I am not able to extract a 1080P video's format

[KwToPA]

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 that [x])
• Use Preview tab to see how 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 2016.04.19. 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 Issues with outdated version will be rejected.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 2016.04.19

Before submitting an issue make sure you have:

• At least skimmed through README and most notably FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)

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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 -v flag to your command line you run youtube-dl with, copy the whole output and insert it here. It should look similar to one below (replace it with your log inserted between triple ```):

proxychains4 youtube-dl -f https://www.youtube.com/watch?v=V6GuAZKoNQc
[proxychains] config file found: /usr/local/Cellar/proxychains-ng/4.7/etc/proxychains.conf
[proxychains] preloading /usr/local/Cellar/proxychains-ng/4.7/lib/libproxychains4.dylib
[proxychains] DLL init
[proxychains] DLL init
[proxychains] DLL init
Usage: youtube-dl [OPTIONS] URL [URL...]

youtube-dl: error: You must provide at least one URL.
Type youtube-dl --help to see a list of all options.

[yan12125]

By default youtube-dl downloads the format with best quality. There's no need to use -f. Note that for this video you need to install ffmpeg or avconv to get 1080P.

[Hrxn]

Moreover, using the -f switch without any argument doesn't make sense.
See here

-f, --format FORMAT

FORMAT is format code, etc. pp.