Playlist author output template variable

[wlhlm]

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Description of your issue, suggested solution and other information

I'm trying to download playlists from Youtube and want to have them organized by the account that created the playlist. AFAICT, youtube-dl only gives the video author for output templates, which works as long as the playlist only includes videos from the same author.

Here is what I'm currently using: "%(uploader)s/%(playlist)s/%(playlist_index)s %(title)s.%(ext)s"

Let's say we have author1 with video1, video2, and playlist1, and author2 with video 3. playlist1 includes video1, video2, and video3. With the above template I end up with the following file structure when downloading playlist1:

author1/
   +- playlist1/
      +- video1
      +- video2
author2/
   +- playlist1/
      +- video3

What I want is:

author1/
   +- playlist1/
      +- video1
      +- video2
      +- video3

Which means I currently have to manually merge the author directories after downloading.

My request is to add an output template variable that corresponds to the author of the playlist (for example playlist_uploader).

[dstftw]

Duplicate of #11427.