Reindex when downloading a playlist

[sahrawat]

Checklist

• I've verified that I'm running youtube-dl version 2020.03.24
• I've searched the bugtracker for similar feature requests including closed ones

Description

I am using this command to download multiple playlist from a file playlist.txt which has some links to playlist:

cat playlist.txt | xargs -n1 youtube-dl -o '%(playlist)s/%(playlist_index)s - %(title)s.%(ext)s'

Overtime these playlist index changes and when I run the above command again, it starts downloading the whole playlist. What I expect is that youtube-dl should reindex the already downloaded files when index changes.

Are there any workarounds to this?

[dstftw]

No reindexing is possible. For not downloading the same videos use --download-archive.