audio cog YT always errors with "Nothing found. This video cannot be loaded."

[mathieucaroff]

What Red version are you using?

3.5.22

Cog name

Audio

Command name

play

What did you expect to happen?

I expected the bot to play the audio of the video in the channel them and I was in.

What actually happened?

The bot did not played any audio and produced an error message in the discord channel where I issued the command. The error message is:

Nothing found.
This video cannot be loaded.

How can we reproduce this error?

1. (Install, configure and start red: python -m pip install -U Red-DiscordBot, redbot-setup, redbot <instance-name>)
2. Enable the Audio cog: [p]load audio
3. Wait for Lavalink to be installed and connected
4. Join an audio channel in the server and have the bot play some music: [p]sing (or [p]play https://www.youtube.com/watch?v=f9O2Rjn1azc)

The bot does not play any music and errors with "Nothing found. This video cannot be loaded."

Note: Environment (fresh install):

$ lsb_release -cd
Description:    Ubuntu 24.04.3 LTS
Codename:       noble

Anything else?

No response

[Flame442]

You are likely getting hit by the cipher issue currently affecting Lavalink. YT frequently changes their cipher signature, which breaks Lavalink. If you want to confirm that this is the issue, you can post the spring.log file from your Lavalink server, which contains the information needed to diagnose this kind of issue. If you are using a managed Lavalink server (the default), [p]audioset logs can be used to easily retrieve the logs.

If you are experiencing this issue, it means that the signature Youtube is serving you is one Lavalink does not know how to handle. The fix for right now requires running/connecting to an external service to decipher the new sigs. you either host yourself or use a public one. Some instructions can be found here.
https://github.com/lavalink-devs/youtube-source?tab=readme-ov-file#using-a-remote-cipher-server
We provided the Lavalink.jar and application.yml files, so you just need to run that specific JAR and make the required changes to the .yml file (note, you will need to update the youtube-source plugin version to the latest version as the one we use does not support the yt-cipher script)

When/if there is a better solution from upstream, we will implement it. If you need any more help, consider joining our support server.

[mathieucaroff]

Here is the file: spring.log

Please do tell me whether this is a cipher signature issue.

[Flame442]

Caused by: dev.lavalink.youtube.cipher.ScriptExtractionException: Must find sig function from script

Yes, this appears to be the cipher issue.