skip already downloaded files - any solution?

[tottitu]

hi, first of all sorry for my english but i'm italian and u know..we are not the best with foreign languages.
my problem: i have to extract the audio from every video in a youtube channel and i want to delete the video files.
i will run a cron job every week with this script:

$ youtube-dl -o '/MY/FOLDER/%(uploader)s/%(upload_date)s - %(title)s.%(ext)s' ytuser:YOUTUBECHANEL --dateafter "date +"%Y%m%d" -d "8 day ago"" -i -c -x --audio-format best --audio-quality 0

but when i run this script it appears that phyton have problems with the date.
so, what should i do? tnx

[phihag]

Sorry, I'm not sure what you do expect and what is wrong - by default, youtube-dl deletes the video when you specify --extract-audio/-x. Notably, your dateafter specifcation is literally a string. Most likely, you want

youtube-dl ... --dateafter $(date +"%Y%m%d" -d "8 day ago")