rtmp-server

A Node.js server that receives an RTMP live stream and populates a readable object stream of the published audio, video, and data messages

Only the publish command is supported. This server is only intended for live video/audio publishing and does not provide any playback functionalities.

Install

Usage

Example-1: A simple server with a single connection, single stream

const {createSimpleServer} = require('@mediafish/rtmp-server');
const {print} = require('@mediafish/flv');
// Start an RTMP server at rtmp://localhost/live
createSimpleServer('/live')
.on('data', ({timestamp, type, data}) => {
  console.log(`RTMP message: type=${type}, timestamp=${timestamp}`);
  switch (type) {
    case 'video':
      // data is FLV video tag (AVC)
      print(data);
      break;
    case 'audio':
      // data is FLV audio tag (AAC)
      print(data);
      break;
    case 'data':
      // data is an array of JS object
      for (const item of data) {
        console.log(`${JSON.stringify(item, null, 4)}`);
      }
      break;
  }
})
.on('error', err => {
  console.error(err.stack);
});

// Or you can simply pipe the stream into a writable stream
createSimpleServer('/live')
.pipe(new Transcoder('hls'))
.pipe(new FileWriter('./dist/'));

Example-2: An advanced server with multiple connections, multiple streams

const {createServer} = require('@mediafish/rtmp-server');
// Start an RTMP server at rtmp://localhost:19350/live/{main|sub}-camera
createServer({port: 19350, maxConnectionNum: 2, maxStreamNum: 2})
.once('/live/main-camera', handleConnection)
.once('/live/sub-camera', handleConnection)
.on('error', err => {
  console.error(err.stack);
});

function handleConnection(connection) {
  console.log(`Incoming connection: path="${connection.path}"`);
  return connection
  .once('stream-1', handleStream)
  .once('stream-2', handleStream)
  .on('error', err => {
    console.error(err.stack);
  });
}

function handleStream(stream) {
  console.log(`Published stream: name="${stream.name}"`);
  return stream
  .on('data', handleMessage)
  .on('error', err => {
    console.error(err.stack);
  });
}

function handleMessage({timestamp, type, data}) {
  console.log(`RTMP message: type=${type}, timestamp=${timestamp}`);
  switch (type) {
    case 'video':
      // data is FLV video tag (AVC)
      print(data);
      break;
    case 'audio':
      // data is FLV audio tag (AAC)
      print(data);
      break;
    case 'data':
      // data is an array
      for (const item of data) {
        console.log(`${JSON.stringify(item, null, 4)}`);
      }
      break;
  }
}

API

createSimpleServer(path[, options])

Creates an RTMP server with a single connection, single stream

params

Name	Type	Required	Default	Description
path	string	Yes	N/A	A specific path that a client can connect
options	object	No	{}	An object holding option values that are used to override the internal option values

supported options

Name	Type	Default	Description
port	number	1935	The port number this server listens for

return value

An instance of RTMPStream (See class RTMPStream)

createServer([options])

Creates an RTMP server

params

Name	Type	Required	Default	Description
options	object	No	{}	An object holding option values that are used to override the internal option values

supported options

Name	Type	Default	Description
port	number	1935	The port number this server listens for
maxConnectionNum	number	1	The number of connections that can be established concurrently
maxStreamNum	number	1	The number of streams the client can publish concurrently for each connection

return value

An instance of RTMPServer (See class RTMPServer)

class RTMPServer extends EventEmitter

Represents an RTMP server

methods

All methods are inherited from EventEmitter

on(event, listener)

A method used to listen for a specific event

Name	Type	Required	Default	Description
event	string	Yes	N/A	event should be 'error' or a specific path within the RTMP server
listener	function	Yes	N/A	If event equals to 'error', listener should be a function that takes an Error object. Otherwise, listener should be a function that takes an RTMPConnection object.

return value

A reference to the RTMPServer, so that calls can be chained.

class RTMPConnection extends EventEmitter

Represents a connection from an RTMP client

properties

Name	Type	Description
path	string	The path string the client specified on connection as a part of URL. (e.g. rtmp://example.com/{path})

methods

All methods are inherited from EventEmitter

on(event, listener)

A method used to listen for a specific event

Name	Type	Required	Default	Description
event	string	Yes	N/A	event should be 'error' or a stream name with which the stream is published by the client. The stream name can be '*' which matches any names.
listener	function	Yes	N/A	If event equals to 'error', listener should be a function that takes an Error object. Otherwise, listener should be a function that takes an RTMPStream object.

return value

A reference to the RTMPConnection, so that calls can be chained.

class RTMPStream extends stream.Readable

Represents a stream of messages published by the RTMP client. The published audio, video, and data messages can be read from the stream. See Data format

properties

Name	Type	Description
name	string	The stream name with which the stream is published by the client.

methods

All methods are inherited from stream.Readable

Data format

This section describes the structure of the messages that can be read from RTMPStream

Message

Property	Type	Required	Default	Description
type	string	Yes	N/A	Either of {'video'/'audio'/'data'}
timestamp	number	Yes	N/A	An integer value that represents an absolute timestamp in millisecond that wraps around every 32 bit

Video (extends Message)

Property	Type	Required	Default	Description
data	AVC	Yes	N/A	An isntance of AVC (See @mediafish/flv)

Audio (extends Message)

Property	Type	Required	Default	Description
data	AAC	Yes	N/A	An isntance of AAC (See @mediafish/flv)

Data (extends Message)

Property	Type	Required	Default	Description
data	Array	Yes	N/A	An array that contains objects, string, or number