SummaryISO/IEC 14496-12 specifies the ISO base media file format, which is widely used for the interchange of multimedia content, including image-based media. Many derivatives of the ISO base media file format have been developed, including ISO/IEC 23008-12, which are specifically designed for individual images, image collections and image sequences. While the JPEG 2000 family (Rec. ITU-T T.8xx series | ISO/IEC 15444) specifies several file formats (JP2, JPX and JPH) that use the same box structure as ISO/IEC 14496-12, these file formats are not compatible with ISO/IEC 14496-12 and its derivatives. To simplify interchange, this Recommendation | International Standard specifies the encapsulation of individual images, image collections, image sequences and video tracks encoded using JPEG 2000 (Rec. ITU-T T.8xx series | ISO/IEC 15444) into the ISO base media file format and its derivatives. It improves over Rec. ITU-T T.802 (01/05) | ISO/IEC 15444-3:2007, which, at the time of this writing, has several limitations, including: it is limited to video tracks; it does not support signalling of capabilities and profiles using the Rsiz, CAP and PRF marker segments specified in Rec. ITU-T T.800 | ISO/IEC 15444-1; it is based on ISO/IEC 15444-12, which is a withdrawn derivative of ISO/IEC 14496-12; and it does not include advanced features introduced in the JPX file format. An image encoded according to the JPEG 2000 family of image formats is called a JPEG 2000 codestream and its structure is specified in Rec. ITU-T T.800 | ISO/IEC 15444-1. The processing of JPEG 2000 codestream can require capabilities defined beyond those in Rec. ITU-T T.800 | ISO/IEC 15444-1. The capabilities required to process a JPEG 2000 codestream including the presence of HT code blocks that conform to Rec. ITU-T T.814 | ISO/IEC 15444-15 or extensions defined in Rec. ITU-T T.801 | ISO/IEC 15444-2 are signalled in the Rsiz field and CAP marker segment within the JPEG 2000 codestream. To avoid inconsistencies, the information contained in the Rsiz field and CAP marker segment is not duplicated at the ISO base media file format level either as metadata or through file brands. This Recommendation | International Standard does not specify requirements on the capabilities required to process a JPEG 2000 codestream, e.g., profiles and levels, and the definition of such requirements is left to individual applications. Recommendation ITU-T T.815 (2025) is a common text with ISO/IEC 15444-16:2025. This third edition cancels and replaces the second edition, which has been technically revised. The main changes compared to the previous edition are as follows: adds more flexible signalling of colour information; explicitly specifies the encapsulation of JPEG 2000 images into ISO/IEC 14496-12; defines the structures necessary to implement JPEG 2000 video tracks. |