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• Discord.Net sending audio with ffmpeg only works once (the first time)

  16 janvier 2023, par Esko

  Context :

  


  So I am writing a small bot that should play local audio files on command. I am using Discord.Net, ffmpeg, opus and libsodium.
I have a Speak() function that should, in Theory,

  


  Open ffmpeg -> encode .mp3 -> create PCM stream -> pump the encoded .mp3 to the output(PCM Stream).

  


  That looks like this :

  


  public async Task Speak(IGuild guild, Sound.SoundName soundName)
{
  IAudioClient client;
  if (ConnectedChannels.TryGetValue(guild.Id, out client))
  {
    using (var ffmpeg = CreateStream(sound.Filename))
    using (var stream = client.CreatePCMStream(AudioApplication.Voice, 98304))
    using (var output = ffmpeg.StandardOutput.BaseStream)
    {
     try
     {
       await output.CopyToAsync(stream);                            
     }
     catch (Exception ex) { Console.WriteLine("Error " + ex.Message); Console.WriteLine($"- {ex.StackTrace}"); }
     finally { await stream.FlushAsync(); }
     Console.WriteLine("Spoken!");
   }
}

private Process CreateStream(string _path) 
{
  var process = Process.Start(new ProcessStartInfo
                 {
                   FileName = "ffmpeg",
                   Arguments = $"-hide_banner -loglevel panic -i \"{_path}\" -ac 2 -f s16le -ar 48000 pipe:1",
                   UseShellExecute = false,
                   RedirectStandardOutput = true,
                 });
  return process;
}


  


  And it does this, but only one time. A bit more specific, When my bot joins a Voice Channel, it saves the VoiceChannel ID and the IAudioClient in a private static readonly ConcurrentDictionary ConnectedChannels = new ConcurrentDictionary();. After that it automatically calls the Speak() function to play a hello.mp3 audio. This Process is done like this :

  


  [Command("join", RunMode = RunMode.Async)]
[RequireUserPermission(GuildPermission.MentionEveryone)]
public async Task JoinChannel(IVoiceChannel channel = null) 
{
 // Get the Voice channel
 channel = channel ?? (Context.User as IGuildUser)?.VoiceChannel;
 if (channel == null) { await Context.Channel.SendMessageAsync("You are not in a VoiceChannel"); return; }

 // Saving the AudioClient
 var audioClient = await channel.ConnectAsync();
 Console.WriteLine($"Connected to channel {channel.Name}");

 ConnectedChannels.TryAdd(channel.Guild.Id, audioClient);

 await Task.Delay(1000);
 await Speak(Context.Guild, Sound.SoundName.hello);
}


  


  This works pefectly fine, The audio plays.

  


  Now that the bot is connected to a VoiceChannel and the IAudioClient is saved to the Dictionary. I should be able to call the Speak() function whenever i want and from Whereever i want, as long as the bot is in the VoiceChannel, right ?

  


  No it doesnt.

  


  and that takes me to my
  

  


  Problem :

  


  After the bot is now sitting silently in the voice channel i call a "speak" command that looks in code like this :

  


  [Command("speak")]
public async Task speakSingle() 
{
  await Speak(Context.Guild, Sound.SoundName.Random);
}


  


  But the bot remains silent, even though the speak indicator in Discord lights up ! What am I missing ? I dont get it. Is it sending an empty stream ?
  Even when I disconnect the bot from the VoiceChannel an reconnect it It wont send audio. The only thing that helps is Reconectiong the Bot From the Server.
  I am pretty new to C# and Streams and async programing. So could somebody help me out finding the problem and fix it ?

  


  Errors (CommandPromt Ouput) :

  


  1#
  This occures when i run the "speak" command, im getting a NullReferenceException for "Discord.WebSocket.pdb not loaded" in VisualStudio. Allthough I couldn't find anything thats null...

