Problem:
Same issues as you all. helicopter-like choppy audio. I've had this problem for 3 weeks now. I have a podcast that I was doing on FB Live and I've migrated to YouTube and Twitch.
My setup:
Audio running through external Behringer mixer into my Line In > Voicemeeter Banana > Voice Mod > OBS > Restream.io > Youtube/Twitch.
All worked fine.
What Changed to create the problem:
For that premier of my show on the different network... I was going to up my game with new equipment:
Elgato Camlink 4k: Canon m50 connected
Elgato Stream Deck XL
and use ReStream.io.
Since adding these, I got super choppy audio.. terrible and hard to follow. like talking to someone through a fan.
3 shows ruined because of this.
Solution for me:
I found this video tonight after hunting though this thread and spent the next 4 hours tinkering with settings and constantly restarting.
Followed these instructions -
https://www.youtube.com/watch?v=s29G8QtSK_s
My issue was that my audio wasn't set to 48khz across the board. I found this by opening my speaker settings in windows and my recording device was set to 48. So I proceeded to check every program my audio runs through and verified they were 48. OBS was the only one set to 44.1khz in the Settings > Audio > "Sample Rate" field. Changed that from 44.1 to 48 and vuala! I've done 6 different test streams working on different settings to fix my rendering/encoding lag performance and nothing I've done since has impacted the audio when testing the different scenes and widgets from StreamLabs.
Fixed it for me! Good luck!