ejcornelioec-cell/yt-dlp ? reverse-engineered prompt

Build me a command line tool that lets me download videos or just the audio from a lot of different websites, with the same kind of flexibility people expect from yt dlp.

I want it to feel reliable and practical, so someone can paste in a link and get a clean download, choose the format they want, extract audio if needed, and save files with sensible names. It should also handle common extras like subtitles, thumbnails, metadata, and basic playlist support. Make sure it works well on Windows, Mac, and Linux, and include a simple way to install or run it from the terminal.

Please keep it polished, with clear help text, good defaults, and solid error handling when a site changes or a download fails. If you need to check current docs or site behavior, look it up online.