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This document specifies container file formats for JPEG AI codestreams as specified in Rec. ITU-T T.840.1 | ISO/IEC 6048-1 and Rec. ITU-T T.840.2 | ISO/IEC 6048-2. It defines file formats for working with image and motion sequence files on computer platforms, allowing Internet-based and other communications.This document uses already existing specifications for file formats and extends them for the embedding of JPEG AI codestreams.