Vireo is a lightweight and versatile video processing library that powers our video transcoding service, deep learning recognition systems and more. It is written in C++11 and built with functional programming principles. It also optionally comes with Scala wrappers that enable us to build scalable video processing applications within our backend services.
在 Tools 的部份也可以看到很多功能，像是：
thumbnails: extracts keyframes from the input video and saves them as JPG images
viddiff: checks if two video files are functionally identical or not (does not compare data that does not affect the playback behavior)
另外要注意的是，預設不會將 GPL 的套件納入編譯，需要指定
The following libraries are disabled by default. To enable GPL licensed components, they have to be present in your system and --enable-gpl flag have to be explicitly passed to
看起來主要就是最常見的那包... (libavformat / libavcodec / libavutil / libswscale / libx264)