Playlists folders erroneously named on NRK

[forthrin]

When using the following command line to download Lynda videos, the videos sort beautifully into folders which are named after the course.

youtube-dl --yes-playlist -o "%(playlist_title)s/%(playlist_index)s %(title)s.%(ext)s"

Now, with NRK, the folders should have been named by seasons (see left side of page):

Sesong 1980
    01 Halvsju 01.11.1980.mp4
    02 Halvsju 02.02.1980.mp4
    03 ...
    ...
Sesong 1981
    01 Halvsju 04.04.1981.mp4
    ....

But the folder is named after the file, creating a huge mess (100+ folders with one video in each).

Halvsju 01.11.1980
    01 Halvsju 01.11.1980.mp4
Halvsju 02.02.1980
    01 Halvsju 02.02.1980.mp4
Halvsju 04.04.1981
    01 Halvsju 04.04.1981.mp4
...
    ...

This should be an easy fix.

[debug] youtube-dl version 2017.04.03
[debug] Python version 2.7.10 - Darwin-16.4.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 3.2.2, ffprobe 3.2.2, rtmpdump 2.4