使用 discord.js 和 ytdl-core 播放音频文件

Question

我正在尝试使用 ytdl 和 discord.js 下载并播放从 youtube 获取的音频文件：

        ytdl(url)
            .pipe(fs.createWriteStream('./music/downloads/music.mp3'));

        var voiceChannel = message.member.voiceChannel;
        voiceChannel.join().then(connection => {
            console.log("joined channel");
            const dispatcher = connection.playFile('./music/downloads/music.mp3');
            dispatcher.on("end", end => {
                console.log("left channel");
                voiceChannel.leave();
            });
        }).catch(err => console.log(err));
        isReady = true

我成功地在 ./music/downloads/ 中播放了没有 ytdl 部分的 mp3 文件 (ytdl(url).pipe(fs.createWriteStream('./music/downloads/music.mp3'));)。但是当那部分在代码中时，机器人就会加入和离开。

这是带有 ytdl 部分的输出：

Bot has started, with 107 users, in 43 channels of 3 guilds.
joined channel
left channel

这是没有 ytdl 部分的输出：

Bot has started, with 107 users, in 43 channels of 3 guilds.
joined channel
[plays mp3 file]
left channel

为什么会这样，我该如何解决？

Answer 1

你这样做的效率很低。读写之间没有同步。
等待文件写入文件系统，然后读取！

直接串流

将YTDL的视频输出重定向到dispatcher，先转换成opus音频数据包，然后从你的电脑流式传输到Discord。

message.member.voiceChannel.join()
.then(connection => {
    console.log('joined channel');

    connection.playStream(ytdl(url))
    // When no packets left to send, leave the channel.
    .on('end', () => {
        console.log('left channel');
        connection.channel.leave();
    })
    // Handle error without crashing the app.
    .catch(console.error);
})
.catch(console.error);

FWTR（先写后读）

您使用的方法非常接近成功，但失败是您不同步读/写。

var stream = ytdl(url);

// Wait until writing is finished
stream.pipe(fs.createWriteStream('tmp_buf_audio.mp3'))
.on('end', () => {
    message.member.voiceChannel.join()
    .then(connection => {
        console.log('joined channel');

        connection.playStream(fs.createReadStream('tmp_buf_audio.mp3'))
        // When no packets left to send, leave the channel.
        .on('end', () => {
            console.log('left channel');
            connection.channel.leave();
        })
        // Handle error without crashing the app.
        .catch(console.error);
    })
    .catch(console.error);
});

Answer 2

当您需要播放音频流时，请使用 playStream 而不是 playFile。

const streamOptions = { seek: 0, volume: 1 };
var voiceChannel = message.member.voiceChannel;
        voiceChannel.join().then(connection => {
            console.log("joined channel");
            const stream = ytdl('https://www.youtube.com/watch?v=gOMhN-hfMtY', { filter : 'audioonly' });
            const dispatcher = connection.playStream(stream, streamOptions);
            dispatcher.on("end", end => {
                console.log("left channel");
                voiceChannel.leave();
            });
        }).catch(err => console.log(err));