Sorry, but no patches. But I don't see the problem here. You do not want the audio at all from the camera since you tried to use jpeg. I see several solutions here.
1.continue with the rtsp as you have now. User use the App, but they do not get access to the Library. To not get access to the Library you configure in the User account in NCS. Then they have only the live camera and without audio.
2.continue with rtsp. In the configuration of the camera you can turn off the audio from the camera in the configuration as
3.Change from rtsp to mjpeg. jpeg is slow as you experienced. MJPEG is fast and can be set in the configuration of the camera as
Config for one of the streams.
In NCS use Custom URL and set stream type to mjpeg and the URL:
if you set up stream 2 to be mjpeg.
4.You have also a predefined template for this camera
If you use the template the Source is the number of the camera stream.
This should work for you. I hope