thisal-d/pytube-downloader — reverse-engineered prompt

Build me a simple desktop app in Python for downloading YouTube videos and playlists. I want it to feel modern and easy to use, with a clean GUI where someone can paste a YouTube link, choose single video or playlist mode, pick a format like MP4 or MP3, choose quality from low resolution up to 8K when available, and start the download with clear live progress.

Please include support for multiple downloads at the same time, saved default settings for format, quality, and download folder, and automatic file organization by playlist, quality, or media type. It should also have keyboard shortcuts, basic download history, and multi language support if that is already part of the project direction. Use FFmpeg for audio and video processing where needed.

Make it runnable from the main entry point, and handle setup so dependencies and FFmpeg are easy to install. If anything is unclear, look up the current docs online and make sensible choices that match a polished YouTube downloader app.