Well, I myself tried out several Video Downloader before. And I also used those handy sites which give you certain words to add before a video so it starts getting downloaded. But you know what?
Those sites always come up with limited features. I remember I used to download YouTube videos with one downloader and to extract Audio from it, I had to opt for another downloader. Now I am using a simplist twitter downloader https://downloadtwittervideo.online/