问题：
What is MPEG video compression?
答案：
a) The process of electronically processing a digital video picture to make it use less storage or to allow more video to be sent down a transmission channel.
b) The process of removing picture data to decrease the size of a video image.
c) The reduction in the volume of data from any given process so that more data can be stored in a smaller space. There are a variety of compression schemes that can be applied to data of which MPEG-1 and MPEG-2 are called lossy since the data produced by compression is not totally recoverable. There are other compression schemes that are totally recoverable, but the degree of compression is much more limited.
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