  


  17:34:17 Audio #1    System.Exception: WebSocket connection was closed&#xA; ---> Discord.Net.WebSocketClosedException: The server sent close 4008: "Rate limited."&#xA;   at Discord.Net.WebSockets.DefaultWebSocketClient.RunAsync(CancellationToken cancelToken)&#xA;   --- End of inner exception stack trace ---&#xA;   at Discord.ConnectionManager.&lt;>c__DisplayClass29_0.&lt;<startasync>b__0>d.MoveNext()&#xA;</startasync>

  


  2#
  This occures when the bot rejoined the Voice Channel and automatically executes the Speak() function.

  


  Error A task was canceled.
-    at Discord.Audio.Streams.BufferedWriteStream.WriteAsync(Byte[] data, Int32 offset, Int32 count, CancellationToken cancelToken)
   at Discord.Audio.Streams.OpusEncodeStream.WriteAsync(Byte[] buffer, Int32 offset, Int32 count, CancellationToken cancelToken)
   at System.IO.Stream.CopyToAsyncInternal(Stream destination, Int32 bufferSize, CancellationToken cancellationToken)
   at Bot.Modules.VoiceChannel.Speak(IGuild guild, SoundName soundName) in Y:\Dokumente\Coding\C#\Vs_Studio\Bot\Bot\Modules\VoiceChannel.cs:line 90


  


  This is my first Question on StackOverflow and i hope i provieded enough context, if not tell me please.

  


• How to quote a file name with a single quote in ffmpeg movie= filter notation ? [closed]

  21 avril, par PieterV

  I am trying to run ffmpeg using a file that contains a single quote ' in the filename.

  


  I tried to follow the docs that say I should replace a ' with '\''.
  
And a ticket that says I should replace a ' with \\\\\'.

  


  I've tried both, and can't get get it working.

  


  E.g. docs format :

  


  ./ffprobe -loglevel error -read_intervals %00:30 -select_streams s:0 -f lavfi -i "movie='D\:\\Test\\Interlaced - Dragons'\'' Den - S14E02 - Episode 2.mkv'[out0+subcc]" -show_packets -print_format json

{
[Parsed_movie_0 @ 00000222a2f82200] Failed to avformat_open_input 'D:\Test\Interlaced - Dragons Den - S14E02 - Episode 2.mkv'
[AVFilterGraph @ 00000222a2f76ec0] Error processing filtergraph: No such file or directory
movie='D\:\\Test\\Interlaced - Dragons'\'' Den - S14E02 - Episode 2.mkv'[out0+subcc]: No such file or directory


  


  E.g. ticket format :

  


  ./ffprobe -loglevel error -read_intervals %00:30 -select_streams s:0 -f lavfi -i "movie='D\:\\Test\\Interlaced - Dragons\\\\\' Den - S14E02 - Episode 2.mkv'[out0+subcc]" -show_packets -print_format json

{
[Parsed_movie_0 @ 00000158613d2080] Failed to avformat_open_input 'D:\Test\Interlaced - Dragons\\ Den - S14E02 - Episode 2.mkv[out0+subcc]'
[AVFilterGraph @ 00000158613c6ec0] Error processing filtergraph: No such file or directory
movie='D\:\\Test\\Interlaced - Dragons\\\\\' Den - S14E02 - Episode 2.mkv'[out0+subcc]: No such file or directory


  


  > dir "D:\Test\Interlaced - Dragons' Den - S14E02 - Episode 2.mkv"

    Directory: D:\Test

Mode                 LastWriteTime         Length Name
----                 -------------         ------ ----
-a---           4/20/2025 11:38 AM       18059051 Interlaced - Dragons' Den - S14E02 - Episode 2.mkv


  


  This is on Win11 using FFmpeg7.
  
Any ideas ?

  


  [Update]
  
I found a doc on escape filtergraph strings, did not help, I tried 0 to 7 \.

