1. A method for pre filtering processing an original video sequence, the original video sequence comprising a plurality of video frames, the method comprising: for each video frame of the plurality of video frames of the original video sequence: identifying a bounding geometric shape that encloses at least a portion of an important region-of-interest in the video frame, the bounding geometric shape serving as a foreground region; identifying a portion of the video frame outside the bounding geometric shape as an unimportant background region; applying a first filter operation in the foreground region and not in the background region, the first filter operation providing data reduction in the foreground region; and applying a second filter operation in the background region and not in the foreground region, the second filter operation providing greater data reduction in the unimportant background region than the first filter operation would provide if applied to a same region; and encoding the plurality of video frames after the first and second filter operations have been applied to each of the plurality of video frames.