@echo off
setlocal enabledelayedexpansion

set index=0

for %%f in (*.mp4) do (
    set files[!index!]=%%~nf
    echo !index!. %%~nf
    set /a index+=1
)
 set /p select_index=Select:
    for /l %%i in (!select_index!, 1, !select_index!) do (
        if defined files[%%i] (
            call :cut_mp4 !files[%%i]!
        )
    )

exit /b 0

:convert_mp4
ffmpeg -i %~1.mp4 ^
       -c:a copy ^
       -c:v hevc_nvenc ^
       -vf scale=1920:-1 ^
       -preset slow ^
       -crf 20 ^
       output/%~1.mp4
exit /b 0

:cut_mp4
md output\%~1

for /f "tokens=2 delims=, " %%a in ('ffmpeg -i %~1.mp4 2^>^&1 ^| find "Duration:"') do (
    set duration=%%a
    set /a duration_seconds=!duration:~0,2!*3600+!duration:~3,2!*60+!duration:~6,2!
    set /a frames=!duration_seconds!/30
)

for /l %%j in (1, 1, !frames!) do (
    set /a hours=%%j/120
    if !hours! lss 10 (set hours=0!hours!)
    set /a minutes=%%j/2-!hours!*60
    if !minutes! lss 10 (set minutes=0!minutes!)
    set /a seconds=%%j*30-!hours!*3600-!minutes!*60
    if !seconds! lss 10 (set seconds=0!seconds!)
    set times=!hours!:!minutes!:!seconds!

    ffmpeg -loglevel error ^
           -ss !times! ^
           -i %~1.mp4 ^
           -f image2 ^
           -frames:v 1 ^
           -q:v 1 ^
           output/%~1/!hours!_!minutes!_!seconds!-0.jpg
)
exit /b 0

pause
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