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This happens because of the limited bandwidth (here specifying the amount of data used to transmit the picture) and the compression methods used.
most codecs use previous frames to provide information for the next. The data specifies, roughly speaking, how the current frame should be changed to make the next frame. When most of the frame is still, the data is used to refine the picture, adding detail and removing artifacts, which are errors in the picture created by the compression.
Most codecs handle pans (where the camera is changing angle) poorly. The constant movements cause lossage, and most of the data budget is spent describing new content appearing at the side. So you get a loss of picture quality.
This is a problem with satelite TV because the amount of data that the provider has to split up between it's channels is limited. So picture quality suffers badly.
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