Note: After the upstream SharpAvi project adds support for .NET 5/6, no further versions of this unofficial port are planned, and users of this port should strongly consider migrating to the upstream (official) version.
SharpAvi.Net5 (nuget) is a port of SharpAvi (nuget) to .NET 5 and higher (net5-windows). SharpAvi is written by Vasili Maslov. The minor changes done here to port it were done by Eliah Kagan. See README-NET5.md for details about this port.
The original SharpAvi readme follows.
SharpAvi is a simple .NET library for creating video files in AVI format.
If you want to render some video sequence, and do not want to touch DirectShow or depend on command-line utilities - SharpAvi may be what you need. Writing uncompressed AVI does not require any external dependencies, it's pure .NET code. Files are produced in compliance with the OpenDML extensions which allow (nearly) unlimited file size (no 2GB limit).
Video is created by supplying individual in-memory bitmaps (byte arrays) and audio samples. Included are implementations of encoders for Motion JPEG (requires WPF), MPEG-4 (requires external VfW codecs) and MP3 (requires LAME binaries). Output format is always AVI, regardless of a specific codec used. Asynchronous writing/encoding is supported.
To get started, jump to the project's wiki.
Project binaries can also be downloaded as NuGet package.
A bit of history. This project started on CodePlex in 2013. Then the repository was mirrored on GitHub for some time, until the project moved on GitHub completely in the middle of 2017.