Did you try with manual commands ?
I've long been a Windows user but never expected to use the command line; when I started I had a lot of problems and evolved my own way of working:
I put a copy of NConvert in the same folder as my batch file, which means that the code always finds NConvert, solving one early issue.
I also find using a batch file simplifies testing code variations quickly to troubleshoot problems, but that may just be due to my lack of experience working at the command line.
I was also originally looking to produce scripts that could perform multiple actions, for which a batch file is necessary.
I doubt in this case if using a batch file makes any difference to the result obtained, although as I said in other cases the code may sometimes need to be modified slightly.
Is it possible to contact you via skype ? I need to talk to you regarding my queries related to nconvert ?
I don't use Skype and don't really want to start using it, there is also the practical problem that I am seriously overloaded with other things to do at the moment...