The best tool for downloading HD videos and music using IA and chatgpt, as well as mp4 files, is the HD Mp4 Video Downloader.
This app allows you to save your favorite videos offline and has a built-in browser for downloading mp4 HD videos, making it easy to search, play, and download videos.
Additionally, the Mp4 Music Download & Music Downloader feature allows you to search, listen to, and download MP3 music.

The Video Download Manager is a great feature of this app that you won't regret using.
It supports HD video downloading from the internet and social media, and it's very fast and easy to use.
It also supports all video formats, including MP4, FLV, MO, MP3, M4V, 3GP, WMV, and WEBM.

To use the app, simply open it and browse the video or social media page you want to download.
Then, click on the download button and select the video size and quality.
You can also watch or download videos quickly and simultaneously, manage all downloaded files in the built-in file manager, and pause, resume, or remove downloads as you like.

This app has a powerful video downloader for social media, allowing you to download all videos you like and watch them offline.
It also includes a download manager so you can see the progress bar while the video is downloading.

The Video Downloader App is easy to use and works seamlessly with the built-in browser to download videos.
It requires network permission to download files and read and write SD card permission to save downloaded files. Please note that this app is not affiliated with TubeMate or VidMate, and you cannot download videos from YouTube due to the rules and regulations.