这需要传输大量的声音和视频，占用大量的带宽，如视频点播、网络会议等。
It requires a mass of transmission of audio and video which take high bandwidth, such as video on demand, network meetings.
测试结果表明，本系统达到了MPEG - 4网络点播与组播的基本要求，能实时传输图像和声音，并在一定范围内达到音视频同步。
The test result shows that the system can transport MPEG-4 video and audio Unicast or Multicast and playback the video and audio sync.
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