  


  I also found and tried the ffescape utility, the output it produces just uses a single \' and does not work.

  


  > echo "D:\Test\Interlaced - Dragons' Den - S14E02 - Episode 2.mkv" | ./ffescape.exe
=> D:\\Test\\Interlaced - Dragons\' Den - S14E02 - Episode 2.mkv\

> ./ffprobe -loglevel error -read_intervals %00:30 -select_streams s:0 -f lavfi -i "movie='D:\\Test\\Interlaced - Dragons\' Den - S14E02 - Episode 2.mkv\'[out0+subcc]" -show_packets -print_format json
{
[Parsed_movie_0 @ 0000021348f12200] Failed to avformat_open_input 'D'
[AVFilterGraph @ 0000021348f06ec0] Error processing filtergraph: No such file or directory
movie='D:\\Test\\Interlaced - Dragons\' Den - S14E02 - Episode 2.mkv\'[out0+subcc]: No such file or directory


  


  [Update]
  
I found docs for ffmpeg filter script where I can place commands in a file.

  


  I tried ./ffprobe -loglevel error -read_intervals %00:01 -select_streams s:0 -f lavfi -/i "d:\filtergraph.txt" -show_packets -print_format json, and it load the script.

  


  Works : movie=test.mkv[out0+subcc]\ if test.mkv is in ffprobe dir.
Works : movie=test\'.mkv[out0+subcc]\ if test'.mkv is in ffprobe dir.
  
Not : movie=D:\test.mkv[out0+subcc]
  
Not : movie=D\:\\test.mkv[out0+subcc]
  
Not : movie=test space.mkv[out0+subcc]
  
Not : movie='test space.mkv[out0+subcc]'
  
Not : movie="test space.mkv[out0+subcc]"
  
Not : 'movie=test space.mkv[out0+subcc]'
  
Not : "movie=test space.mkv[out0+subcc]"

  


   :(

  


• How to dump ALL metadata from a media file, including cover image title ? [closed]

  9 avril, par Unideal

  I have an MP3 song :

  


  # ffprobe -hide_banner -i filename.mp3
Input #0, mp3, from 'filename.mp3':
  Metadata:
    composer        : Music Author
    title           : Song Name
    artist          : Singer
    encoder         : Lavf61.7.100
    genre           : Rock
    date            : 2025
  Duration: 00:03:14.04, start: 0.023021, bitrate: 208 kb/s
  Stream #0:0: Audio: mp3 (mp3float), 48000 Hz, stereo, fltp, 192 kb/s
      Metadata:
        encoder         : Lavc61.19
  Stream #0:1: Video: png, rgb24(pc, gbr/unknown/unknown), 600x600 [SAR 1:1 DAR 1:1], 90k tbr, 90k tbn (attached pic)
      Metadata:
        title           : Cover
        comment         : Cover (front)


  


  The task is to save its metadata to a text file and restore from that file later. Both goals should be accomplished with ffmpeg.

  


  The simpliest method is to run :

  


  # ffmpeg -i filename.mp3 -f ffmetadata metadata.txt


  


  After that, metadata.txt contains :

  


  ;FFMETADATA1
composer=Music Author
title=Song Name
artist=Singer
date=2025
genre=Rock
encoder=Lavf61.7.100


  


  I got global metadata only, but stream-specific info (cover image title and comment in my case) are missing.

  


  Google suggested a more complex form of the command above to extract all metadata fields without any exclusions :

  


  # ffmpeg -y -i filename.mp3 -c copy -map_metadata 0 -map_metadata:s:v 0:s:v -map_metadata:s:a 0:s:a -f ffmetadata metadata.txt


  


  But the output is exactly the same :

  


  ;FFMETADATA1
composer=Music Author
title=Song Name
artist=Singer
date=2025
genre=Rock
encoder=Lavf61.7.100


  


  Again, no info about the attached image.

  


  Please explain what am I doing wrong.