Subtitle not downloaded for one particular episode

[forthrin]

• I've verified and I assure that I'm running youtube-dl 2018.08.04
• At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones
• Checked that provided video/audio/playlist URLs (if any) are alive and playable in a browser
• Bug report (encountered problems with youtube-dl)

---

$ youtube-dl --write-sub --skip-download --verbose https://tv.nrk.no/serie/the-bold-type/sesong/2/episode/10
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'--write-sub', u'--skip-download', u'--verbose', u'https://tv.nrk.no/serie/the-bold-type/sesong/2/episode/10']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2018.08.04
[debug] Python version 2.7.15 (CPython) - Darwin-16.7.0-x86_64-i386-64bit
[debug] exe versions: ffmpeg 4.0.1, ffprobe 4.0.1, rtmpdump 2.4
[debug] Proxy map: {}
[NRKTVEpisode] the-bold-type/sesong/2/episode/10: Downloading webpage
[debug] Using fake IP 84.210.222.98 (NO) as X-Forwarded-For.
[NRK] KOIF10002618: Downloading mediaelement JSON
[NRK] KOIF10002618: Downloading f4m manifest
[NRK] KOIF10002618: Downloading m3u8 information
[download] Downloading playlist: The Bold Type 10:10
[NRK] playlist The Bold Type 10:10: Collected 1 video ids (downloading 1 of them)
[download] Downloading video 1 of 1
[debug] Default format spec: bestvideo+bestaudio/best
[download] Finished downloading playlist: The Bold Type 10:10
~$

Replace 10 with any lower number and the subtitle is downloaded.

[dstftw]

> py -3.6 .\youtube_dl\__main__.py --write-sub --skip-download --verbose https://tv.nrk.no/serie/the-bold-type/sesong/2/episode/10
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--write-sub', '--skip-download', '--verbose', 'https://tv.nrk.no/serie/the-bold-type/sesong/2/episode/10']
[debug] Encodings: locale cp1251, fs utf-8, out utf-8, pref cp1251
[debug] youtube-dl version 2018.08.04
[debug] Git HEAD: 24e0cd7
[debug] Python version 3.6.4 (CPython) - Windows-10-10.0.10240-SP0
[debug] exe versions: ffmpeg N-85653-gb4330a0, ffprobe N-85653-gb4330a0, phantomjs 2.1.1, rtmpdump 2.4
[debug] Proxy map: {}
[NRKTVEpisode] the-bold-type/sesong/2/episode/10: Downloading webpage
[debug] Using fake IP 84.209.95.141 (NO) as X-Forwarded-For.
[NRK] KOIF10002618: Downloading mediaelement JSON
[NRK] KOIF10002618: Downloading f4m manifest
[NRK] KOIF10002618: Downloading m3u8 information
[download] Downloading playlist: The Bold Type 10:10
[NRK] playlist The Bold Type 10:10: Collected 1 video ids (downloading 1 of them)
[download] Downloading video 1 of 1
[debug] Default format spec: bestvideo+bestaudio/best
--> [info] Writing video subtitles to: The Bold Type 10_10-KOIF10002618BA.no.ttml <--
[download] Finished downloading playlist: The Bold Type 10:10