SyncSrtFileNames.cmd

@echo off
setlocal enabledelayedexpansion
pushd
if "%~1" == "" (
  echo Usage: SyncSrtFileNames {folder}
  goto :eof
)
cd /d "%~1"
if not errorlevel 0 (
  echo Path is not accessible.
  goto :eof
)
for %%A in (*.srt) do (
  set fname=%%A
  set fext=%%~xA
  set processed=0
  for /f "tokens=1-30 delims=." %%B in ("%%A") do (
    call :getprefix "%%B" "%%C" "%%D" "%%E" "%%F" "%%G" "%%H" "%%I" "%%J" "%%K" "%%L" "%%M" "%%N" "%%O" "%%P" "%%Q" "%%R" "%%S" "%%T" "%%U" "%%V" "%%W" "%%X" "%%Y" "%%Z" "%%[" "%%\" "%%]" "%%^^" "%%_"
  )
  if !processed! == 0 (
    for /f "tokens=1-30 delims= " %%B in ("%%A") do (
      call :getprefix "%%B" "%%C" "%%D" "%%E" "%%F" "%%G" "%%H" "%%I" "%%J" "%%K" "%%L" "%%M" "%%N" "%%O" "%%P" "%%Q" "%%R" "%%S" "%%T" "%%U" "%%V" "%%W" "%%X" "%%Y" "%%Z" "%%[" "%%\" "%%]" "%%^^" "%%_"
    )
  )
)
goto :eof

:getprefix
set eps=
set prefix=
set separator=.
call :gploop %*
set eps=
set prefix=
set "separator= "
call :gploop %*
goto :eof

:gploop
if "%~1" == "" goto :eof
set ch=%~1
call :chkeps %ch:~0,1% %ch:~1,1% %ch:~2,1% %ch:~3,1% %ch:~4,1% %ch:~5,1% %ch:~6,1%
if "%prefix%" == "" (
  set prefix=%~1
) else (
  set prefix=%prefix%%separator%%~1
)
if not "%eps%" == "" (
  if not "%prefix%" == "" (
    for %%B in ("%prefix%*") do (
      if !processed! == 0 if not "%%~B" == "%fname%" (
        echo dummy: ren "%fname%" "%%~nB%!fext!"
        set processed=1
      )
    )
  )
  goto :eof
)
shift
goto :gploop

:chkeps
if not "%7" == "" goto :eof
if /i not "%1" == "s" goto :eof
set /a num=(%2*10)+%3
if !num! == 0 goto :eof
if /i not "%4" == "e" goto :eof
set /a num=(%5*10)+%6
if !num! == 0 goto :eof
set eps=%ch%