Discord.js 音乐机器人：TypeError：this.inputMedia.pipe 不是函数

Question

我正在使用 Discord.js 编写音乐 Discord 机器人。该机器人使用 ytdl-core、node-opus，并且我在我的操作系统（Ubuntu 19.04）上安装了 ffmpeg。当我尝试让机器人加入语音频道并开始播放 YouTube URL 时，它会引发以下错误：

TypeError: this.inputMedia.pipe is not a function
    at FfmpegProcess.connectStream (/home/ivan/.../node_modules/discord.js/node_modules/prism-media/src/transcoders/ffmpeg/FfmpegProcess.js:73:21)
    at new FfmpegProcess (/home/ivan/.../node_modules/discord.js/node_modules/prism-media/src/transcoders/ffmpeg/FfmpegProcess.js:28:14)
    at FfmpegTranscoder.transcode (/home/ivan/.../node_modules/discord.js/node_modules/prism-media/src/transcoders/ffmpeg/Ffmpeg.js:34:18)
    at MediaTranscoder.transcode (/home/ivan/.../node_modules/discord.js/node_modules/prism-media/src/transcoders/MediaTranscoder.js:27:31)
    at Prism.transcode (/home/ivan/.../node_modules/discord.js/node_modules/prism-media/src/Prism.js:13:28)
    at AudioPlayer.playUnknownStream (/home/ivan/.../node_modules/discord.js/src/client/voice/player/AudioPlayer.js:97:35)
    at VoiceConnection.playStream (/home/ivan/.../node_modules/discord.js/src/client/voice/VoiceConnection.js:478:24)
    at voiceChannel.join.then.connection (/home/ivan/.../commands/play.js:32:47)
    at process._tickCallback (internal/process/next_tick.js:68:7)

这是我的代码：

const ytdl = require("ytdl-core");

exports.run = (client, message, args, config) => {
    return new Promise((resolve, reject) => {
        if (args.length !== 1) {
            message.channel.send("Play command takes 1 YouTube link.");
            reject("Wrong number of arguments");
            return;
        }
        const voiceChannel = message.member.voiceChannel;
        if(!voiceChannel) {
            message.channel.send("You need to connect to a voice channel first");
            reject("Not connected to voice channel");
            return;
        }
        const perms = voiceChannel.permissionsFor(message.client.user);
        if (!perms.has("CONNECT")) {
            message.channel.send("You need to add the 'connect' permission for this bot");
            reject("NO CONNECT PERMISSION");
            return;
        }
        if (!perms.has("SPEAK")) {
            message.channel.send("You need to add the 'speak' permission for this bot");
            reject("NO SPEAK PERMISSION");
            return;
        }
        const streamOptions = { seek: 0, volume: 1, passes: 2 };
        voiceChannel.join()
            .then(connection => {
                const stream = ytdl(args[0], {filter: 'audioonly'});
                const dispatcher = connection.playStream(ytdl, streamOptions);
                dispatcher.on("end", reason => {
                    console.log("reason: " + reason);
                    voiceChannel.leave();
                })
                dispatcher.on("error", err => {
                    console.log(err);
                })
            })
        .catch(err => console.log(err));
    });    
}

我尝试重新安装 ffmpeg、node 和 npm、discord.js 和 node-opus。我安装了最新版本的 Discord.js，以及 ffmpeg 版本 4.1.3-0ubuntu1。有人有什么建议吗？

谢谢。

Answer 1

发现了问题，在以下几行：

const stream = ytdl(args[0], {filter: 'audioonly'});
const dispatcher = connection.playStream(ytdl, streamOptions);

正确的代码是

const stream = ytdl(args[0], {filter: 'audioonly'});
const dispatcher = connection.playStream(stream, streamOptions);

编辑：更正蒸汽流