RAWcooked encodes RAW audio-visual data into the Matroska container (MKV), using the video codec FFV1 for the image and audio codec FLAC for the sound.
RAWcooked is ready for production. As with any other tool, keep doing basic checks e.g. testing reversibility with your own files.
Information on this project, including builds for different platforms, can be found at https://mediaarea.net/RAWcooked.