Video Converter for .NET (C#) FFMpeg wrapper
http://www.nrecosite.com/video_converter_net.aspx
Document: http://www.nrecosite.com/doc/NReco.VideoConverter/
Nuget: https://www.nuget.org/packages/NReco.VideoConverter/
Install-Package NReco.VideoConverter
原文：http://www.cnblogs.com/niusys/p/4305529.html