CODEWITHSUNDEEP
node.jsffmpegdiscordrtpdiscord.js
qxu21
qxu21

Reputation: 538

How to stream Opus stream from Discord to RTP

I'm using a Node.JS Discord bot to stream a voice call over RTP. Currently, in my speaking event handler, I have

var cmd = child_process.spawn("ffmpeg", [
          '-protocol_whitelist', 'file,crypto,sdp,rtp,udp,pipe,opus',
          '-re',
          '-acodec', 'opus',
          '-i', '-',
          '-ar', '8000',
          '-acodec', 'pcm_mulaw',
          '-f', 'mulaw',
          '-f', 'rtp',
          `rtp://${rtp_ip}:${rtp_port}`]);
reciever.createOpusStream(user).pipe(cmd.stdin);

equivalent to running the ffmpeg command ffmpeg -protocol_whitelist file,crypto,sdp,rtp,udp,pipe,opus -re acodec opus -i - -ar 8000 -acodec pcm_mulaw -f mulaw -f rtp rtp://${rtp_ip}:${rtp_port}

Variations of this command produce errors ranging from pipe:: Invalid input or pipe:: Invalid argument to Invalid data on input. to [mp3 @ 0x5615decebe60] Format mp3 detected only with low score of 1, misdetection possible! [mp3 @ 0x5615decebe60] Failed to read frame size: Could not seek to 16101. Could anyone help me with sending a ReadableStream (opus) to an RTP mulaw stream? Thanks!

Upvotes: 1

Views: 1481

Answers (1)

qxu21
qxu21

Reputation: 538

I asked on the ffmpeg IRC and realized that raw Opus bitsreams can't be decoded. I instead passed in a raw PCM stream and added -f s32le to the input, which is listed as a format in ffmpeg -formats.

Upvotes: 1

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