How to caption YouTube Livestreams?

Question

YouTube is offering the possibility to send captions in a livestream as documented here. However, this guide refers to a link from Youtube Studio Classic, which is no longer existent. In the new Live Control Room, I can only find a link for subtitles which looks like

http://upload.youtube.com/closedcaption?cid=....

and does not contain the parameters like ns or sparams.

How can I provide captions with the Live Control Room? There is also some misleading information on other pages - can I just use a simple HTTP POST or do I need to buy one of the supported softwares?

If it is not possible using POST, can I use the Livestreaming API for that?

Answer 1

It works for me using below python code.

import time
import requests
from datetime  import datetime

word = "this is caption " + str(seq)

ytlink = "http://upload.youtube.com/closedcaption?cid=xxx-xxx-xxx-xxx="+str(seq)

post_fields = datetime.utcnow().strftime('%Y-%m-%dT%H:%M:%S.%f')[:-3] + ' \n' + word + '\n' 

headers = {'content-type': 'text/plain'}
r = requests.post(url=ytlink, data=post_fields.encode('utf-8'), headers=headers)
 
print(ytlink)
print(r.text)

Basically, others won't be required anymore.