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• How to create a queue system with a discord.py bot

  20 août 2024, par Zamv

  I'm trying to create a bot with discord.py.

  


  Also, I'm a beginner, so I'll be interested in what I can improve and any errors there are.

  


  I've been stuck on trying to create this queue system for songs, the bot was working perfectly fine and played some urls before I implemented the play_next function. Now it doesn't even play the first song, even if it sends confirmation messages both in the terminal that in the discord channel. I know that the code might be a little confusing.

  


  I wrote two main functions : "play_next" to play the next song in the queue and "play", the main command. Here is my play_next function :

  


  async def play_next(self,ctx):
        if not ctx.voice_client.is_playing: #(don't know if this is correct as I also check if the bot isn't                     playing anything in the play function)
            
            if self.song.queue: 
                next_song = self.song_queue.pop(0) #deleting the first element of the queue, so if we have (song_0, song_1 and song_2) the bot should delete (song_0) making in fact song_1 the "next" song_0
                try:
                    ctx.voice_client.play(discord.FFmpegPCMAudio(next_song), 
                                          after=lambda e: self.bot.loop.create_task(self.play_next(ctx))) #Not gonna lie here, i asked chat gpt for this line, it should make the bot automatically play the next song one after another, correct me if I am wrong

#this is not important
                    embed = discord.Embed(
                        title="Song",
                        description=f"Now playing {next_song}",
                        color = 0x1DB954
                    )
                    await ctx.send(embed=embed)
                except Exception as e:
                    print(f"Error playing the next song: {e}")

            else:
                await ctx.voice_client.disconnect()  # disconnecting from the voice channel if the queue is empty
                print("Disconnected from the voice channel as the queue is empty.")


  


  I think that the main problem of my bot is the play_next function, but here it is my "play" function :

  


      @commands.command(pass_context=True)
    async def play(self, ctx, url: str):  
        if ctx.author.voice:  # first checking if the user is in a voice channel
            if not ctx.voice_client: #then checking if the bot is already connected to a voice channel
                channel = ctx.message.author.voice.channel 
                try:
                    await channel.connect()  #then joining
                    print("I joined the voice channel!")
                except Exception as e:
                    print(f"Failed to connect to the voice channel: {e}")
                    return

            song_path = f"song_{self.song_index}.mp3" #note, im using cogs, i declared self.song_index with the value of 0 
            self.song_index += 1 #i thought that this was the easiest way of creating a new file for each song

            ydl_opts = {
                'format': 'bestaudio/best',
                'postprocesors': [{
                    'key': 'FFmpegExtractAudio',
                    'preferredcodec': 'mp3',
                    'preferredquality': '192',
                }],
                'outtmpl': song_path
            }
            try:
                with youtube_dl.YoutubeDL(ydl_opts) as ydl:
                    print("Starting download...")
                    ydl.download([url]) #this is where it should download the song provided by the url
                    print("Download finished.")
            except Exception as e:
                await ctx.send(f"Failed to download the song: {e}")
                return

#i think that the next two if statements are the main threats
            if os.path.exists(song_path): #if there is atleast 1 song in the queue
                self.song_queue.append(song_path) #append the next one
                embed = discord.Embed(
                    title="Added to Queue!",
                    description = f"{url} has been added to the queue.",
                    color=0x33ff33
                )
                await ctx.send(embed=embed)


                if not ctx.voice_client.is_playing(): #checking if the bot is already playing something, don't know if i should put this if statement here
                    print("Starting playback...")
                    await self.play_next(ctx) #if nothing is playing, then the bot should play the next song



            else:
                await ctx.send("Failed to download or find the audio file.")

        else:
            embed = discord.Embed(
                title="❌You must be in a voice channel",
                color=0xff6666
            )
            await ctx.send(embed=embed)


  


• want ffmpeg to capture only system sounds (no microphone) [closed]

  11 avril 2021, par josh joyer

  How to make ffmpeg to capture only system sounds (no microphone) ?
https://cdtjyku.blogspot.com/2019/04/ffmpeg-how-to-merge-gdigrab-and-audio.html
In above link reads that command

  


  ffmpeg -f f32le -ac 2 -ar 44.1k -i \.pipesystemAudioPipe


  


  should provide with only system audio sounds.
It might well work on linux but how to do that on windows ?

  


• Improper use of system() call ?

  28 mai 2013, par Dima1982

  I have a particle system program that generates a .dat file with particle coordinates in every iteration. The end goal is to run the program multiple times via a script with different parameters. So, I am trying to setup my program in a way that, for every run, all relevant data are going to be stored in a folder.

  What I do is to generate PNGs from the .dat files with Gnuplot, call ffmpeg to create a video out of the PNGs, use WinRAR to compress the .dat files and finally clean up, by deleting all the intermediate files. This works, when I do it in the working directory.

  Now I try to create a new directory and do the same stuff in there. My code :

  // Load the proper library to use chdir() function
  
  #ifdef _WIN32
  
  #include 
  
  #elif defined __linux__ || defined __APPLE__&&__MACH__
  
  #include 
  
  #endif
  
  
  
  // Make output directory and change working directory to new directory
  
      ostringstream dirCommand;
  
      dirCommand << "mkdir " << folderName_str;
  
      system(dirCommand.str().c_str());
  
      const char* test  = folderName_str.c_str();
  
      #ifdef _WIN32
  
          if(_chdir(test))
  
          {
  
              printf( "Unable to locate the directory: %s\n",test);
  
              return;
  
          }
  
      #elif defined __linux__ || defined __APPLE__&&__MACH__
  
          if(chdir(test))
  
          {
  
              printf( "Unable to locate the directory: %s\n",test);
  
              return;
  
          }
  
      #endif
  
          else
  
              printf("Created output directory...\n");

  Already for this part, I know that there are going to be objections. I have looked extensively on SO and many people favor SetCurrentDirectory() for Windows, or they are skeptical about using system(). In my defense, I am a novice programmer and my knowledge is really limited...

  Now, when I try to make the video with FFMpeg and then rar/tar my files :

  // Make video
  
          std::cout << "Generating Video..." << endl;
  
          ostringstream command;
  
          command << "ffmpeg -f image2 -r 1/0.1 -i output_%01d.png -vcodec mpeg4 " << videoName_str << ".avi -loglevel quiet";
  
          std::system(command.str().c_str());
  
  
  
          // Clean Up!
  
          std::cout << "Cleaning up!" << endl;
  
          ostringstream command2;
  
          #ifdef _WIN32
  
              command2 << "rar -inul a " << videoName_str << ".rar *.dat settings.gp loadfile.gp";
  
          #elif defined __linux__ || defined __APPLE__&&__MACH__
  
              command2 << "tar cf " << videoName_str << ".tar *.dat settings.gp loadfile.gp";
  
          #endif
  
          std::system(command2.str().c_str());

  I get very different behaviors in Win/ Linux.

  Win 7 x64, Visual Studio 2010/12

  In windows, the folder is created. The .dat files are generated correctly and gnuplot plots the PNGs as well. When ffmpeg is called, nothing happens. No error message from FFMpeg or anything. The same goes for WinRAR. Maybe, for the last thing, I can use the command line utility of 7z which is free !

  Linux Mint 14 x64, Qt 4.8.1

  Strangely enough, the behavior is inverted from that of Windows. As soon as the dir is changed, only the first .dat file is generated. It is as if every subsequent call I make to fprintf() for my file generation does not work, or gets lost somewhere. Gnuplot works, as do ffmpeg and tar !!

  I am really perplexed. Any help, would be really appreciated.