The quarter-size Cb (U) plane; its stride is ChromaWidth.
The quarter-size Cr (V) plane; its stride is ChromaWidth.
Chroma plane width: half the frame width, rounded up.
Frame height in pixels.
The full-size luma (Y) plane; its stride is Width.
Frame width in pixels.
An I420 frame's three planes, as views over one contiguous buffer.