Repository: youtube-dl
Issue: Downloading of a live video from ceskatelevize.cz stopped to work
Labels: broken-IE

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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 2021.12.17. 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 Issues with outdated version will be REJECTED.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.
- Finally, put x into all relevant boxes (like this [x])
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- [x ] I'm reporting a broken site support
- [x ] I've verified that I'm running youtube-dl version **2021.12.17**
- [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 issues including closed ones


## 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 2021.12.17
 [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>
-->

```
e:\PETR\FILMY\POM>youtube-dl.exe https://www.ceskatelevize.cz/porady/14890395001-spolecne-koreny-koncert-s-ukrajinou/ --verbose
[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['https://www.ceskatelevize.cz/porady/14890395001-spolecne-koreny-koncert-s-ukrajinou/', '--verbose']
[debug] Encodings: locale cp1250, fs mbcs, out cp852, pref cp1250
[debug] youtube-dl version 2021.12.17
[debug] Python version 3.4.4 (CPython) - Windows-10-10.0.19041
[debug] exe versions: ffmpeg N-91146-gfe84f70819-vdhcoapp, ffprobe N-91146-gfe84f70819-vdhcoapp
[debug] Proxy map: {}
[CeskaTelevizePorady] 14890395001-spolecne-koreny-koncert-s-ukrajinou: Downloading webpage
ERROR: Unable to extract iframe player url; 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\tmpupik7c6w\build\youtube_dl\YoutubeDL.py", line 815, in wrapper
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpupik7c6w\build\youtube_dl\YoutubeDL.py", line 836, in __extract_info
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpupik7c6w\build\youtube_dl\extractor\common.py", line 534, in extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpupik7c6w\build\youtube_dl\extractor\ceskatelevize.py", line 285, in _real_extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\ytdl-org\tmpupik7c6w\build\youtube_dl\extractor\common.py", line 1012, in _search_regex
youtube_dl.utils.RegexNotFoundError: Unable to extract iframe player url; 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.


e:\PETR\FILMY\POM>
```


## Description

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WRITE DESCRIPTION HERE
Czech TV has its web. Some videos on the web are playable only in a time of broadcasting of the same program. It was possible to download these videos without problem during the broadcasting. The Czech TV changed its web and now I am not able to download it. Please, could you look at it and modify the program?
Regards
Jim