FFLib.NET 是 ffmpeg 的 .NET 封装库。可免费使用，源码需要付费（付费信息请看官方首页）。
主要特性：
fully c# managed NET 2.0 library
simple and easy to use object model
properties for setting video and audio conversion parameters
you can disable audio or video stream
you can use fflib for audio conversion only
single threaded at this time
this is first alpha version
source code available
free for personal and commercial use
available full support for developers
free future updates for registered users
项目主页：http://www.intuitive.sk/fflib/
来自:开源中国社区
