vorbis format selection

[sebma]

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Hi,

I'm trying to select the 171 format of a youtube link using an explicit manner :

$ youtube-dl -F https://www.youtube.com/watch?v=KMYovo6SoR4 | grep vorbis
171          webm       audio only DASH audio  121k , vorbis@128k, 2.39MiB
$ youtube-dl --ignore-config -v -f "best[acodec=vorbis]" https://www.youtube.com/watch?v=KMYovo6SoR4 
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--ignore-config', '-v', '-f', 'best[acodec=vorbis]', 'https://www.youtube.com/watch?v=KMYovo6SoR4']
[debug] Encodings: locale UTF-8, fs utf-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2019.03.01
[debug] Python version 3.6.5 (CPython) - Linux-4.4.0-142-generic-x86_64-with-debian-jessie-sid
[debug] exe versions: avconv 3.4.4-1, avprobe 3.4.4-1, ffmpeg 3.4.4-1, ffprobe 3.4.4-1, rtmpdump 2.4
[debug] Proxy map: {}
[youtube] KMYovo6SoR4: Downloading webpage
[youtube] KMYovo6SoR4: Downloading video info webpage
ERROR: requested format not available
Traceback (most recent call last):
  File "/usr/local/miniconda3/lib/python3.6/site-packages/youtube_dl/YoutubeDL.py", line 805, in extract_info
    return self.process_ie_result(ie_result, download, extra_info)
  File "/usr/local/miniconda3/lib/python3.6/site-packages/youtube_dl/YoutubeDL.py", line 859, in process_ie_result
    return self.process_video_result(ie_result, download=download)
  File "/usr/local/miniconda3/lib/python3.6/site-packages/youtube_dl/YoutubeDL.py", line 1632, in process_video_result
    expected=True)
youtube_dl.utils.ExtractorError: requested format not available

$ echo $?
1

Can you please tell me how to do it ?

[dstftw]

It's bestaudio not best.

[sebma]

@dstftw Thanks :)