FFMpegSharp is a great way to use FFMpeg encoding when writing video applications, client-side and server-side. It has wrapper methods that allow conversion to all web formats: MP4, OGV, TS and methods of capturing screens from the videos.
You need to decode, encode or do some processing stuff on multimedia streams, files or whatever mencoder can read? You want to implement your solution in C# or some other .net language? Here you are! This is an assembly which wrappes calls to e.g. reencode some source with a other codec.
VideoUltimate is the fastest and easiest .NET Video Reader and Thumbnailer which can read any video file format on the planet.
It supports .NET Core 2.0+ and .NET Framework 4.0+ web/console/desktop applications.
It allows you read a video file frame by frame or generate meaningful thumbnails.