Add uscreen.tv support

[porjo]

Checklist

• I'm reporting a new site support request
• I've verified that I'm running youtube-dl version 2019.04.30
• I've checked that all provided URLs are alive and playable in a browser
• I've checked that none of provided URLs violate any copyrights
• I've searched the bugtracker for similar site support requests including closed ones

Example URLs

This URL is the container where the video player sits:
https://www.unauthorized.tv/programs/live-on-stage?cid=201227

When the user clicks play a POST is sent to this URL with JSON payload (plus various session headers):
https://www.unauthorized.tv/stats/play

{"video_id":"211831","chapter_id":"201227","started":true}

Description

Uscreen.tv is a video hosting platform where the content owner can skin the interface and use their own domain name. Videos can be protected by login (the URL supplied above is not) in which case the user must first sign in at: https://<custom domain>/sign_in

[jacksun2212]

Hi. Any update on getting youtube-dl to work with UScreen? I tried --cookies but it still didn't work.