Chennai is a lossless variation of the cairo codec. It retains most of the same features of cairo, including its motion prediction and differential coding stages, but skips the lossy quantization and chroma subsampling phases.

For more information about cairo, check out its project page.



Experimental Video Codecs

EVX is a collection of five evolutionary video codecs that focus on targeted solutions for specific use cases. The following diagram illustrates the high level progression of each codec in the family.



  Release Version Codename Target Features
  TBD EVX-5 Capri Massive media library compression Artificial intelligence, targeted compression
  2016 EVX-4 Cannes Mixed reality immersive content Virtual & augmented reality, 3D video format support
  2014 EVX-3 Chicago Ultra HD content Advanced transforms, large macroblock support
  2011 EVX-2 Chennai Medical and archival content Lossless compression, full rate YCbCr 4:4:4 mode
  2011 EVX-1 Cairo Low latency video streaming Experimental pipeline, video analysis & debugging tool


Source code

The source code to chennai is not yet available. In the meantime you can check out the source code for cairo, which serves as the basic framework for chennai.



More Information

For more information about chennai, please feel free to drop me a line. I plan on eventually posting the full source code, but other priorities are blocking this work for the moment. In the meantime, check out my blog for articles related to this codec and video compression in general.