在XviD中，Configuration里面各项参数的设置，将会对成品产生细微的影响，各个参数的具体含义请参看DGWXX的《XviD1.0参数详解》；本文将结合实际的压片成果对其中各项参数得到的影象画面进行讨论：
片源：第六届中韩歌会片断（HDTV） 1024 x 576
为了得到一个相对公平的测试结果，现在决定按照相同的设置进行同一片源的压制，唯一不同的设置将在下面详细说明：
相同设置部分
压制工具：Gordian Knot 0.33.1
压缩编码：XviD 1.03
量化方式：hvs-best
搜寻宽度：VHQ4：wide search
Quantization设置：1，2，1，5，1，31
分辨率：740 x 416
目标体积：139Mb
AVS 滤镜：降糙关闭
不同设置部分
下面我们将分别开启 Quarter Pixel（以下简称QP） 、Global Motion Compensation（以下简称GMC）、仅仅使用B-VOPs和关闭B-VOPs 四个不同参数进行测试；得到的结果如下：
1、开启QP
成品的DRF评测如下：
FourCC: XVID
Codec: XviD0037
Resolution: [ Width: 740 Height: 416 ]
Frame Rate: 23.976 frames per second
The Video has 8472 frames [ 00:05:53 ]
Average Frame quality is HIGH [Average DRF/quantizer is 2.38]
Standard Deviation: Quality is HIGH [Std. Deviation is 0.54]
Image Resolution is HIGH
The file has Packeted Frames!
There are NO frame drops ( NO drops is better )
Recomended Resolution: [800x448] (Target DRF/quantizer=2.8)
The filesize can be smaller!
Performance Caracteristics:
This video seems to have too FEW Keyframes. May degrade image quality and seeking.
Macroblocks per frame: 1196 ( Poor Playback in Slow Computers, PIII450 or better required )
The Width is not multiple of 32. May degrade performance in some systems.
Kilobits per Second: 2971.32
Kilobits per Frame: 123.80
Kilobits per Macroblock: 0.104
Bits per Pixel: 0.41
Frame Type Statistics :
I Frames: 0.42%
P Frames: 63.07%
B Frames: 36.51%
S Frames: 0.00%
N Frames: 0.00%
(More Advanced Codecs use B and S frames)
Frame Quality Statistics :
DRF=1&2: 5122 60.7%
DRF=3: 3246 38.5%
DRF=4: 68 0.8%
DRF=5: 0 0.0%
DRF=6: 0 0.0%
DRF=7: 0 0.0%
DRF=8: 0 0.0%
DRF=9: 0 0.0%
DRF>9: 0 0.0%
KeyF/DeltaF: 0.43%
KeyDRF<4: 31
KeyDRF=4: 0
KeyDRF>4: 5
AverageKeyDRF: 1.86
MAXDRF: 4
AverageDRF: 2.38
Deviation: 0.54
Codec: XviD0037
Resolution: [ Width: 740 Height: 416 ]
Frame Rate: 23.976 frames per second
The Video has 8472 frames [ 00:05:53 ]
Average Frame quality is HIGH [Average DRF/quantizer is 2.38]
Standard Deviation: Quality is HIGH [Std. Deviation is 0.54]
Image Resolution is HIGH
The file has Packeted Frames!
There are NO frame drops ( NO drops is better )
Recomended Resolution: [800x448] (Target DRF/quantizer=2.8)
The filesize can be smaller!
Performance Caracteristics:
This video seems to have too FEW Keyframes. May degrade image quality and seeking.
Macroblocks per frame: 1196 ( Poor Playback in Slow Computers, PIII450 or better required )
The Width is not multiple of 32. May degrade performance in some systems.
Kilobits per Second: 2971.32
Kilobits per Frame: 123.80
Kilobits per Macroblock: 0.104
Bits per Pixel: 0.41
Frame Type Statistics :
I Frames: 0.42%
P Frames: 63.07%
B Frames: 36.51%
S Frames: 0.00%
N Frames: 0.00%
(More Advanced Codecs use B and S frames)
Frame Quality Statistics :
DRF=1&2: 5122 60.7%
DRF=3: 3246 38.5%
DRF=4: 68 0.8%
DRF=5: 0 0.0%
DRF=6: 0 0.0%
DRF=7: 0 0.0%
DRF=8: 0 0.0%
DRF=9: 0 0.0%
DRF>9: 0 0.0%
KeyF/DeltaF: 0.43%
KeyDRF<4: 31
KeyDRF=4: 0
KeyDRF>4: 5
AverageKeyDRF: 1.86
MAXDRF: 4
AverageDRF: 2.38
Deviation: 0.54
影片的第3932帧截图如下：
