Download audio (MP3) and video (MP4) files from YouTube URLs. Use when users want to convert YouTube videos to files, extract music/songs, download videos for offline viewing, save educational content, or process playlists. Handles single videos, playlists, and batch downloads with quality options.

从 YouTube 链接下载音频（MP3）和视频（MP4）文件，适用于用户将 YouTube 视频转换为文件、提取音乐、下载离线观看视频、保存教育内容或处理播放列表，支持单个视频、播放列表和批量下载，并提供多种画质选项