You can use node in BAS >
https://www.npmjs.com/package/ffmetadata
or you can use ffmpeg with BAS over "Run proccess" action
Instead of clicking on download button you have to take download link.
You can do that with "get element atribute", and as atribute use href.
Than use that link in "Download" action. There you have to define
full download file path along with downloaded file name and extension.
So you can define your desirable folder.