use different motion vectors, there will be a discontinuity at the edge between the blocks.

Mosquito noise

Video compression artifacts include cumulative results of compression of the comprising still images, for instance ringing or other edge busyness in successive still images appear in sequence as a shimmering blur of dots around edges, called mosquito noise, as they resemble mosquitoes swarming around the object. The so-called "mosquito noise" is caused by the block-based

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