Repository: youtube-dl
Issue: Udemy - No video formats found
Labels: broken-IE,account-needed

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## Checklist

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Carefully read and work through this check list in order to prevent the most common mistakes and misuse of youtube-dl:
- First of, make sure you are using the latest version of youtube-dl. Run `youtube-dl --version` and ensure your version is 2021.06.06. If it's not, see https://yt-dl.org/update on how to update. Issues with outdated version will be REJECTED.
- Make sure that all provided video/audio/playlist URLs (if any) are alive and playable in a browser.
- Make sure that all URLs and arguments with special characters are properly quoted or escaped as explained in http://yt-dl.org/escape.
- Search the bugtracker for similar issues: http://yt-dl.org/search-issues. DO NOT post duplicates.
- Read bugs section in FAQ: http://yt-dl.org/reporting
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- [x] I'm reporting a broken site support issue
- [x] I've verified that I'm running youtube-dl version **2021.06.06**
- [ ] 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
- [x] I've read bugs section in FAQ


## Verbose log

<!--
Provide the complete verbose output of youtube-dl that clearly demonstrates the problem.
Add the `-v` flag to your command line you run youtube-dl with (`youtube-dl -v <your command line>`), copy the WHOLE output and insert it below. It should look similar to this:
 [debug] System config: []
 [debug] User config: []
 [debug] Command-line args: [u'-v', u'http://www.youtube.com/watch?v=BaW_jenozKcj']
 [debug] Encodings: locale cp1251, fs mbcs, out cp866, pref cp1251
 [debug] youtube-dl version 2021.06.06
 [debug] Python version 2.7.11 - Windows-2003Server-5.2.3790-SP2
 [debug] exe versions: ffmpeg N-75573-g1d0487f, ffprobe N-75573-g1d0487f, rtmpdump 2.4
 [debug] Proxy map: {}
 <more lines>
-->

```
./youtube-dl.exe --cookies udemy.com_cookies.txt --verbose -o '~/udemy-blockchain/%(playlist)s/%(chapter_number)s - %(chapter)s/%(title)s.%(ext)s' https://www.udemy.com/blockchain-developer/
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['--cookies', 'udemy.com_cookies.txt', '--verbose', '-o', '~/udemy-blockchain/%(playlist)s/%(chapter_number)s - %(chapter)s/%(title)s.%(ext)s', 'https://www.udemy.com/blockchain-developer/']
[debug] Encodings: locale cp1251, fs mbcs, out cp866, pref cp1251
[debug] youtube-dl version 2021.06.06
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.19041
[debug] exe versions: none
[debug] Proxy map: {}
[udemy:course] blockchain-developer: Downloading webpage
[udemy:course] 1172526: Downloading course curriculum
[download] Downloading playlist: 1172526
[udemy:course] playlist 1172526: Collected 121 video ids (downloading 121 of them)
[download] Downloading video 1 of 121
[udemy] 6846516: Downloading webpage
[udemy] 6846516: Downloading lecture JSON
[udemy] 22610630: Downloading m3u8 information
[debug] Default format spec: best/bestvideo+bestaudio
[debug] Invoking downloader on 'https://www.udemy.com/assets/22610630/files/2020-03-01_13-29-53-b1af010e8a29298d952aba5ea685043c/2/hls/AVC_1920x1080_6400k_AAC-HE_64k/aa001a1334874de0b44acad3189eaa6dcf6d.m3u8?provider=cloudfront&token=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJleHAiOjE2MzExMTU1ODEsInBhdGgiOiIyMDIwLTAzLTAxXzEzLTI5LTUzLWIxYWYwMTBlOGEyOTI5OGQ5NTJhYmE1ZWE2ODUwNDNjLzIvIn0._UTSi-fQLDZ_1hqKWRHOvwgtlva7Ljmp0myUtGBX5ic&v=1'
[hlsnative] Downloading m3u8 manifest
[hlsnative] Total fragments: 50
[download] Destination: C:\Users\user\udemy-blockchain\1172526\1 - A Quick Introduction into the Course\Quick Introduction Before Commencing With This Course.mp4
[download] 100% of 209.59MiB in 00:17
WARNING: 22610630: malformed AAC bitstream detected. Install ffmpeg or avconv to fix this automatically.
[download] Downloading video 2 of 121
[udemy] 6846544: Downloading webpage
[udemy] 6846544: Downloading lecture JSON
ERROR: No video formats found; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpkqxnwl31\build\youtube_dl\YoutubeDL.py", line 815, in wrapper
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpkqxnwl31\build\youtube_dl\YoutubeDL.py", line 836, in __extract_info
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpkqxnwl31\build\youtube_dl\extractor\common.py", line 534, in extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpkqxnwl31\build\youtube_dl\extractor\udemy.py", line 408, in _real_extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpkqxnwl31\build\youtube_dl\extractor\common.py", line 1374, in _sort_formats
youtube_dl.utils.ExtractorError: No video formats found; please report this issue on https://yt-dl.org/bug . Make sure you are using the latest version; type  youtube-dl -U  to update. Be sure to call youtube-dl with the --verbose flag and include its complete output.
```


## Description

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I'm trying to download video from udemy, 1st video downloads normal, but after that I got the error