Failed to download live youtube video

[Visitor69]

Please follow the guide below

• You will be asked some questions and requested to provide some information, please read them carefully and answer honestly
• Put an x into all the boxes [ ] relevant to your issue (like this: [x])
• Use the Preview tab to see what your issue will actually look like

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Make sure you are using the latest version: run youtube-dl --version and ensure your version is 2018.09.10. If it's not, read this FAQ entry and update. Issues with outdated version will be rejected.

• I've verified and I assure that I'm running youtube-dl 2018.09.10

Before submitting an issue make sure you have:

• At least skimmed through the README, most notably the FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones
• Checked that provided video/audio/playlist URLs (if any) are alive and playable in a browser

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
• Question
• Other

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The following sections concretize particular purposed issues, you can erase any section (the contents between triple ---) not applicable to your issue

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If the purpose of this issue is a bug report, site support request or you are not completely sure provide the full verbose output as follows:

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 here. It should look similar to one below (replace it with your log inserted between triple ```):

This is an output I got, trying to download a video that played fine in a browser:

C:\Users\Vitali>youtube-dl https://www.youtube.com/watch?v=GbWMw249xY8
[youtube] GbWMw249xY8: Downloading webpage
[youtube] GbWMw249xY8: Downloading video info webpage
[youtube] GbWMw249xY8: Extracting video information
[youtube] GbWMw249xY8: Downloading js player vflkUTZn2
ERROR: Signature extraction failed: Traceback (most recent call last):
File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmp0wqp9d0n\build\youtube_dl\extractor\youtube.py", line 1191, in _decrypt_signature
File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmp0wqp9d0n\build\youtube_dl\extractor\youtube.py", line 1102, in _extract_signature_function
File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmp0wqp9d0n\build\youtube_dl\extractor\youtube.py", line 1163, in _parse_sig_js
File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmp0wqp9d0n\build\youtube_dl\extractor\common.py", line 796, in _search_regex
youtube_dl.utils.RegexNotFoundError: Unable to extract Initial JS player signature function name; 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.
(caused by RegexNotFoundError('Unable to extract Initial JS player signature function name; 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.',)); 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.

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### If the purpose of this *issue* is a *site support request* please provide all kinds of example URLs support for which should be included (replace following example URLs by **yours**):
- Single video: https://www.youtube.com/watch?v=BaW_jenozKc
- Single video: https://youtu.be/BaW_jenozKc
- Playlist: https://www.youtube.com/playlist?list=PL4lCao7KL_QFVb7Iudeipvc2BCavECqzc

Note that **youtube-dl does not support sites dedicated to [copyright infringement](https://github.com/rg3/youtube-dl#can-you-add-support-for-this-anime-video-site-or-site-which-shows-current-movies-for-free)**. In order for site support request to be accepted all provided example URLs should not violate any copyrights.

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### Description of your *issue*, suggested solution and other information

Explanation of your *issue* in arbitrary form goes here. Please make sure the [description is worded well enough to be understood](https://github.com/rg3/youtube-dl#is-the-description-of-the-issue-itself-sufficient). Provide as much context and examples as possible.
If work on your *issue* requires account credentials please provide them or explain how one can obtain them.

[Visitor69]

What is "Invalid"?? I have the latest version of Youtube-dl. Go try downloading https://www.youtube.com/watch?v=GbWMw249xY8 and tell me if you could do that!

[dstftw]

Bother to read the issue template with eyes and compare version in your verbose log.