Use bash and linux tools to rename files in a folder, to the folder name.

rename-movie-titles.sh

#!/bin/bash
# SYNOPSIS: Rename all files in folder to match folder name. 

# Testing 1
# rename -vn 's:(/[^/]*)/[^/]*$:$1$1.mkv:' folder/*/*.mkv

# Testing 2
#for f in folder/*/*.mkv;do dn="${f%/*}";echo mv -v "$f" "${dn}/${dn##*/}.mkv";done

# Testing #3
# find folder/* -maxdepth 0 -type d -execdir sh -c 'test -f "$0"/*.mkv"&&echo mv -v "$0"/*.mkv "$0/${0##*/}.iso"' '{}' \;