Add support for Telegram (t.me)

[jasomdotnet]

• I'm reporting a new site support request
• I've verified that I'm running youtube-dl version 2019.11.28
• 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 (yes, nothing)

Example URLs

• Single video: https://t.me/police_frequency/19788
• Single video: https://t.me/police_frequency/19676

Description

Hi, add support for Telegram. It's social network with more then 200 million users. See this press release: https://telegram.org/blog/200-million Twitter or Instagram is similar service like Telegram.

[sergey-rufanov]

Telegram is not video streaming website, Telegram is not a social network, Telegram is a instant messaging system, with it's own transport protocol.

You can't watch videos by just clicking on "t.me/xxx" link, because there is no video streaming on t.me website - all video's accessible only using telegram protocol(you must have installed client, or use web-client), not directly via http(-s).

Implementing this is different from main goal and current architecture of YouTube-dl, also it requires adding some pretty huge Telegram client library to youtube-dl dependencies(like Telethon or pyrogram).

Also, I think, it's don't have any practical purpose - inside telegram you can literally just right-click and select "download" on any video - there is no any downloading restriction's like on streaming websites.

[jasomdotnet]

Also, I think, it's don't have any practical purpose - inside telegram you can literally just right-click and select "download" on any video - there is no any downloading restriction's like on streaming websites.

I found out this later.

[jasomdotnet]

Leaving this open if anybody wants to add additional comments