OlafSzmidt

@echo off 

if %1.==. goto usage

@echo Downloading playlist, then converting all files from here to ../.
youtube-dl -i -f bestvideo+bestaudio --merge-output-format mp4 %1
FOR /F "tokens=*" %G IN ('dir /b *.mp4') DO ffmpeg -i "%G" -b:v 1500k -vf scale=720:408 "..\%~nG.mp4"

:usage
@echo Usage: %0 playlistId