What is RTMP and How Does it Work?

RTMP is a protocol that is used for streaming video and audio. It is similar to RTSP but has a few differences. The primary difference is that RTMP is faster and can be used in any application that supports RTSP.

Stream Key

RTMP stands for Real Time Messaging Protocol, a communication protocol that allows for video, audio, and data transmission over the Internet. It was initially developed by Adobe and was later released as open source. It uses a three-way handshake to transmit data between a dedicated streaming server and Adobe Flash Player.

The RTMP live stream is a video contribution that can be sent to any destination supporting RTMP. A live stream can be sent from a producer device or hardware encoder to a broadcast studio, to a 3rd party website, or a video-sharing platform.

RTMP is used with many media types and has become a standard in the streaming world. It uses a three-way handshake, meaning that each party must be acknowledged before the other can send data packets. This is important to remember when broadcasting with RTMP because it represents a delay of about five seconds.

The stream key is a secret code, usually a long alphanumeric string. The service can provide the RTMP stream key, or the encoder can generate it. The RTMP stream key will change each time you broadcast, so it is essential to keep it private.

Message Stream ID

RTMP messages are used for many audio-video applications. They are sent over a network between a client and a server or between two servers. They have two parts: a header and a payload. The title holds meta-data information, while the cargo holds actual data.

An RTMP message has a four-byte timestamp. This timestamp is used to determine when data should be presented. It is also used to determine whether a packet is audio or video.

The Chunk Message Header contains information about the packet type, message length, and time scale. It also includes a message stream ID, which identifies the message stream. This is usually a three-byte field. The first two bits (the least significant bits) represent the chunk stream ID, while the rest of the header holds the rest of the packet. This format can be 1-byte or 2-bytes. It is also possible to add additional bytes used for padding.

Message Length

RTMP is an application-level protocol for multiplexing multimedia transport streams over TCP. It is used in a variety of audio and video applications. There are several advantages to using RTMP. However, there are some disadvantages as well.

RTMP uses a three-way handshake to connect the client and the server. This handshake includes a COMMAND_AMF0, which specifies that the connection is initiated. It also contains the sequence number and the number of bytes received. It must be sent by the initiator and acknowledged by the accepter.

The RTMP specification also includes optional messages. These messages propagate information that the RTMP streaming layer will use. These messages are named User Control messages. They are effective at the time of receipt. RTMP uses a message type ID of 4 to transmit User Control messages.

For streams of the same message, it is best to use Type 3 chunks. This means that the payload of each piece will be the same as the chunks before it. This means that you don’t have to register deltas between chips.

Timestamp Delta

RTMP Chunk Stream is a protocol that provides guaranteed end-to-end delivery of messages. In RTMP Chunk Stream, a ‘chunk’ is a letter fragment. The header of the chunk contains information about the message being sent.

There are two parts to an RTMP message: the header and the payload. The title contains the timestamp, and the shipment contains the actual data. There are many different types of messages. The message format is outside the scope of this document, but it should have the necessary fields for generating chunks.

The RTMP Chunk Stream layer provides a way to retransmit messages and a mechanism to embed user-control notes into the stream. The random echo field, for instance, can be used to estimate bandwidth and latency.

The RTMP Chunk Chunk Stream layer uses protocol messages with IDs 1, 2, 3, 5, and 6. In some RTMP implementations, the versions are known as INVOKE, AMF0, and AMF3.

The AMF0 version is AMF0-encoded. The AMF3 version is AMF3-encoded. In addition, the RTMP Chunk Stream protocol provides an ‘on user data event’ command that allows custom metadata feeds.


RTMP and RTSP are two different protocols that can stream audio and video data on the Internet. They are both parts of a more extensive system of protocols used to create streaming experiences. Both are based on the TCP protocol, providing different features and benefits.

RTSP is a low-latency streaming protocol that uses TCP and UDP to deliver video signals. It is often used with IP cameras to broadcast live videos to viewers. However, it is only sometimes compatible with all devices and browsers.

RTMP is an application-level protocol developed by Adobe. It was initially designed for use with the Flash player and Media Server. It was later released as an open standard to make it easier to use for a larger audience.

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