Please see my attempt to answer the following question:
Q) Calculate the STORAGE REQUIRED (in megabytes) for a 10 minute QCIF
video source assuming 4:2:0 format i.e. assume that the colour components
are sub-sampled by a factor of 2 in each of the X (horizontal) and Y (vertical)
A) Assuming the following: 176 * 144 resolution, frame rate 8.33 Hz, 8 bits/pixel we would have:
Luminance component : 176 * 144 * 8 * 8.33 = 1.7 MB
Chrominance componet : (176 / 2) * (144 / 2) * 8 * 8.33 = 0.4MB
Therefore total storage of approx 2.1MB required.