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战斗力 鹅
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注册时间 2011-4-3
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引用第23楼天神十三煞于2011-04-13 23:00发表的 :
PSP的480p是main 3,不然看不了的吧,有高的选高的,没事用ASP干啥
这里说PSP视频和一般TV番压制就说480p,管480x272或以下的什么事
main 3对付tv的480p基本上是够用的,真要轮是ASP的问题话
还不如去黑水果,都是baseline,所谓的质量的毒瘤?
....... 
1。再次强调,我说的是整个MP4,自然要包括ASP。不要因为现在AVC用在BD上了,就把MP4看成高端编码了。MP4最初的出发点是面向流媒体的。(因为MP2压缩率低,不适合流媒体)
2。264的HP是04年还是05年,具体记不清了,追加策划的。而BD问世大约是在06年,那个时候规格内虽然包含AVC,但因为HP并没有实装(没有对应的encoder),MP不适合HD片源,所以最初只能用MP2。后来松下开发了对应HP的encoder之后,FOX宣布开始采用,才开始一点点向AVC转向。
引用第25楼天神十三煞于2011-04-13 23:22发表的 :
早期BD的264不多主要原因是商业编码器不成熟,和profile没啥关系
说参考这事就疼了,尤其是数据编码计算规范这种东西更疼
不过rv10是封闭的,mpeg 2/4 part都是放开的...
谁参考谁? 
encoder不成熟,上面我说了,就是因为没有对应HP的encoder。MainProfile和MP2比,完全不是对手,因为MP4最初是面向流媒体等的(再次强调)。
至于参考的事,引用一段话,2003年doom9里的。
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Yes, RV9 has an adaptive advanced in-loop filter, specifically designed to remove block edges before using the reconstructed frame in the prediction loop. Therefore the encoder and decoder filters have to match 100%, and the filtering strength can not be adjusted on the decoder side. It is not the same filter as in H.264, but the principle is the same in both, if you are looking for technical background on the subject. Specifically, one feature RealNetworks proposed to be included in H.264, was a tiny amount of pre-determined dither across filtered block boundaries, because on large (LCD, plasma, DLP) screens, a difference of just '1' in luminance or chrominance level is visible. However, we did not succeed, and the H.264 in-loop filter does not have this feature.
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原文连接
http://forum.doom9.org/showthrea ... ring+rv9#post366301 |
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