『漫游』酷论坛>『影音数码技术学习交流』>10bit 下 rc-lookahead 50 VS ..
10bit 下 rc-lookahead 50 VS 250 实测 250暗区完胜.
differ_cn@2012-01-16 14:11
虽然有人说rc-lookahead 的值如果用250. 偏暗场景质量差、会产生banding
我实际压了一次.结果在这里.
http://115.com/file/besng2dz#
2PASS 除了一个参数以外,其他都一样.(rc-lookahead)
动态下看不出啥区别.
1分33秒(所谓暗区) 静止状态下对比,显然rc-lookahead 250 色块更少,过渡更平滑.
源我就没上传了,440M,太大了.(18500 KBPS),总之质量很好,不会是源的问题.
另外,我是用10BIT压的.没测8BIT的情况.
至少10BIT压片,rc-lookahead 250 画质更好.(虽然压片的时候内存占用上升非常多.)
differ_cn@2012-01-16 16:05
我又仔细比较了两个视频.
现在已经完全看不出谁画质更好了.(有区别,但看不出谁画质更好)
SSIM的确是 rc-lookahead 250 更高.
哪位高人帮忙看看,那个画质更好.
[ 此帖被differ_cn在2012-01-16 16:25重新编辑 ]
shinjico@2012-02-13 09:16
32位系统表示用了250内存崩了 
foreverbelmont@2012-02-14 19:19
一般最多也就开到80，开250很多时候观感没什么明显提升。
06_taro@2012-02-14 19:24
引用
Originally Posted by IRC
00:13 < Dark_Shikari> we need vfr mbtree first, for anime
00:13 < Dark_Shikari> or at least time-limited mbtree
00:13 < Dark_Shikari> in the meantime just stop using rc-lookahead 250
00:20 < Mandarinka> "[23:13] <Dark_Shikari> in the meantime just stop using rc-lookahead 250" --- wait, it actually hurts? As in, the bias effect gets too strong?
00:21 < Dark_Shikari> yes, on completely static scenes, probably so
00:21 < Dark_Shikari> my plan is to implement an internal cap to how long an object can "stick around" as seen by x264
懒得多说……
| TOP