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I am afraid XviD encoding parameters (if anyone cares) are not well selected.
In my own SSIM tests of SD size, XviD 1.3(.1)'s "-qpel" is always counter-productive under "-qtype 0 -vhqmode 4". Only when under "-vhqmode 1" and within a certain "mid" bitrate range (40 to 70 under Teegdeck's comp-test), "-qpel" produces a slightly higher SSIM (but probably not high enough to justify the speed impact). Further, under a low bitrate situation (15 to 35), we should use the "EQM v3 LR" custom matrix (without -qpel).
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