『漫游』酷论坛>『DVDRip技术研修室』>wmv9/xvid/rv9/mpeg2/divx5/div ..

skywalker@2003-07-26 10:15

那把全黑的画面去掉之后呢.......
毕竟每个全黑的地方就把差距拉大了40dB, 而眼睛看起来区别不大.....
人眼看起来, WMV和XVID区别大吗?
引用

ERICK@2003-07-26 14:36

没测,但视觉上的差距是很明显的,
引用

littleyizhi@2003-07-27 07:08

法国佬真是和Divx有缘呀,老瓶新酒 "DivX Manihi Codec Beta"
As we are getting closer to our final destination, we

discover another wonder of the French Polynesia: Manihi.

The beta version of DivX Pro Manihi offers huge quality

improvement and lots of exciting new features. Give it a test run and

provide us with your feedback.
引用

加入divxPROKauehi

ERICK@2003-07-30 00:57

测试码率:500kbps
raw mpeg2 clip: 30M
wmv9(faster)    clip:1536k
wmv9(better quality)clip:1636k
xvid          clip:1626k
divxPROKauehi clip: 1664k
divx5.05 clip: 1650k       

              Minimum Average Maximum
wmv9(better quality) PSNR: 40.9320 47.8737 106.8432
wmv9(faster)  PSNR: 39.4686 46.8549 106.8432
divxPROKauehi PSNR: 40.2288 45.8777 106.8432
xvid   PSNR: 37.8791 43.7951 60.1720
divx5.05 PSNR: 38.7073 45.7374 106.8432



Quality:wmv9>divxProKauehi>divx5.05>xvid
引用

littleyizhi@2003-07-30 07:39

一看就知道你做错了,PSNR有超过100的吗,压出来的要比本身片源还要“象”它自己? 哈哈。
测PSNR必须剔除全黑场景,在全黑场景就有很多codec的PSNR会超过100的bug,这就是差距那么大的原因。
如果真是你这个结果,XviD也不要混了。
引用

ERICK@2003-07-30 08:52

问题是出在黑暗场景上?我再做一次好了
引用

ERICK@2003-07-30 08:53

问题是出在纯黑场景上?我再做一次好了
引用

littleyizhi@2003-07-30 09:09

新出了一个测试报告,省的我做了,哈哈
http://forum.doom9.org/showthread.php?s=&threadid=57687&perpage=20&pagenumber=1
引用

littleyizhi@2003-07-30 10:15

还是自己做了一下:
XviD API3: 38.2500 43.3937 57.1403
XviD API4: 40.0345 44.9039 82.5388
WMV9: 38.8137 43.5207 82.5388
DivX Mahini:35.6903 42.9955 82.5388

还是API4强啊
引用

wmv9/keopi xvid/divx5.05pro

ERICK@2003-08-13 00:01

Minimum Average Maximum
xvid_1pass_vhq4_BF PSNR: 41.3953 46.3430 51.8527
xvid_1pass_BF_NoVHQ PSNR: 41.3286 46.2422 51.8527
xvid_2pass_BF_NoVHQ PSNR: 41.1278 46.1418 51.8527
xvid_1pass_vhq1_BF PSNR: 41.2920 45.9862 51.8527
xvid_2pass_NoBF_NoVHQ PSNR: 41.2253 45.5668 49.6583
xvid_1pass_NoBF_NoVHQ PSNR: 41.5226 45.6318 49.6583
xvid_1pass_NoBF_VHQ4 PSNR: 40.8503 43.8771 47.3326
divx5.05pro_1pass PSNR: 41.1715 45.9719 50.2667
divx5.05pro_2pass PSNR: 41.2601 46.1691 54.9770
wmv9(q90,大小1422k) PSNR: 44.7546 46.8205 51.5024
wmv9(q89,大小900k) PSNR: 42.9600 44.9849 50.1756

注1:三种通用格式比较,侧重于低码率的比较,wmv9较好,xvid做了几种参数对比,在低码率下,bf是非常有效的,xvid出现了1pass比2pass好的情况.
注2:wmv9格式中,Q89与Q90之间出现了临界点,体积的变化是跳跃性的(900k--->1422k).但PSNR下降不太多,WMV9的codec估计有猫腻......divx与rv9的合体?
引用

剑路1029@2003-08-13 07:21

无论任何vhq4/cm比no vhq4/no cm肯定高
所以没必要测试no vhq4/no cm :)
引用

补完

ERICK@2003-08-14 10:55

wmv9/keopi xvid/divx5.05pro


--------------------------------------------最低 平均 最高
xvid_1pass_vhq4_BF_CM PSNR: 44.1085 47.5027 55.0992
xvid_1pass_BF_NoVHQ_CM PSNR: 44.0500 47.4977 55.0992
xvid_1pass_vhq4_BF PSNR: 41.3953 46.3430 51.8527
xvid_1pass_BF_NoVHQ PSNR: 41.3286 46.2422 51.8527
xvid_2pass_BF_NoVHQ PSNR: 41.1278 46.1418 51.8527
xvid_1pass_vhq1_BF PSNR: 41.2920 45.9862 51.8527
xvid_2pass_NoBF_NoVHQ PSNR: 41.2253 45.5668 49.6583
xvid_1pass_NoBF_NoVHQ PSNR: 41.5226 45.6318 49.6583
xvid_1pass_NoBF_VHQ4 PSNR: 40.8503 43.8771 47.3326
divx5.05pro_1pass PSNR: 41.1715 45.9719 50.2667
divx5.05pro_2pass PSNR: 41.2601 46.1691 54.9770
wmv9(q90,大小1422k) PSNR: 44.7546 46.8205 51.5024
wmv9(q89,大小900k) PSNR: 42.9600 44.9849 50.1756
引用

«123»共3页

| TOP