@echo off
set ffmpeg_path="C:\Program Files (x86)\FFmpeg 6.0\bin\ffmpeg.exe"
set ffprobe_path="C:\Program Files (x86)\FFmpeg 6.0\bin\ffprobe.exe"

md trimmed

for %%a in ("*.mp4") do (
    for /f "tokens=* usebackq" %%b in (`"%ffprobe_path%" -v error -show_entries format^=duration -of default^=noprint_wrappers^=1:nokey^=1 "%%a"`) do (
        call :process "%%a" %%b
    )
)
goto :eof

:process
setlocal
set file=%~1
set duration=%~2

rem Remove fractional seconds
for /f "tokens=1 delims=." %%d in ("%duration%") do set /a new_end=%%d - 10

rem Format the new duration in HH:MM:SS
set /a hh=new_end / 3600
set /a mm=(new_end %% 3600) / 60
set /a ss=new_end %% 60

rem Pad with zeros
if %hh% lss 10 set hh=0%hh%
if %mm% lss 10 set mm=0%mm%
if %ss% lss 10 set ss=0%ss%

set end_time=%hh%:%mm%:%ss%

echo Trimming %file% from 00:03:00 to %end_time%
"%ffmpeg_path%" -i %file% -ss 00:03:00 -to %end_time% -c:v copy -c:a copy "trimmed\%file%"
endlocal
goto :eof