@echo off
cd /d "%~dp0"
setlocal enabledelayedexpansion
for %%a in (avi blf mf4) do (
    call :ChangeName %%a
)
pause
goto :eof

:ChangeName
for /f "delims=" %%i in ('dir /b /a-d *.%1 ^| find /v /c ""') do (
    set "FileCount=%%i"
)
set "NumLast=1000!FileCount!"
for /f "delims=" %%i in ('dir /b /a-d /o-n *.%1') do (
    set "NewName=%%~ni_log!NumLast:~-3!%%~xi"
    ren "%%i" "!NewName!"
    set /a "NumLast-=1"
)
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@echo off
cd /d "%~dp0"
setlocal enabledelayedexpansion
set "SeqNum=10001"
for /f "delims=" %%i in ('dir /b /a-d *.avi *.blf *.mf4') do (
    set "_%%~ni=%%~ni"
)
for /f "tokens=1* delims==" %%i in ('set _') do (
    set "NewName=%%j_log!SeqNum:~-3!"
    if exist "%%j.avi" (
        ren "%%j.avi" "!NewName!.avi"
    )
    if exist "%%j.blf" (
        ren "%%j.blf" "!NewName!.blf"
    )
    if exist "%%j.mf4" (
        ren "%%j.mf4" "!NewName!.mf4"
    )
    set /a "SeqNum+=1"
)
endlocal
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@echo off
cd /d "%~dp0"
setlocal enabledelayedexpansion
set "SeqNum=10001"
for /f "delims=" %%i in ('dir /b /a-d *.avi *.blf *.mf4') do (
    set "OldName=%%~ni"
    if "!OldName:~-1!" equ "_" (
        set "_!OldName:~0,-1!=!OldName:~0,-1!"
    ) else (
        set "_!OldName!=!OldName!"
    )
)
for /f "tokens=1* delims==" %%i in ('set _') do (
    set "NewName=%%j_log!SeqNum:~-3!"
    if exist "%%j.avi" (
        ren "%%j.avi" "!NewName!.avi"
    ) else if exist "%%j_.avi" (
        ren "%%j_.avi" "!NewName!.avi"
    )
    if exist "%%j.blf" (
        ren "%%j.blf" "!NewName!.blf"
    ) else if exist "%%j_.blf" (
        ren "%%j_.blf" "!NewName!.blf"
    )
    if exist "%%j.mf4" (
        ren "%%j.mf4" "!NewName!.mf4"
    ) else if exist "%%j_.mf4" (
        ren "%%j_.mf4" "!NewName!.mf4"
    )
    set /a "SeqNum+=1"
)
endlocal
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