Unicasting based systems can offer the user full control over the media stream, thus are much preferable by the user. But since each stream is exclusive occupied by a single user, the cost per user is very high.
单播VOD系统能提供独立的用户交互功能，但是每个用户独占一个节目流资源，比组播共享方式的成本高。
参考来源 - 社区宽带网络中VOD软件实现·2,447,543篇论文数据，部分数据来源于NoteExpress
Use unicasting, direct broadcast, or multicasting.
使用单点传送、定向传送或多点传送。
So, there are two broad approaches to get video to you-unicasting and multicasting.
那么，现在有两种获取视频的主流方式——单播和多播。
Unicasting is what I mostly described above, and what you're probably most familiar with, actually.
单播是指我在上文提到的，实际上也可能是你最熟悉的方式。
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