Lagarith is an open source lossless video codec written by Ben Greenwood.

[2] It is a fork of the code of HuffYUV and offers better compression at the cost of greatly reduced speed on uniprocessor systems.

[3][4] Lagarith was designed and written with a few aims in mind: These three things, as well as being more efficient at compression than HuffYUV, make it a codec useful for the video editing stage.