python errors while downloading youtube vid

[victordesfe]

Checklist

• [x ] I'm reporting a broken site support issue
• [ x] I've verified that I'm running youtube-dl version 2019.09.12.1
• [ x] I've checked that all provided URLs are alive and playable in a browser
• [ x] I've checked that all URLs and arguments with special characters are properly quoted or escaped
• [x ] I've searched the bugtracker for similar bug reports including closed ones
• I've read bugs section in FAQ

Verbose log

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['-f', 'bestaudio[ext=opus]', '--extract-audio', '--a
udio-quality', '192', '--audio-format', 'mp3', '--batch-file', 'download.txt', '
-v']
[debug] Batch file urls: ['https://www.youtube.com/watch?v=Pxj3wGj-SdM']
[debug] Encodings: locale cp1252, fs mbcs, out cp850, pref cp1252
[debug] youtube-dl version 2019.09.12.1
[debug] Python version 3.4.4 (CPython) - Windows-7-6.1.7601-SP1
[debug] exe versions: ffmpeg 3.4
[debug] Proxy map: {}
[youtube] Pxj3wGj-SdM: Downloading webpage
[youtube] Pxj3wGj-SdM: Downloading video info webpage
[youtube] {18} signature length 104, html5 player vfleGIwAA
[youtube] {136} signature length 108, html5 player vfleGIwAA
[youtube] {247} signature length 108, html5 player vfleGIwAA
[youtube] {135} signature length 108, html5 player vfleGIwAA
[youtube] {244} signature length 104, html5 player vfleGIwAA
[youtube] {134} signature length 108, html5 player vfleGIwAA
[youtube] {243} signature length 108, html5 player vfleGIwAA
[youtube] {133} signature length 108, html5 player vfleGIwAA
[youtube] {242} signature length 104, html5 player vfleGIwAA
[youtube] {160} signature length 108, html5 player vfleGIwAA
[youtube] {278} signature length 104, html5 player vfleGIwAA
[youtube] {140} signature length 108, html5 player vfleGIwAA
[youtube] {249} signature length 104, html5 player vfleGIwAA
[youtube] {250} signature length 108, html5 player vfleGIwAA
[youtube] {251} signature length 108, html5 player vfleGIwAA
ERROR: requested format not available
Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmphopugs
4t\build\youtube_dl\YoutubeDL.py", line 807, in extract_info
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmphopugs
4t\build\youtube_dl\YoutubeDL.py", line 861, in process_ie_result
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmphopugs
4t\build\youtube_dl\YoutubeDL.py", line 1634, in process_video_result
youtube_dl.utils.ExtractorError: requested format not available

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Description

Hi i wanted to donwload audio only of a youtube song, but python errors show up for unknown reason. here's the argument i used;
youtube-dl.exe -f "bestaudio[ext=opus]" --extract-audio --audio-quality 192 --audio-format mp3 --batch-file "download.txt" -v

download txt has only one line:
https://www.youtube.com/watch?v=Pxj3wGj-SdM

thanks in advance

[dstftw]

Error message clearly tells you there is no bestaudio with ext == opus.

[victordesfe]

what extension does opus audio uses? i thought it was .opus, as it says on wikipedia