[dokxpi@vk]

Нечего не происходит, с файлами точно
https://yadi.sk/d/cRkOqGkBgVMDJ (окно запуска)

Код:

@Echo Off

Set "Where=D:\Media"
Set "Mask=*.avi"

rem FOR /F "usebackq delims=" %%d IN (`Dir "%Where%\" /b /s /A:D`) DO (

FOR /F "usebackq delims=" %%d IN (`Dir /b /s /A:D`) DO (

echo %%d

	Set /A Count=1000
	FOR /F "usebackq delims=" %%f IN (`Dir "%%d\%Mask%" /b /A:-D /O:D /T:W 2^>nul`) DO Call :Recount "%%d\%%f" "%%d"
)
GoTo :Eof

:Recount
Set /A Count=%Count%+1

Set "DC=%~t1"
Set "DC=%DC:~6,4%-%DC:~3,2%-%DC:~0,2%"

rem ren %1 "%DC%_%Count:~-2%%~x1"


echo ren %1 "%DC%_%Count:~-2%%~x1"