This Recommendation | International Standard has been jointly developed by ITU-T Video Coding Experts Group (VCEG) and the ISO/IEC Moving Picture Experts Group. It is published as technically-aligned twin text in both
organizations ITU-T and ISO/IEC.
ITU-T H.264.1-2005 history
2005ITU-T H.264.1-2005 Conformance specification for H.264 advanced video coding Study Group 16