Downie downloader is an app and a browser extension. In my experience, it’s the easiest and fastest video and image downloader, with a huge database of video sites. The developer is responsive and friendly, and is constantly updating the app. It’s my “go-to” app when I want to download a video from almost any site I come across (including the BBC).
The Downie site is here:
I have no connection to the developer, I’m just a very satisfied user. Yes, it’s a paid app, but it still functions quite well in the free mode.
Here’s an enthusiastic review. It’s a bit old (Feb 2, 2014), but the fact that Downie is still around and still being regularly updated is no small feat for a one-person shop.