Video XL
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This is 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 start of each line 5-bit quantised value of component is stored instead of delta.