[slideslive.com] AssertionError on recent video

[LecJackS]

Checklist

• I'm reporting a broken site support
• I've verified that I'm running youtube-dl version 2020.12.05
• 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 "https://slideslive.com/38935785/" --verbose
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['https://slideslive.com/38935785/', '--verbose']
[debug] Encodings: locale UTF-8, fs utf-8, out utf-8, pref UTF-8
[debug] youtube-dl version 2020.12.05
[debug] Python version 3.8.3 (CPython) - Linux-5.4.0-56-generic-x86_64-with-glibc2.10
[debug] exe versions: ffmpeg 4.3.1
[debug] Proxy map: {}
[SlidesLive] 38935785: Downloading JSON metadata
Traceback (most recent call last):
  File "/home/jack/miniconda3/lib/python3.8/runpy.py", line 194, in _run_module_as_main
    return _run_code(code, main_globals, None,
  File "/home/jack/miniconda3/lib/python3.8/runpy.py", line 87, in _run_code
    exec(code, run_globals)
  File "/usr/local/bin/youtube-dl/__main__.py", line 19, in <module>
  File "/usr/local/bin/youtube-dl/youtube_dl/__init__.py", line 474, in main
  File "/usr/local/bin/youtube-dl/youtube_dl/__init__.py", line 464, in _real_main
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 2028, in download
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 796, in extract_info
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 803, in wrapper
  File "/usr/local/bin/youtube-dl/youtube_dl/YoutubeDL.py", line 824, in __extract_info
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/common.py", line 532, in extract
  File "/usr/local/bin/youtube-dl/youtube_dl/extractor/slideslive.py", line 42, in _real_extract
AssertionError

Description

The video I'm trying to download is pretty recent, but if I try another one, it works perfectly:

Do not work (Dec 6, 2020): https://slideslive.com/38935785

Works fine (Jun 14, 2019): https://slideslive.com/38917858

So maybe it has something to do with it.

Verbose log for the working link:

$ youtube-dl "https://slideslive.com/38917858" --verbose
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['https://slideslive.com/38917858', '--verbose']
[debug] Encodings: locale UTF-8, fs utf-8, out utf-8, pref UTF-8
[debug] youtube-dl version 2020.12.05
[debug] Python version 3.8.3 (CPython) - Linux-5.4.0-56-generic-x86_64-with-glibc2.10
[debug] exe versions: ffmpeg 4.3.1
[debug] Proxy map: {}
[SlidesLive] 38917858: Downloading JSON metadata
[youtube] X5g1a6Lqtjc: Downloading webpage
[youtube] X5g1a6Lqtjc: Downloading MPD manifest
[debug] Default format spec: bestvideo+bestaudio/best
[debug] Invoking downloader on 'https://manifest.googlevideo.com/api/manifest/dash/expire/1607296482/ei/ghHNX9rZLc-V1sQP4vmm8AU/ip/2803%3A9800%3Aa016%3A8e05%3Aa900%3A97d1%3Af68%3Ac43b/id/5f98356ba2eab637/source/youtube/requiressl/yes/playback_host/r3---sn-jup-x1xs.googlevideo.com/mh/FL/mm/31%2C29/mn/sn-jup-x1xs%2Csn-x1x7zn7e/ms/au%2Crdu/mv/m/mvi/3/pl/48/tx/23947680/txs/23947679%2C23947680%2C23947681%2C23947682%2C23947683/hfr/all/as/fmp4_audio_clear%2Cwebm_audio_clear%2Cwebm2_audio_clear%2Cfmp4_sd_hd_clear%2Cwebm2_sd_hd_clear/initcwndbps/587500/vprv/1/mt/1607274281/fvip/5/keepalive/yes/itag/0/sparams/expire%2Cei%2Cip%2Cid%2Csource%2Crequiressl%2Ctx%2Ctxs%2Chfr%2Cas%2Cvprv%2Citag/sig/AOq0QJ8wRQIgKJJfvo1OaBcJ6HoJkBWpKiBWbVkHhO5I8wsxvfT2lb8CIQCnhaq3UrPIiqWgDYdjRBcsBIp6Cp7eLNTR1TankQ1QVQ%3D%3D/lsparams/playback_host%2Cmh%2Cmm%2Cmn%2Cms%2Cmv%2Cmvi%2Cpl%2Cinitcwndbps/lsig/AG3C_xAwRQIgQ_0AaSgvRFnNpYB3l-qYJQLVnxZSSiiDwXy0YpHBWS8CIQDYeEbn1FiUEOS_Vat49JKbcUwe0QUKVoikauALmO63wg%3D%3D'
[dashsegments] Total fragments: 327
[download] Destination: Personalized Visualization of the Impact of Climate Change-X5g1a6Lqtjc.f137.mp4
[download]   1.2% of ~435.12MiB at  6.12MiB/s ETA 06:59^C
ERROR: Interrupted by user

