The string argument which is returned
Most certainly the API you are using this function with changed from returning a Buffer to returning the actual uuid string. You can safely remove the call to unparse. Most certainly this call to unparse is located in you CameraSource which you converted from the old style CameraSource API to the new CameraControllers.
Parses the uuid as a string from the given Buffer. The parser will use the first 8 bytes.
The buffer to read from.
Parses the uuid as a string from the given Buffer at the specified offset.
The buffer to read from.
The offset in the buffer to start reading from.
Returns the identity of the passed argument.