一个很好的开源视频编解码器，不像MPEG4或H.264，这个是完全免费的，我们可以学习一下。-A good open source video codecs, unlike MPEG4 or H.264, this is completely free, and we can learn about it.

Theora is a free and open video compression format from the Xiph.org Foundation. Like all our multimedia technology it can be used to distribute film and video online and on disc without the licensing and royalty fees or

x264 video encoder. A free library for the mpeg video compression. simple and easy to use.