4KDownload

4K Download is a range of shareware, cross-platform programs developed by Open Media LLC, a company based in Nizhny Novgorod, Russia. All applications run on Mac, Windows and Linux. 4K Download allows users to download videos and audio from video hosting sites such as YouTube, Facebook and Vimeo, make a photo backup from Instagram, create and publish slideshows and extract audio from video. The name of the project refers to the name of the video resolution of 4K.
Programs.
4K Download contains 5 programs:
Relations with open source.
Applications use open source libraries and frameworks: Qt, FFmpeg, boost. Before version 3, it was available as open source software.
Video Downloader.
4K Video Downloader is multi-platform software for downloading video and audio from popular websites YouTube, Vimeo, Dailymotion, Facebook, Flickr, and Metacafe. It supports the following output formats: MP4, MKV, OGG Theora, MP3, M4A. The program allows a user to download channels, playlists, and subtitles, as well as a subscription function, which auto-downloads new videos as they are released on a user-specified YouTube channel.
Development.
4K Video Downloader was originally developed in the programming language C++ with Qt framework using libraries such as Boost, FFmpeg, OpenCV, OpenSSL, LAME, and PortAudio.