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IYU2 yuv pixel format

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The IYU2 format is a 24 bit format used in mode 0 of the IEEE 1394 Digital Camera 1.04 spec (ibid.) The format is YUV (4:4:4) according to the following pattern:

Byte 0 1 2 3 4 5
Sample U(K+0) Y(K+0) V(K+0) U(K+1) Y(K+1) V(K+1)

  Horizontal Vertical
Y Sample Period 1 1
V Sample Period 1 1
U Sample Period 1 1
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