@echo off
set "SRC_ROOT=C:\tv-shows"
set "DST_ROOT=C:\reencodes"

rem File extensions to process (add or remove as needed)
set "EXT_LIST=mp4 mkv avi mov ts"

for /R "%SRC_ROOT%" %%F in (*.*) do (
    for %%X in (%%~xF) do set "EXT=%%~X"
    setlocal enabledelayedexpansion
    set "EXT_LOWER=!EXT:~1!"
    echo %EXT_LIST% | findstr /i "\<!EXT_LOWER!\>" >nul
    if not errorlevel 1 (

        rem Compute relative path
        set "REL_PATH=%%~dpF"
        set "REL_PATH=!REL_PATH:%SRC_ROOT%\=!"

        rem Build destination folder and filename with .mp4 extension
        set "DST_DIR=%DST_ROOT%\!REL_PATH!"
        set "DST_FILE=!DST_DIR!\%%~nF.mp4"

        rem Create destination directory if it doesn't exist
        if not exist "!DST_DIR!" mkdir "!DST_DIR!"

        rem Run ffmpeg re-encode to .mp4
        ffmpeg -i "%%F" -c:v libx264 -preset veryfast -crf 21 -c:a aac -b:a 128k "%%DST_FILE%%"
    )
    endlocal
)