I was originally told that this was a duplicate of Y41P however it seems that this is not the case after all. Y411 is a packed YUV 4:1:1 format with a 6 pixel macroblock structure containing 4 pixels. Component packing order is:
U2 Y0 Y1 V2 Y2 Y3
I have not been able to find 100% confirmation of the position for the U and V samples. I suspect that the chroma samples are probably both taken at the position of Y2 but this is a guess just now.
I have recently been informed that this format is identical to IYU1.
| Horizontal | Vertical | |
| Y Sample Period | 1 | 1 |
| V Sample Period | 4 | 1 |
| U Sample Period | 4 | 1 |
Effective bits per pixel : 12
Positive biHeight implies top-down image (top line first)
Child formats: IYU1