Dalí is a high performance library of routines for manipulating video, audio, and image data.
"A software library for high-performance multimedia processing that provides lower level abstractions than most libraries, but much higher level than C. Dalí is designed for high-performance, and is based on several design principles such as explicit resource management, resource sharing and thin operations."
Dali has both C and TCL implementation.
Last updates appear to be in 1999.
AF discovered this while searching for mpeg info