https://www.ted.com/talks/spencer_wells_a_family_tree_for_humanity

[ole-tange]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2021.05.16
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that all URLs and arguments with special characters are properly quoted or escaped
• I've searched the bugtracker for similar issues including closed ones

Verbose log

$ youtube-dl -v https://www.ted.com/talks/spencer_wells_a_family_tree_for_humanity
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-v', 'https://www.ted.com/talks/spencer_wells_a_family_tree_for_humanity']
[debug] Encodings: locale UTF-8, fs utf-8, out utf-8, pref UTF-8
[debug] youtube-dl version 2021.05.16
[debug] Python version 3.8.5 (CPython) - Linux-5.4.0-72-generic-x86_64-with-glibc2.29
[debug] exe versions: ffmpeg 4.2.4, ffprobe 4.2.4, phantomjs 2.1.1
[debug] Proxy map: {}
[ted] spencer_wells_a_family_tree_for_humanity: Downloading webpage
[youtube] tmHloU_xEJo: Downloading webpage
ERROR: Private video
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Traceback (most recent call last):
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 815, in wrapper
    return func(self, *args, **kwargs)
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 836, in __extract_info
    ie_result = ie.extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 534, in extract
    ie_result = self._real_extract(url)
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/youtube.py", line 1712, in _real_extract
    raise ExtractorError(reason, expected=True)
youtube_dl.utils.ExtractorError: Private video
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Description

https://www.ted.com/talks/spencer_wells_a_family_tree_for_humanity plays fine in private window in Firefox not logged in to Google/Youtube.