vcd和svcd有何区别？？？
vcd和svcd有何区别？？？
推荐回答（4个）
VCD 包含MPEG-1 视频序列。VCD 的制作标准是Philips 和JVC 在1993年的《白皮书》中制定的。第一条轨道中包含了用于播放VCD 的CD-i播放程序，以及基于ISO 9660 文件系统的CDI、MPEGAV 和VCD目录。后面的轨道采用“CD-ROM/XA-Mode 2/Form 2 扇区”格式，并包含MPEGAV中列出的经过MPEG 编码的音频/视频序列。
CD-i 播放器、专门的VCD 播放机、带有CD-ROM/XA 支持和MPEG 解码器的PC上的CD-ROM 驱动器（标准是在Windows 98 和更高版本上），或者是您自己的VCD 软件，都可以播放VCD。
VCD 支持以下格式：
352x288，每秒25 帧(PAL)
352x288，每秒29.97 帧(NTSC)
704x576，单帧
704x480，单帧
352x288，每秒29.976 帧（“电影”分辨率）
超级VCD (SVCD) 格式是VCD 格式的增强型。
超级VCD 包含了MPEG-2 视频序列。超级VCD 是VCD技术的继承者，而且，从视觉效果来看，相比于接近VCD 而言，它更加接近于DVD。
在VCD 上，电影是用MPEG-1 格式（每秒25 帧）编码，分辨率为352 x288（PAL，每秒25 帧）或352 x 240（NTSC，每秒29.97 帧）像素。在SVCD上，数据传输速率是2.6 Mbit/秒，它是VCD 数据传输速率的两倍。SVCD 的MPEG-2 编码器使用的分辨率为480 x 576（PAL，25 Hz）或480 x480（NTSC，29.97 Hz），这样的分辨率是DVD 分辨率的三分之二。
但是，单幅图像所允许的最高分辨率是相同的：704 x 576 或704 x 480。
另外，可以使用可变的位速率，这就意味着没有什么运动的安静场景可比动作剧烈的场景压缩比率高。
一张超级VCD 能够以最高品质容纳大约35 分钟的电影（使用存储容量为74分钟的标准空白光盘）。
“中国录制标准委员会”开发了同名超级VCD (SVCD) 格式，“VCD联盟”（Philips、Sony、Matsushita 和JVC）开发了高品质VCD (HQ-VCD)格式，当今的超级VCD 格式是这二者的结合。
VCD基于MPEG1的，SVCD与DVD都基于MPEG2的，SVCD开发初期号称中国的DVD，但二者压缩率不同，码流介于VCD与DVD之间，因此SVCD的质量也介于VCD与DVD之间，SVCD可用CD-R光盘刻录。
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