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• How to generate ultrasound through ffmpeg ?

  5 mai 2022, par aszswaz

  I'm learning ffmpeg recently, and in the process, I thought of a question, can ffmpeg generate ultrasonic and infrasound waves ?

  


  If so, is it possible to see the spectrum of ultrasonic or infrasound through ffplay ?

  


• How to use nodejs to generate m3u8 file ?

  13 février 2024, par qiaoshouzi

  How can I generate an m3u8 file ?

  


  I want to use Node.js to generate an m3u8 file, but not by directly using the ffmpeg command (ffmpeg -i xxx -f hls index.m3u8).

  


  Even when I add the -hls_time 10 parameter, I've noticed that the duration of each segment in the m3u8 file generated by ffmpeg is not consistently 10 seconds, so I can't simply write #EXTINF:10.

  


  From my research, it seems this inconsistency is related to I-frames. I've attempted to use ffprobe to retrieve the I-frames of the video, but I haven't received any output data.

  


  ffprobe -v error -skip_frame nokey -select_streams v:0 -show_entries frame=pkt_pts_time -of csv=print_section=0 xxx.mkv

  


  I'm using a .mkv file and would appreciate some assistance.

  


• When I try to play my Music Discord Bot it doesn't play music

  1er juin 2020, par EthanDevelops

  When I try to play my Music Discord Bot it doesn't play music. It uses ytdl-core and ffmpeg
My code is :

  



  const Discord = require('discord.js');
const bot = new Discord.Client

const ytdl = require("ytdl-core")


const token = 'API TOKEN'

const PREFIX = '?';

var version = '1.2';

var servers = {};

bot.on('ready', () =>{
    console.log('This bot is online!' + version);
})

bot.on('message', message => {

    let args = message.content.substring(PREFIX.length).split(" ");

    switch(args[0]){
        case 'play':

            function play(connection, message){
                var server = servers[message.guild.id];

                server.dispatcher = connection.play(ytdl(server.queue[0], {filter: "audioonly"}))

                server.queue.shift();

                server.dispatcher.on("end", function(){
                    if(server.queue[0]){
                        play(connection, message);
                    }else {
                        connection.disconnect();
                    }
                });



            }



            if(!args[1]){
                message.channel.send("You need to provide a link!")
                return;
            }

            if(!message.member.voice.channel){
               message.channel.send("You must be in a Voice Channel to play the bot!")
               return;
            }

            if(!servers[message.guild.id]) servers[message.guild.id] = {
                queue: []
            }

            var server = servers[message.guild.id];

            server.queue.push(args[1]);

            if(!message.guild.voice) message.member.voice.channel.join().then(function(connection){
                play(connection, message);
            })

        break;
    }



    });


    bot.login(token);


  



  Whenever I try to play a song this error happens :

  



  


  (node:5180) UnhandledPromiseRejectionWarning : Error : FFmpeg/avconv not
 found !
 at Function.getInfo (C :\Users\picar\Desktop\DiscordMusicBot\node_modules\prism-media\src\core\FFmpeg.js:130:11)
 at Function.create (C :\Users\picar\Desktop\DiscordMusicBot\node_modules\prism-media\src\core\FFmpeg.js:143:38)
 at new FFmpeg (C :\Users\picar\Desktop\DiscordMusicBot\node_modules\prism-media\src\core\FFmpeg.js:44:27)
 at AudioPlayer.playUnknown (C :\Users\picar\Desktop\DiscordMusicBot\node_modules\discord.js\src\client\voice\player\BasePlayer.js:47:20)
 at VoiceConnection.play (C :\Users\picar\Desktop\DiscordMusicBot\node_modules\discord.js\src\client\voice\util\PlayInterface.js:71:28)
 at play (C :\Users\picar\Desktop\DiscordMusicBot\index.js:29:48)
 at C :\Users\picar\Desktop\DiscordMusicBot\index.js:66:17
 at processTicksAndRejections (internal/process/task_queues.js:97:5)
 (node:5180) UnhandledPromiseRejectionWarning : Unhandled promise rejection. This error originated either by throwing inside of an async
 function without a catch block, or by rejecting a promise which was
 not handled with .catch(). To terminate the node process on unhandled
 promise rejection, use the CLI flag --unhandled-rejections=strict
 (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode).
 (rejection id : 1)
 (node:5180) [DEP0018] DeprecationWarning : Unhandled promise rejections are deprecated. In the future, promise rejections that are
 not handled will terminate the Node.js process with a non-zero exit
 code

  


  



  I'm getting very frustrated as the tutorial I'm watching is using a different version of everything !!! Please help.