$30 - Download videos from YouTube in browser (without backend)

I need a simple website that downloads youtube videos and uploads it to [Sia Skynet](https://siasky.net/).

I'm sure, uploading won't be a problem (it is possible with the Skynet SDK, contact me for help), downloading the video is the challenge. I know from the command line `youtube-dl` does a very good job, but we need to do it in the browser (most of the youtube downloader webpages are using backend for downloading, but I would like to do it in the browser.) Would be great to transfer 360p, 720p, 1080p, and 4k resolutions as well if it is available for the given video and get the video title, description, upload timestamp, thumbnail also for the video.

*Update 1*
- Video download helper can find the URL of the raw video file on Youtube: https://siasky.net/fAU3sga05JZoElvhIddwqkH8-aEYVEptFdnq6g6PvYwXrA
- VLC can find it also (and is open source), you need to do the same just in the browser: https://siasky.net/_AKNWmUoh3_J-eZVvPiZsFGIRhNiUjDSaefE3Iil2k3qTw
- You don't need to convert video files, just transfer it to https://siasky.net.
- You don't need to combine video and audio if. If youtube gives separate files, it is okay.

Contact me on Discord: https://discord.gg/ewVgQB4