That's the page where NBC Sports lists their livestreams. The page is constantly changing depending on what events may be occurring at any given moment. They also list what they have on their schedule for the next few days. The Golf Channel livestreams are listed there since Golf Channel is part of NBC. There is nothing live going on at the moment I am writing this. But later today there will be golf from several different tours, car racing, soccer, rugby, & college football. Looking further down the page I see sports talk shows, an NFL game, motorcycle racing, & figure skating. During the Olympics, they had countless links to various events. They also carry Peacock programming, but that's behind its own paywall so that's essentially a separate category. The trick is, they require you to authorize access through your cable TV provider. Since I am in the US & I subscribe to a cable system, I can get into any of the streams offered there. Then I can record them with VDH & make sure not to accidentally learn the outcome of the game before I play back my MP4 recorded by VDH. If you live elsewhere, you probably can't get access to this content.
That is a site that is not restricted. You can live anywhere & get in there. You do need to register a user ID & password with them, but that is totally free. They do have a lot of their content behind a paywall, but most (not all) of their livestreams are available to anybody who has one of their free accounts. VDH works quite well on that site.
As for my local network TV affiliates, they are here:
Those are unlikely to be of any use to anybody who does not have a cable TV subscription in the US. I don't know if a subscription to any cable system in the US would work or if you have to actually be here. Since I'm here, I'm unable to experiment with that. Maybe somebody in another city reading this can try it & report how it goes.
On the subject of ffmpeg, I'm not going to spoonfeed you. You will have to do some learning on your own. I have posted a tutorial on ffmpeg in this forum. If you are sufficiently motivated, you will read it. I will, however, spoonfeed you how to find that tutorial. Click this:
Within that page, do a text search with "cannot download" as your search key. That will reposition the page on a reference that contains a link. Click that link. Read what you find. If you are sufficiently patient & motivated, that tutorial will teach you how to use ffmpeg in cases that VDH fails to do the download. Not all cases. There are things that simply can't be downloaded. But there are many cases in which VDH fails but ffmpeg succeeds. It's up to you whether you wish to make the effort to learn what is there.
VDH has its uses. You just need to be sufficiently insightful to recognize its usefulness. You are, of course, free to move on to other tools & other topics.