CorePNG
From Just Solve the File Format Problem
CorePNG is a lossless video codec based on the PNG image format. Each frame can be encoded as-is (I-frame), or can represent a delta from the previous frame (P-frame). In both cases the data is compressed in standard PNG format.
It uses the FourCC code png1.
The codec supports RGB[A] and YUV colorspaces: In RGB mode every frame is compressed as a PNG image; in YUV mode a frame is stored as 3 PNG images with order Y, U, V.
CorePNG was originally developed for use with subtitles, but evolved into a lossless codec that claims sometimes to outdo Huffyuv and Loco in terms of compression.
