RTMP(Real-Time Messaging Protocol) was the real standard for video transport in the early days of streaming on the internet. RTMP is a TCP based protocol that was designed to maintain the continuous low inactivity connection and smooth streaming experiences.
This protocol started behind the live and on-demand streaming with the adobe flash player as the secret sauce. This is because flesh plugin powered 98 percent of internet browsers that’s why RTMP used everywhere.
Today Most Of the encoders can telecast RTMP and several media servers can accept it. Even most of the big social media players such as Facebook YouTube and Periscope accept it. However RTMP streams have a compatibility problem when it comes into playback on popular browsers and devices.
In this article we will discuss something more than this about RTMP so let’s begin from what is RTMP?
What Is RTMP?
RTMP is one streaming protocol that was designed to the broadcasting audio-video and other data between the assigned streaming server and adobe flash player. Before RTMP was a proprietary but now it is an open specification.
According to Adobe Adobe’s Real-Time messaging protocol gives two-way messages multiplex services over a secure stream transport. Such as TCP [RFC0793] intention is to carry equal streams of audio-video and data messages associated with the timing information between the pair of communication peers.
How Does RTMP Work?
RTMP also defines various virtual channels that work separately of each other for packets to be distributed on. Means of it that the audio and video has distributed on different channel concurrently.
RTMP (Real-Time Messaging Protocol) works as a three steps procedure at a high level That is given below.
Step 1 : Handshake
Formerly when the RTMP builds the TCP connection then it makes a handshake by interchanging three packets between clients and servers. These packets are known as chunks.
The whole process are seems like this.
- The client sends chunks to the server to inform that of what protocol version it is using.
- Without waiting for any response the client sends another chunk this time with the timestamp.
- Then the server responds with the chunks that it has received from the client with a timestamp.
- After that client sends one more final packet which is the copy of the timestamp packet and the server returns it.
- When the final packet has been interchanged completely then the handshake will be considered complete.
Step 2 : Connection
- Here now a client and server can create a connection through an AMF(Action Messages Format) messages.
- And the server will accept a request and give the response with the relevant message sequence.
Step 3 : Stream
- Here now the client can begin the audio and video stream by sending the three messages to the server that is the createStream, ping, and play.
Example Of RTMP ( Real Time Messaging Protocol)
You can make your own real-time messaging protocol live stream like a simple RTMP server (SRS) on your own server or a provider such as ManyCam by using software.
The official method of setting an RTMP live stream needs at least one server for your streaming software and a connection to a different content delivery network.
The primary issue of this standard setup is the possibility of the enhanced latency because the streams travel from your server to your CDN(Content Delivery Network) before being distributed to your viewers.
Use Of RTMP(Real Time Messaging Protocol)
- RTMP is used to do live streaming.
- RTMP can do ABS( Adaptive Bitrate Streaming) ABS is a technique that is used in streaming multimedia over the internet. where the quality of the video adjust automatically to changes in bandwidth.
- In RTMP players can find the next part in a video that is useful for files that is more than 10 minutes.
- Players keep tiny buffer instead of downloading the video Throughout the playback and save bandwidth.
The biggest use of RTMP is to do live streaming with the support of an encoder like a flash media encoder.
Contributed By :- Suhasini Mishra