The server also requires port 554 (RTSP, real-time streaming protocol) for QuickTime stream setup and control.

服务器还需要端口554 (RTSP，实时流协议)用于quicktime流设置和控制。

youdao

RTSP is a streaming media presentation control protocol used to manage the delivery of real-time data. It doesn't transfer streaming data by itself.

实时流协议rtsp是一个流媒体表示控制协议，用于控制具有实时特性的数据发送，但RTSP本身并不传输数据。

youdao

At the same time, Adobe will continue to innovate and develop its HTTP streaming protocol, HTTP Dynamic Streaming (HDS), which is used by major broadcasters worldwide.

ENGADGET: Adobe announces Project Primetime video platform, Highlights available now for iPad (update: video)