超シンプル&遅いポストプロセスフィルタ。
<quality>
品質を0から8で指定。(デフォルトは3)
<qp>
量子力学パラメータ(デフォルトは0 動画によりQPを使う)。
Ultra simple & slow postprocessing filter that compresses and decompresses the image at several (or - in the case of quality level 8 - all) shifts and averages the results. The way this differs from the behavior of spp is that uspp actually encodes & decodes each case with libavcodec MPEG-4, whereas spp uses a simplified intra only 8x8 DCT similar to MJPEG.
<quality>
0-8 (default: 3)
<qp>
Force quantization parameter (default: 0, use QP from video).