Hardware Knowledge: Introduction to RTMP and RTSP Traditional Streaming Protocols

Today I will share with you the introduction of RTMP and RTSP traditional streaming media protocols, I hope it can be helpful to you!

1, RTSP

1.1 RTSP protocol introduction

RTSP (Real-Time Stream Protocol) is a text-based multimedia playback control protocol jointly proposed by Real Networks and Netscape.RTSP defines the stream format, and the stream data is transmitted through RTP; RTSP real-time effect is very good, suitable for video chat, video surveillance and other directions.

1.2 Features

• RTSP supports reliable segmented streaming and supports viewing while downloading.

• RTSP relies on dedicated servers and relies on the RTP protocol (based on the UDP protocol), so this protocol does not support encrypting video content or retransmitting lost packets.

1.3, RTSP Workflow

• The user equipment sends an RTSP request to the video streaming platform

• The video streaming platform returns a list of requests that the user can operate, such as play, pause

• The user sends a specific request to the video streaming platform to the device according to the list of requests it has, for example: play video

• The video streaming platform parses the request and invokes the specified mechanism to start the video stream processing

1.4 Applicable Scenarios

Android and iOS devices do not have RTSP compatible players out of the box, so they are not used much on mobile devices, RTSP is very widely used in many surveillance and closed circuit television (CCTV) applications, such as remote cameras, online video and Internet live broadcastIt is very suitable for other fields.

2. RTMP

2.1 Introduction to RTMP

RTMP (Real Time Message Protocol) was proposed by Adobe to solve the multiplexing (Multiplexing) and packetizing (packetizing) problems of multimedia data transmission streams. The advantages are low latency, high stability, and support for allThe camera format can be played directly by loading the flash plug-in in the browser.TCP port 1935 is used by default.

2.2 Workflow

• Camera capture video

• Stream the video to the video platform server via the encoder

• The video platform handles the video stream

• Distribute via CDN to the server closest to the user

• The final video stream can successfully reach the user device

2.3 Features

• It can maintain a stable connection between the server and the client server, and it can stream media with seamless low latency regardless of the quality of the user's internet connection

• Not compatible with HTML5 players

• Vulnerable to bandwidth issues

2.4 Applicable Scenarios

RTMP is mainly used for Internet audio and video transmission. It uses TCP transmission. Because the Internet environment is relatively poor, RTMP can ensure the transmission quality of video, but its transmission delay is relatively high and transmission efficiency is relatively low.

3. The difference between RTSP and RTMP protocols

3.1 Similarities

• RTSP and RTMP protocols are in the application layer

• Theoretically both RTSP and RTMP can do live broadcast and VOD

3.2 Differences

RTSP protocol has the best real-time performance, but the implementation is complex, suitable for video chat and video surveillance;

The advantage of the RTMP protocol is that it has good browser support and can be played directly after loading the flash plug-in.