As promised here are all the planned webcasts of today’s TSE I could find so far:

https://www.youtube.com/watch?v=vmVLIDq9wok (Time and Date)

https://www.youtube.com/watch?v=y4JclgJLrJY (Slooh)

https://www.youtube.com/watch?v=zEHcZE4qcDE (CosmoSapiens)

have already fixed URLs for their feeds (but also check one level up in case of last-minute changes),

https://www.nasa.gov/nasalive

links to two continuous NASA feeds (not special for the eclipse),

https://www.youtube.com/exploratorium

https://www.youtube.com/c/Astrof%C3%ADsicaUC

https://www.youtube.com/channel/UChui2PyAff1-vZfBCWM1-kQ

https://www.youtube.com/channel/UCj1M4gN7iXUv5D7D53ZgP1g

http://www.rtnweb.gob.ar/tv/

have promised to provide feeds at some point and

https://carnegiescience.edu/events/lectures/total-solar-eclipse-2020

invites to a Zoom conference. Largely overlapping lists of webcasts are e.g. at

http://time.unitarium.com/events/eclipse/122020/live.html

https://www.duluthnewstribune.com/astro-bob/6799813-Astro-Bob-Watch-the-Dec.-14-total-solar-eclipse-from-home

https://www.forbes.com/sites/jamiecartereurope/2020/12/11/total-solar-eclipse-live-how-you-can-watch-the-most-spectacular-eclipse-of-all-live-online/

while in

https://skyweek.wordpress.com/2020/12/14/die-totale-sofi-heute-aus-der-ferne-gesehen

and on

https://twitter.com/cosmos4u

I intend to continuously draw attention to actually working webcasts (many originate in Chile where – see e.g. https://www.facebook.com/SpaceX2000/posts/234919934717948 – the weather situations remains volatile) and to pictures appearing on social media, from about 15:30 UTC onwards; totality in South America lasts from about 16:00 to 16:25 UTC.