Create Stream

This is a checkpoint where discord-player calls createStream before downloading stream.

Custom stream Engine

Discord Player by default uses node-ytdl-core for youtube and some other extractors for other sources. If you need to modify this behavior without touching extractors, you need to use createStream functionality of discord player. Here's an example on how you can use play-dl to download youtube streams instead of using ytdl-core.

const playdl = require("play-dl");

// other code
const queue = player.createQueue(..., {
    ...,
    async onBeforeCreateStream(track, source, _queue) {
        // only trap youtube source
        if (source === "youtube") {
            // track here would be youtube track
            return (await playdl.stream(track.url)).stream;
            // we must return readable stream or void (returning void means telling discord-player to look for default extractor)
        }
    }
});

<Queue>.onBeforeCreateStream is called before actually downloading the stream. It is a different concept from extractors, where you are just downloading streams. source here will be a video source. Streams from onBeforeCreateStream are then piped to FFmpeg and finally sent to Discord voice servers.

FAQ

How can I remove this?

If you already made this change and want to switch to default mode in runtime, you can set queue.onBeforeCreateStream to null which will make discord-player use default config.

Which stream format should I return?

It's not necessary to return opus format or whatever, since every streams have to be converted to s16le, due to inline volume.

Can I use ytdl-core-discord?

Yes, you can.

Can I use this for other sources, like soundcloud?

Absolutely.

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