node app.js url [options]
--dst, -d - destination folder (default: ./)
--first-index, -f - index of first video to download (default: 1)
--last-index, -l - index of last video to download (default: last index in playlist)
--streams, -s - number of download streams (default: 1)
# to download all videos in playlist use:
node app.js https://www.youtube.com/playlist?list=PLCAM4-OTb6rm7Ef6yeXlk8829Mj22HalZ --dst=./movies/
# this playlist contains 43 videos. To download videos #20-#30 use:
node app.js https://www.youtube.com/playlist?list=PLCAM4-OTb6rm7Ef6yeXlk8829Mj22HalZ --dst=./movies/ -f 20 -l 30