This is the script I use for youtube-dl on Windows:
title ydl %*
youtube-dl -f "bestvideo[height<=480]+bestaudio/best[height<=480]" %*
REM --external-downloader aria2c --external-downloader-args "-c -j3 -x3 -s3 -k 1M"
I had trouble with aria2c last time I used it, so I took that part out, but those are the options I was using.