I'm developing some Python scripts to read/parse/process some .vrscene files.
From others' examples, I can see that there is a Python SDK for VRay called vrayutils.
I want to get this information from the SettingsOutput object.
From a .vrscene file I want to get the total frame numbers.
Does anyone know where I can get that Python library or how I can call it?
I was able to do some of the things by parsing the file using basic Python and then extracting the things I needed.
The V-Ray API has a proprietary license, and there is no open source way to access the .vrscene 
I decided to try with a trial version of the SDK, and by using the SDK you will be able to find a nice Python build wrapped with a bunch of examples within the V-Ray Application SDK.
The price is 1250 euro annually for a single development license (for one server node). 
Support is included.
They can give you a preliminary evaluation version for 3 months under NDA (What I used).
No reverse engineering is permitted so if you are planning to develop over V-Ray you should buy it.
Getting access to VRay Python SDK