The open, independent, and international standards organization Internet Engineering Task Force (IETF) has chartered a working group. It is named "Codec Encoding for LossLess Archiving and Realtime transmission" (CELLAR) and aims to develop specifications for a lossless audiovisual file format for use in archival environments and transmission. It consists of the combination of the audiovisual container Matroska, lossless video codec FFV1, and lossless audio codec FLAC. This paper reviews the status of this on-going development and thereby provides an overview of the challenges and intricacies of audiovisual specification development.

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