I build Vidkap, a video downloader app for Android and a video downloader extension for Chrome. Both do the same job: find the videos a web page actually loads and save them as a normal file you can keep. A plain MP4 link is easy.
Source: [Dev.to](https://dev.to/fcsapps/building-a-video-downloader-app-in-flutter-without-ffmpeg-4i6j)