最近视频的东西比较火，前些天我也稍微了解了一下使用开源软件建在线Flash流媒体播放平台的解决方案，还是有一些收获。
Red5是一款基于java的开源的Flash流媒体Server软件，可以作为取代Macromedia提供的商业版本FMS。Red5使用RSTP作为流媒体传输协议，内置了一些示例，这些示例实现了在线录制，flash流媒体播放，在线聊天，视频会议等一些基本的功能。由于系统本身是开源的，在碰到问题的时候也比较容易解决，大不了直接改代码，在成本方面也可以省下一笔不小的开销，为未来的功能扩展也提供了充分的空间。
如果仅仅是实现在线录制，在线播放，那么Red5也就差不多够了，但可能我们有时候还需要用户上传自己拍摄的视频文件，而要把这些视频文件转成可播放的flv文件就需要视频编码软件了。FFMpeg提供了录制，播放，视频流处理的完整解决方案。它自身也带了一个基于HTTP的流媒体广播程序以及其它几个实用的程序，但我们的重点还是它的视频转换程序，似乎Google Video也是用的它的程序作为视频转换工具。
我用FFMpeg转了几个视频，效果还可以，在声音上碰到了一些问题，在不添加参数的情况下，有一部分视频的声音会有问题，有的视频无论怎么添加参数，都出不来声音，报错提示的是不支持所带的声音采样格式，只支持几种固定的格式，我看了一下代码，确实是这样子，但理论上应该是能够解决的。FFMpeg自带的libavcodec是一套很牛的编码库，为了保证质量和性能，里面的很多codec都是从头开发的。
这两个加起来，实现一些简单的在线视频功能就差不多了。
PS:今天刚看到古永锵也开始做小视频分享网站：优酷。
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