Downloading audio from youtube video fails with timeout, no retries

[salty-horse]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2020.05.03
• 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

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: [u'-v', u'-x', u'https://www.youtube.com/watch?v=i4-Wiokzhik']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2020.05.03
[debug] Git HEAD: 00a41ca4c
[debug] Python version 2.7.18rc1 (CPython) - Linux-5.4.0-29-generic-x86_64-with-Ubuntu-20.04-focal
[debug] exe versions: ffmpeg 4.2.2, ffprobe 4.2.2, phantomjs 2.1.1, rtmpdump 2.4
[debug] Proxy map: {}
[youtube] i4-Wiokzhik: Downloading webpage
[youtube] i4-Wiokzhik: Downloading MPD manifest
[debug] Invoking downloader on u'https://manifest.googlevideo.com/api/manifest/dash/expire/1588906400/ei/QHW0XsrVDuKFmLAPmZKu2AI/ip/79.176.45.56/id/8b8f968a89338629/source/youtube/requiressl/yes/playback_host/r6---sn-cx1x9-ua8d.googlevideo.com/mh/Wp/mm/31%2C29/mn/sn-cx1x9-ua8d%2Csn-hgn7yn7z/ms/au%2Crdu/mv/m/mvi/5/pl/24/hfr/all/as/fmp4_audio_clear%2Cwebm_audio_clear%2Cwebm2_audio_clear%2Cfmp4_sd_hd_clear%2Cwebm2_sd_hd_clear/initcwndbps/942500/vprv/1/mt/1588884698/fvip/5/keepalive/yes/beids/9466585/itag/0/sparams/expire%2Cei%2Cip%2Cid%2Csource%2Crequiressl%2Chfr%2Cas%2Cvprv%2Citag/sig/AJpPlLswRQIhAP1jQ8gvWUySBFu3uIndQ-64Y_w6KO0-hgHZquke2Yg1AiBIWTra-q_Vs20MsVGvS7Lf4IcRVrc85vjsdvi8nw1FDg%3D%3D/lsparams/playback_host%2Cmh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps/lsig/ALrAebAwRAIgThEacIy1KFGnamCqsfO9euu5JUR11yrtQRVE7YNhSpECIGtcQSbCSwjSjDG_iNC3jaNFveVBtsE6lbVlXoUsG71U'
[dashsegments] Total fragments: 414
[download] Destination: Game Center Live, May 7 2020 - student streams + game industry news roundup with Naomi Clark and Fran-i4-Wiokzhik.webm
[download]  10.1% of ~67.99MiB at  4.91MiB/s ETA 00:40ERROR: unable to download video data: <urlopen error [Errno 110] Connection timed out>
Traceback (most recent call last):
  File "/path/to/youtube-dl/youtube_dl/YoutubeDL.py", line 1926, in process_info
    success = dl(filename, info_dict)
  File "/path/to/youtube-dl/youtube_dl/YoutubeDL.py", line 1865, in dl
    return fd.download(name, info)
  File "/path/to/youtube-dl/youtube_dl/downloader/common.py", line 366, in download
    return self.real_download(filename, info_dict)
  File "/path/to/youtube-dl/youtube_dl/downloader/dash.py", line 48, in real_download
    success, frag_content = self._download_fragment(ctx, fragment_url, info_dict)
  File "/path/to/youtube-dl/youtube_dl/downloader/fragment.py", line 102, in _download_fragment
    'http_headers': headers or info_dict.get('http_headers'),
  File "/path/to/youtube-dl/youtube_dl/downloader/common.py", line 366, in download
    return self.real_download(filename, info_dict)
  File "/path/to/youtube-dl/youtube_dl/downloader/http.py", line 341, in real_download
    establish_connection()
  File "/path/to/youtube-dl/youtube_dl/downloader/http.py", line 109, in establish_connection
    ctx.data = self.ydl.urlopen(request)
  File "/path/to/youtube-dl/youtube_dl/YoutubeDL.py", line 2238, in urlopen
    return self._opener.open(req, timeout=self._socket_timeout)
  File "/usr/lib/python2.7/urllib2.py", line 429, in open
    response = self._open(req, data)
  File "/usr/lib/python2.7/urllib2.py", line 447, in _open
    '_open', req)
  File "/usr/lib/python2.7/urllib2.py", line 407, in _call_chain
    result = func(*args)
  File "/path/to/youtube-dl/youtube_dl/utils.py", line 2728, in https_open
    req, **kwargs)
  File "/usr/lib/python2.7/urllib2.py", line 1198, in do_open
    raise URLError(err)
URLError: <urlopen error [Errno 110] Connection timed out>

Description

When downloading the audio (with flag -x) of youtube videos, sometimes the download freezes after advancing by a few percentages, until it times out, ignoring any settings in --retries and --fragment-retries (it ignored my requests for infinite). Instead of waiting for the timeout to occur (in the above log it froze for several minutes at 10.1%), I resort to Ctrl-C-ing and rerunning the command, letting it advance until it freeze, and running it again.

In a recent attempt to download, youtube-dl tries to download the mp4 file when it froze.
However, in one of my attempts to rerun the command, youtube-dl suddenly decided to download a webm file, which went without a hitch. Is this because youtube suddenly made available a different audio format? I didn't run --list-formats before and after to verify.

There are several issues as I see it:

1. youtube-dl doesn't seem to retry the download, and I have to resort to doing manually.
2. Is it possible to detect this "problematic" state and fall back to download a different format?

[salty-horse]

Sorry, of which bug is this a duplicate? I didn't find anything suitable.