Video XL
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This is a video codec used in hardware products by Miro Video and Pinnacle.
Every line is divided into blocks of 4 pixels - 4 luma and two chroma samples. Every value is quantised to 7 bits, then delta values are computed, quantised to 5 bits and 6 deltas are stored in 4 bytes. For the start of each line a 5-bit quantised value of the component is stored instead of the delta.