[LecJackS]

Today the log is a little bit different:

$ youtube-dl "slideslive.com/38935785/" --verbose
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['slideslive.com/38935785/', '--verbose']
[debug] Encodings: locale UTF-8, fs utf-8, out utf-8, pref UTF-8
[debug] youtube-dl version 2020.12.05
[debug] Python version 3.8.3 (CPython) - Linux-5.4.0-56-generic-x86_64-with-glibc2.10
[debug] exe versions: ffmpeg 4.3.1
[debug] Proxy map: {}
WARNING: The url doesn't specify the protocol, trying with http
[SlidesLive] 38935785: Downloading JSON metadata
Traceback (most recent call last):
  File "/home/jack/miniconda3/bin/youtube-dl", line 8, in <module>
    sys.exit(main())
  File "/home/jack/miniconda3/lib/python3.8/site-packages/youtube_dl/__init__.py", line 474, in main
    _real_main(argv)
  File "/home/jack/miniconda3/lib/python3.8/site-packages/youtube_dl/__init__.py", line 464, in _real_main
    retcode = ydl.download(all_urls)
  File "/home/jack/miniconda3/lib/python3.8/site-packages/youtube_dl/YoutubeDL.py", line 2028, in download
    res = self.extract_info(
  File "/home/jack/miniconda3/lib/python3.8/site-packages/youtube_dl/YoutubeDL.py", line 796, in extract_info
    return self.__extract_info(url, ie, download, extra_info, process)
  File "/home/jack/miniconda3/lib/python3.8/site-packages/youtube_dl/YoutubeDL.py", line 803, in wrapper
    return func(self, *args, **kwargs)
  File "/home/jack/miniconda3/lib/python3.8/site-packages/youtube_dl/YoutubeDL.py", line 835, in __extract_info
    return self.process_ie_result(ie_result, download, extra_info)
  File "/home/jack/miniconda3/lib/python3.8/site-packages/youtube_dl/YoutubeDL.py", line 873, in process_ie_result
    return self.extract_info(ie_result['url'],
  File "/home/jack/miniconda3/lib/python3.8/site-packages/youtube_dl/YoutubeDL.py", line 796, in extract_info
    return self.__extract_info(url, ie, download, extra_info, process)
  File "/home/jack/miniconda3/lib/python3.8/site-packages/youtube_dl/YoutubeDL.py", line 803, in wrapper
    return func(self, *args, **kwargs)
  File "/home/jack/miniconda3/lib/python3.8/site-packages/youtube_dl/YoutubeDL.py", line 824, in __extract_info
    ie_result = ie.extract(url)
  File "/home/jack/miniconda3/lib/python3.8/site-packages/youtube_dl/extractor/common.py", line 532, in extract
    ie_result = self._real_extract(url)
  File "/home/jack/miniconda3/lib/python3.8/site-packages/youtube_dl/extractor/slideslive.py", line 42, in _real_extract
    assert service_name in ('url', 'vimeo', 'youtube')
AssertionError