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. The metadata accompanying the RAW data are preserved, and sidecar files, like MD5, LUT or XML, can be added into the Matroska container as attachments. This allows to manage these audio-visual file format in an effective and transparent way (e.g. native playback by VLC), while saving typically between one and two thirds of the needed storage, and speeding up the back-up on LTO cartridges. When needed, the source is retrieved bit-by-bit.