10bit 下 rc-lookahead 50 VS 250 实测 250暗区完胜.

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.

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……

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