ERROR: This video is only available for registered users, use --username and --password options to provide account credentials.

[AbhimanyuAryan]

i generally use youtube-dl -t to download any video. What should be the command with credentials to download this video?

[phihag]

The -t option doesn't do anything nowadays, so you can drop it right away.

Use youtube-dl --username YOUR_USERNAME --password YOUR_PASSWORD to sign in to a service.

[BETLOG]

I just got the same error attempting to download facebook videos that are public.
I have downloaded hundreds of videos like this and never had a login requirement before.
It's possible the hong-kong context is related, but the fact that I can watch and not download them is weird.

ERROR: This video is only available for registered users. Use --username and --password or --netrc to provide account credentials.

https://www.facebook.com/jovan.ferraz/videos/465222417443406/
https://www.facebook.com/jovan.ferraz/videos/465222527443395/

I get the same failure on:
Kubuntu 18.04
youtube-dl --version
2019.10.22
2019.11.05

Kubuntu 14.04
youtube-dl --version
2019-07-16

[cswjohnni]

for facebook private video, you have to use the .netrc file, the file would contains as following:

machine facebook
login xxxxx (here is your facebook login ID/username)
password xxxxx (here is your facebook login password)

the .netrc file should be in your home folder, for example Apple$
use ls -a to see if the .netrc file is there

then, use the command
youtube-dl https://www.facebook.com/xxxx (here is your facebook video link URL) --netrc