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style="font-size:12px;">M-JPEG源于JPEG压缩技术，是一种简单的帧内JPEG压缩，压缩图像质量较好，在画面变动情况下无马赛克，但是由于这种压缩本身技术限制，无法做到大比例压缩，录像时每小时约1-2GB空间，网络传输时需要2M带宽，所以无论录像或网络发送传输，都将耗费大量的硬盘容量和带宽，不适合长时间连续录像的需求，不大实用于视频图像的网络传输。</span></p><p style="text-indent:2em;text-align:left;"><span style="font-size:12px;">MPEG是压缩运动图像及其伴音的视音频编码标准，它采用了帧间压缩，仅存储连续帧之间有差别的地方，从而达到较大的压缩比。</span></p><p style="text-indent:2em;text-align:left;"><span style="font-size:12px;">H.264是 ITU-T的VCEG（视频编码专家组）和ISO/IEC的MPEG（活动图像编码专家组）的联合视频组（JVT：joint video team）开发的一个新的数字视频编码标准，它既是ITU-T的H.264，又是ISO/IEC的MPEG-4的第10 部分。</span></p><p style="text-indent:2em;text-align:left;"><span style="font-size:12px;">在技术上，H.264标准中有多个闪光之处，如统一的VLC符号编码，高精度、多模式的位移估计，基于4×4 块的整数变换、分层的编码语法等。</span></p><p style="text-indent:2em;text-align:left;"><span style="font-size:12px;">这些措施使得H.264算法具有很的高编码效率，在相同的重建图像质量下，能够比H.263节约50％左右的码率。</span></p><p style="text-indent:2em;text-align:left;"><span style="font-size:12px;">H.264的码流结构网络适应性强，增加了差错恢复能力，能够很好地适应IP和无线网络的应用。</span></p><p 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