VMX is video codec designed for very high encoding/decoding performance in software. VMX began as the "vMix Video Codec" used for the vMix Instant Replay feature. It has since been expanded with alpha channel support and incorporated into the Open Media Transport protocol.

Features

• Low latency intra-frame only
• 4:2:2:4 with alpha channel support
• 10 bit support
• Highly optimized AVX2 code capable of encoding 2160p60 on a single Intel i7 core
• Cross platform. (Windows, Mac, Linux) with ARM NEON support provided via sse2neon

License

VMX is distributed under a permissive MIT license. Further details can be found in the LICENSE file

System Requirements

x86_64

Minimum: 64bit CPU with SSE4.2 and SSSE3 Recommended: 64bit CPU with AVX2 support (Intel Haswell (2013) and newer)

ARM64

64bit ARM CPU with NEON instructions (ARMv8)

Documentation

Documentation can be found at: https://www.openmediatransport.org/docs/

Getting Started

Binaries with Library files are available in the Releases section of the libomtnet repo. These are available for Windows and MacOS and are the recommended way to get started.

C/C++

Include vmxcodec.h, reference libvmx.lib and you're ready to go.

C#/VB.Net

All functions can be called with DllImport

Use IntPtr for the instance type. No structs need to be defined.

Compiling

Windows

1. Install Visual Studio 2022 and Intel C++ Compiler 2024 or higher
2. Open libvmx.sln
3. Build

Linux

1. Install Clang
2. cd ./build
3. Run ./buildlinuxx64.sh or ./buildlinuxarm64.sh depending on platform

Mac (ARM64)

1. Install xcode with Apple Clang Compiler
2. cd ./build
3. Run ./buildmacuniversal.sh