tionally fixed a number of minor errors and needs for clarification and defined three previously-reserved sample aspect ratio indicators. Amendment 1 "Support of additional colour spaces and removal of the High 4:4:4 Profile" contained alterations to Rec. ITU-T H.264 | ISO/IEC 14496-10 Advanced Video Coding to specify the support of additional colour spaces and to remove the definition of the High 4:4:4 profile. NOTE - Rec. ITU-T H.264 is a twin text with ISO/IEC 14496-10 and this amendment was published in two different documents in the ISO/IEC series: The removal of the High 4:4:4 profile was found in ISO/IEC 14496-10:2005/Cor.2. The specification for support of additional colour spaces was found in ISO/IEC 14496-10:2005/Amd.1. Amendment 2 "New profiles for professional applications" contained extensions to Rec. ITU-TH.264 ISO/IEC 14496-10 Advanced Video Coding to specify the support of five additional profiles intended primarily for professional applications (the High 10 Intra, High 4:2:2 Intra, High 4:4:4 Intra, CAVLC 4:4:4 Intra, and High 4:4:4 Predictive profiles) and two new types of supplemental enhancement information (SEI) messages (the post-filter hint SEI message and the tone mapping information SEI message). Amendment 3 "Scalable video coding" contained extensions to Rec. ITU-T H.264 | ISO/IEC 14496-10 Advanced Video Coding to specify a scalable video coding extension in three profiles (the Scalable Baseline, Scalable High, and Scalable High Intra profiles). The ITU-TH.264 edition published in 2005-11 included the text approved 2005-03 and its Corrigendum 1 approved 2005-09. ITU-T H.264 (2005) Amd.2 (2007) was available only as pre-published text since it was superseded by ITU-TH.264 Amd.3 (2007-11) before its publication; further, ITU-T H.264 Amd.3 was not published separately. This third edition integrated into the ITU-TH.264 edition published in 2005-11 all changes approved in Amendments 1 (2006-06), 2 (2007-04) and 3 (2007-11). Corrigendum 1 (2009) provides a significant number of minor correctio