (copy)
Press [q] to stop, [?] for help
[avi @ 0000000002bf00c0] Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
frame=131425 fps=7616 q=-1.0 Lsize=  718952kB time=01:27:37.00 bitrate=1120.3kbits/s speed= 305x
video:628523kB audio:82141kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.166227%


  



  And also for the second, for comparison :

  



  ffmpeg version 4.2 Copyright (c) 2000-2019 the FFmpeg developers
  built with gcc 9.1.1 (GCC) 20190807
  configuration: --enable-gpl --enable-version3 --enable-sdl2 --enable-fontconfig --enable-gnutls --enable-iconv --enable-libass --enable-libdav1d --enable-libbluray --enable-libfreetype --enable-libmp3lame --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopus --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libtheora --enable-libtwolame --enable-libvpx --enable-libwavpack --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libzimg --enable-lzma --enable-zlib --enable-gmp --enable-libvidstab --enable-libvorbis --enable-libvo-amrwbenc --enable-libmysofa --enable-libspeex --enable-libxvid --enable-libaom --enable-libmfx --enable-amf --enable-ffnvcodec --enable-cuvid --enable-d3d11va --enable-nvenc --enable-nvdec --enable-dxva2 --enable-avisynth --enable-libopenmpt
  libavutil      56. 31.100 / 56. 31.100
  libavcodec     58. 54.100 / 58. 54.100
  libavformat    58. 29.100 / 58. 29.100
  libavdevice    58.  8.100 / 58.  8.100
  libavfilter     7. 57.100 /  7. 57.100
  libswscale      5.  5.100 /  5.  5.100
  libswresample   3.  5.100 /  3.  5.100
  libpostproc    55.  5.100 / 55.  5.100
Input #0, avi, from 'Benjam├¡n d├║fa.avi':
  Metadata:
    encoder         : VirtualDubModRus 1.5.10.2 (build 2542/release)
    IAS1            : Islenska
  Duration: 01:27:37.00, start: 0.000000, bitrate: 1313 kb/s
    Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 720x400 [SAR 1:1 DAR 9:5], 979 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
    Stream #0:1: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, fltp, 192 kb/s
    Stream #0:2: Audio: mp3 (U[0][0][0] / 0x0055), 48000 Hz, stereo, fltp, 128 kb/s
Stream mapping:
  Stream #0:0 -> #0:0 (copy)
  Stream #0:2 -> #0:1 (mp3 (mp3float) -> mp3 (libmp3lame))
Press [q] to stop, [?] for help
Output #0, avi, to 'b2.avi':
  Metadata:
    IAS1            : Islenska
    ISFT            : Lavf58.29.100
    Stream #0:0: Video: mpeg4 (Advanced Simple Profile) (XVID / 0x44495658), yuv420p, 720x400 [SAR 1:1 DAR 9:5], q=2-31, 979 kb/s, 25 fps, 25 tbr, 25 tbn, 25 tbc
    Stream #0:1: Audio: mp3 (libmp3lame) (U[0][0][0] / 0x0055), 48000 Hz, stereo, fltp
    Metadata:
      encoder         : Lavc58.54.100 libmp3lame
[avi @ 00000000004b7440] Timestamps are unset in a packet for stream 0. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
frame=131425 fps=1090 q=-1.0 Lsize=  718952kB time=01:27:37.00 bitrate=1120.3kbits/s speed=43.6x
video:628523kB audio:82141kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: 1.166233%


  


• Exoplayer FFMPEG issue. Video froze on the first frame after adding Exoplayer FFMPEG extension

  13 mai 2020, par Aravind

  I am working on adding Exoplayer and it works fine. But some of the videos were playing without audio, it plays fine in VLC medial player. So I was suggested to add Exoplayer FFMPEG. I added Exoplayer FFMPEG extension and I modified the code as below,

  



  val videoTrackSelectionFactory: TrackSelection.Factory = AdaptiveTrackSelection.Factory(BANDWIDTH_METER)
val trackSelector: TrackSelector = DefaultTrackSelector(videoTrackSelectionFactory)

val renderersFactory: RenderersFactory = DefaultRenderersFactory(mContext, null, EXTENSION_RENDERER_MODE_PREFER)
mPlayer = ExoPlayerFactory.newSimpleInstance(mContext, renderersFactory, trackSelector)
mediaSource = mMediaSourceUri?.let { createLeafMediaSource(it) }!!
mPlayer.prepare(mediaSource)


  



  After I modified the video stuck with the first frame and it keeps on loading. I checked the log and I didn't see any error.

  



  

  



  Can anyone help me with this ? Thanks in advance !