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相约北美 / 移民留学 / 懂 MPEG 1-2-4 标准的同学请举手~~~~~ 有问题要问！！！
-scorpio(scorpio);
2001-8-15
(#167067@0)
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真就没有人懂？那个谁谁，向我要TORONTO JOB的同学，出来呀。帮我解释解释，MPEG4为什么就比MPEG2文件还小质量还高？没道理呀！
-scorpio(scorpio);
2001-8-15
(#167195@0)
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MPEG4是变码率，MPEG2是固定的。
-ggsddu(ggsddu);
2001-8-15
(#167204@0)
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只有MPEG1是1.5M固定码率的。MPEG2是12M可变码率。
-scorpio(scorpio);
2001-8-15
(#167628@0)
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这主要是来自于设计的不同目标，mpeg2设计要求是在Mbit/s的码流下进行传输，而mpeg4追求的是低码流(4800-64000)下的数据传输。由于算法的改进(引入AVObject等)，虽然是有损压缩，但还原能力很高。BTW，和可变码率无关
-flipflop(翻云覆雨);
2001-8-15
(#167311@0)
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So many high-hands!
-eglington(eglington);
2001-8-15
(#167327@0)
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这就是我不明白的地方。极低码率的压缩居然能不高码率压缩的质量还好？他就比2多了OBJECT，BIF，运动估计的时候多了个GLOBAL MOTION ESTIMATION，其他没多什么。DIVX比DVD的文件小，质量好吗？
-scorpio(scorpio);
2001-8-15
(#167641@0)
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问题是如何建立AVOobject?
-guest:;
2001-8-15
(#167665@0)
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边缘监测，链码
-scorpio(scorpio);
2001-8-15
(#167688@0)
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恐怕只适合动画片
-guest:;
2001-8-15
(#167723@0)
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let me see what is in the standard. I will tell u guys later.
-scorpio(scorpio);
2001-8-15
(#167759@0)
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Mpeg4 没有Mpeg2质量高
-eglington(eglington);
2001-8-15
(#167330@0)
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你确定？DIVX没DVD图像质量高？
-scorpio(scorpio);
2001-8-15
(#167649@0)
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和DVD 比差太远了.
-guest:;
2001-8-15
(#167670@0)
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OK，那我就明白了，谢谢！
-scorpio(scorpio);
2001-8-15
(#167686@0)
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divx差强人意吧，至少容易从网上download吧，效果吗比vcd强多了。
-starshower(星雨);
2001-8-15
(#167810@0)
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agree
-xiaoduo(xiaoduo);
2001-8-15
(#167674@0)
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谁问谁呀？
-mike2000(风筝);
2001-8-15
(#167360@0)
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我问问题呀。并且还想作个调查，ROLIA上有多少是作VIDEO/AUDIO COMPRESSION这个东西的，交流交流嘛。
-scorpio(scorpio);
2001-8-15
(#167646@0)
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不是老师问同学，就是同学问老师。
-doggie(爱吃骨头的狗);
2001-8-15
(#167381@0)
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DVD used intra encoding method only, highest quality, lower compression ratio. MPEG2 used IBP encoding, higher compression ratio and complexity. MPEG4 is used for very low bit rate coding.But i donot know why so many MPEG4 is used for movie.
-hhll26(likeplay);
2001-8-15
{53}
(#167790@0)
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DVD = MPEG2 ... keke
-scorpio(scorpio);
2001-8-15
(#167816@0)
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For my knowledge, they are not of same standard, there is no motion estimation in DVD.
-hhll26(likeplay);
2001-8-15
(#167823@0)
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www.mpeg.org
-scorpio(scorpio);
2001-8-15
(#167836@0)
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ok.guys,a very big company in Toronto needs a mpeg codec developer now, 70k at least. anybody know how to write it, go! I really want to go, but I dont want to leave vancouver...such a pity...
-scorpio(scorpio);
2001-8-15
(#167825@0)