What are stacks:// good for ?

Greetings,

Apologies for a long introduction, jump to the end for the real question, the story
about my current setup and how I got there may help newbies in the wonderful
digital multimedia movie world.

Phase 0 – about 10 years ago

Start of the Home Cinema project including 50″ Plasma Screen and 5.1 audio ( actually 5.2 because of 2 sub-woofers ).
Then buy Movie DVD’s, a bit old school , but wanted the original DVD image and sound quality.
Internet RIP’s not even close to the original DVD and of course highly illegal.
The DVD collection went up to several hundred titles, so finding a Movie and feeding the DVD player became a bit of a pain.

Phase 1 – about 5 years ago

Go Digital and select adequate hardware / software.

On the hardware side : Windows 7 PC and Popcorn Hour A200 media player.
The A200 was soon upgraded to A210 just replacing the plastic case with a metal case,
removing the sometimes noisy fan and adding a 1 TB hard drive in the process.

On the software side ( running on Windows 7 PC ) :

– Handbrake to convert DVD to digital video file.
– DVDFab passkey to rip DVD’s
– Media Companion to organize the Movie Library and create NFO files
– Yamj to pick up the NFO information and create the HTML interface for playing movies on the Popcorn Hour.

Phase 2 – about 1 year ago

Go open source with mediaplayer and centralize media storage.

While the trusty Popcorn Hour was still performing well playing Movies, the software
on the box became more and more outdated which would eventually lead to purchasing a new
A500 model to keep up with recent firmware ( Android : sounds familiar ?).

New hardware : Raspberry Pi model 2 + HifiBerry Digi+ audio board ( for surround sound ) and Synology NAS.
New Software : Kodi 15 , Openelec version for Raspi 2 and Windows version on PC.

So far so good, but importing the Movie library using NFO only scraper turned out difficult.

The Problem

Most of single movies appeard OK after scanning , which was done on the PC for speed.
Movie sets ( about 40 of them ), would randomly either have missing or double entries.
Nothing wrong with the NFO files, so time to dig into the SQL lite database ( MyVideos93.db )
using a nice free Windows tool called “SQL Lite”.
It became clear that several movie set entries where doubled into one referred as
“nfs://bla.bla…….mkv”, pointing to the Synology NAS and
another referred as the same , but preceeded with stack:// , so “stack://nfs://bla.bla…..mkv”.
Kodi Wiki does speak about stacks as a way to define multipart movies, but nowhere
any reference to this strange stack:// prefix for the actual file location.
My current workaround is using SQL Lite tool to clear the offending stack:// entries
both in the movie and files table. Done that and all movie set related errors disappear
from the Kodi movie library.

Any insight in how these stack:// entries show ow scraping with NFO only settings
would be appreciated.

Francis