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I get the following error when I try to download video using youtube-dl.

WARNING: Warning: Falling back to static signature algorithm
ERROR: unable to download video data: HTTP Error 403: Forbidden
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did you try the updated version. Try running sudo youtube-dl -U to update it – Stormvirux Jul 11 '14 at 11:53
yes i have tried the updated version still doesn't work – abhi Jul 11 '14 at 12:30
I suggest you to install DownloadHelper in firefox. It is fast and effective. CLI takes a long time! – A Umar Mukthar Sep 11 '14 at 12:46
Possible duplicate of Cannot update youtube-dl – David Foerster Jan 15 at 2:58
up vote 10 down vote accepted

Did you installed via apt-get? It seems this version is outdated. This was happening to me:

$ sudo youtube-dl -U
It looks like you installed youtube-dl with a package manager, pip, or a tarball. Please use that to update.

I downloaded from the official website and now it works, no more error 403 :)

$ sudo youtube-dl -U
youtube-dl is up-to-date (2014.09.10.1)
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The solutions above didn't work for me. I used the following commands from the official youtube-dl website.

Use wget:

sudo wget -O /usr/local/bin/youtube-dl

sudo chmod a+x /usr/local/bin/youtube-dl

This fixed it for me.

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This is how youtube-dl should always be downloaded, in my opinion – geoffmcc Jan 1 '15 at 14:41

Those facing new problems with the youtube-dl with this error Warning: Falling back to static signature algorithm should first install python-pip with sudo apt-get install python-pip (if they have not already installed it, of course) and then use sudo pip install youtube-dl --upgrade to fix the error.

This is what worked for me this morning (as at the time of posting this answer).

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Install pip-python if you haven't already, then type :

sudo pip install --upgrade youtube_dl

This fixes the problem all right.

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Following fixed the issue. It is now working beautifully.

$ sudo apt-get install yasm
$ git clone git://
$ cd libav
$ ./configure
$ make
$ sudo make install


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-1 How is the installation of an upstream version of avconv from source going to alleviate a networking issue of youtube-dl? O.o – David Foerster Jan 15 at 2:57

Try to clear youtube-dl cache:

youtube-dl --rm-cache-dir


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I downloaded youtube-dl from I then did a chmod 777 youtube-dl, and ran the command. It asked me to upgrade via ./youtube-dl -U which upgraded me to the version 2015.12.13. I ran ./youtube-dl with the URL again and the problem had been solved.

Trying a pip upgrade on the default pip installation of youtube-dl did not do the upgrade or solve the problem, indicating that the pypi version might be outdated on bug fixes.

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