Lagarith

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:

Speed

While not as fast as HuffYUV, it still outperforms most other lossless video codecs when it comes to encoding times,^[5][6] although decoding speed may be slower. Recent versions also support parallelizing on multi-processor systems.

Color-space support

Color-space conversions can cause rounding errors, introducing data loss, contrary to the ideal of lossless video compression. Lagarith attempts to avoid this problem by supporting YV12, YUY2, RGB, and RGBA colorspaces.

Keyframes

Disallowing inter-prediction means that each frame can be separately decoded. This makes cutting, joining and seeking much easier.

Lagarith
Lagarith 1327 configuration dialog running on Windows 10.
Developer(s)	Ben Greenwood
Initial release	October 4, 2004; 20 years ago (2004-10-04)
Stable release	1.3.27[1] / 8 December 2011; 13 years ago (8 December 2011)
Written in	C++, ASM
Operating system	Windows 2000 and later
Predecessor	Huffyuv
Type	lossless video codec
License	GNU GPLv3
Website	lags.leetcode.net/codec.html

These three things, as well as being more efficient at compression than HuffYUV, make it editing stage.