When video stream transmitted between different networks, Media Gateway must implement video stream format conversion, protocol process, and resource control.

在异构网络间进行视频通信时，需要通过媒体网关对视频流进行格式转换、协议处理、资源控制。

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There is also a new FaceTime camera, which can stream video in 720p resolution and display it in a new widescreen format.

同样，新系列搭载了FaceTime摄像头，可以拍摄720P录像，并且可以用宽屏格式播放。

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As is well known, pure video stream only can be played orderly, and can't be random accessed or played in network. File format is designed to solve these problems.

视频流本身只能顺序播放，不能进行随机访问和网络流化播放，文件封装则是为解决这些问题而设计的。

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