This revision of ITU-T H.264 adds additional SEI messages for annotated regions and shutter interval information, and also includes corrections to various minor defects in the prior content of the Specification. This Recommendation was developed jointly with ISO/IEC JTC 1, Information technology, Subcommittee SC 29, Coding of audio, picture, multimedia and hypermedia information, and Rec. ITU-T H.264 is maintained as technically aligned twin text with ISO/IEC 14496-10. The technical changes in this edition were developed in a joint collaborative team with SC 29 in technical alignment with a not-yet-published edition of ISO/IEC 14496-10.