Concat movie files using ffmpeg (for Windows)

concat.cmd

@echo off
setlocal EnableExtensions

:genuniq
  set "tmpfile=%tmp%\bat~%RANDOM%.txt"
  if exist "%tmpfile%" goto :genuniq

set "output=%~dpn1_combined%~x1"

:loop
  set "f=%~f1"
  rem replace \ to /
  set "f=%f:\=/%"
  rem replace & to ^&
  set "f=%f:&=^&%"
  echo file '%f%' >> "%tmpfile%"
  shift
  if not "%~1" == "" goto loop

ffmpeg.exe -f concat -safe 0 -i "%tmpfile%" -c copy "%output%"

del "%tmpfile%"