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Data Source Types

A source is from where Flussonic receives a stream of video data. A source can be an IP camera, a satellite headend, an HTTP server, and so on. To specify the source of a stream, you need to know its address and the video protocol over which Flussonic receives video data, in other words, you need to know the URL.

The url parameter in the stream settings specifies the source of a video stream. For example:

stream demo {
  url udp://;

This page includes examples of URLs for various protocols and other types of sources.

What not to specify as a source via the url parameter

  • Flussonic Media Server does not support the http data source type, and specifying an URL as http://host/path will result in an error. You should use a URL that explicitly specifies a video protocol — HTTP MPEG-TS, HLS or any other protocol supported by the system.

  • Broadcasting of files is configured differently from live sources. Learn more in VOD file broadcasting.

Important. To send video data between two or more Flussonic Media Servers we recommend using Flussonic's internal protocol M4F.

On this page:

M4F and M4S

We recommend using M4F or M4S for sending video between Flussonic servers. They are both Flussonic-to-Flussonic protocols.

M4F is a segmented protocol recommended for any TV purposes, for mass video broadcasting. M4F is ideal for setting up replication of a DVR archive or for re-streaming individual streams in a cluster of Flussonic servers.

  • m4f:// — example

About the M4F protocol

M4S is a real-time streaming protocol, ideal to restream live video, such as video calls, and to stream games with a low delay between Flussonic servers.

  • m4s:// — example

M4S allows ingest of only certain tracks from a source:

  • m4s://FLUSSONIC_HOST/STREAM_NAME/tracks-v2a1 — getting the 2nd video track and the 1st audio track.

If you have difficulty choosing between M4F and M4S, use m4f:// — it is a universal solution.


  • tshttp://hostname:port/stream — syntax (ingest over HTTP)
  • tshttps://hostname:port/stream — syntax (ingest over HTTPS)
  • tshttp:// — example of a URL

An HTTP MPEG-TS data source is, for example, VLC.


SPTS (Single-Program Transport Stream)

  • udp://MULTICAST-IP:PORT program=N — syntax (ingest over UDP), where parameter program specifies the program number N
  • udp:// — multicast URL
  • udp:// — ingest of a multicast stream through the specified interface
  • udp:// — unicast URL, where is the source IP. Flussonic is filtering input UDP unicast by specified IP
  • udp:// — SSM ingest (Source Specific Multicast)

MPTS (Multiprogram Transport Stream)

  • mpts-udp://MULTICAST-IP:PORT program=N — syntax (ingest over UDP), where parameter program specifies the program number N
  • mpts-udp:// program=2001 — ingest of a specified program of a multicast stream.

Learn more about MPTS.


A TCP MPEG-TS data source:

  • tstcp://


  • hls://HOSTNAME/PATH/TO/MANIFEST.m3u8 — syntax
  • hls:// — example of an HLS URL
  • hls:// — example of an HLS URL.
  • hlss://HOSTNAME/PATH/TO/MANIFEST.m3u8 — syntax of ingest over HTTPS

A generic HTTP server could serve a pre-packaged HLS manifest and chunks with video data. In the case where the manifest file is static Flussonic would not be able to ingest HLS stream. Flussonic Media Server will wait for new segments to appear until till timeout, then it will restart this source and try to fetch again the existing segments.

It is possible to validate a playlist by its modification time, but this method is not very reliable. By default, Flussonic Media Server has enabled feature called "stalled check". Here, the server downloads only the new segments after the first fetch, making sure that no segments from first fetch will be used.

Sometimes you would want to make sure that your source is not a generic HTTP server, but a streaming server that will not serve outdated segments and you want to enable HLS source in ondemand configuration.

To make sure that your streaming server would not serve outdated segments in ondemand you should use this option.

Stale protection option affects stream startup time, when this option is enabled Flussonic Media Server will wait for at least 2-3 new segments before making stream available.

You can disable stale protection with this directive: skip_stalled_check=true;

Use this feature at your own risk — with it enabled, old content might be repeated over and over.

stream origin {
  url fake://fake;
stream input_hls {
  url hls://localhost:80/origin/index.m3u8 skip_stalled_check=true;

For HLS sources you can set the user_agent option:

hls://source:80/stream/index.m3u8 user_agent="Custom Agent v1.2"


When receiving a stream from an RTSP camera, you should include the camera's IP address and the path to its RTSP stream in the URL. The path is not always published in the camera's user manual. You might need to contact the camera's vendor or manufacturer to get this information.

  • rtsp://hostname/path — syntax
  • rtsp://user:password@ip/path — URL with authorization
  • rtsp2://hostname/path — the rtsp2 protocol instructs Flussonic to transcode the audio stream into AAC. Learn more
  • rtsp:// — example of an RTSP URL

You can use the tracks=1 option to receive only video track.

stream fake {
  url fake://fake;
stream input_rtsp {
  url rtsp://localhost/fake tracks=1;


  • rtmp://hostname/application/stream
  • rtmp://

stream clock {
 url fake://fake;
stream input_rtmp {
 url rtmp://localhost:1935/static/clock;

The RTMP protocol requires that an RTMP URL has at least two segments. The first segment (application) is by default used as the name of the RTMP application.

If the name of the RTMP application on the server consists of more than one segments, add two slashes to the URL in order to explicitly divide the RTMP application and stream name.


  • file://vod-location/file.mp4 syntax
  • file://vod/bunny.mp4 a real configuration, more details about VOD path read here

Flussonic can create a loop-stream from any .mp4 or .ts file. Specify a stream source using the file:// schema.

DVB-S cards

  • url mpts-dvb://a0?program=1234

The scheme mpts-dvb:// allows capturing video from a DVB-S card directly into Flussonic. Learn more


  • timeshift://STREAM/3600

The timeshift:// is a scheme that allows you to create a new stream identical to the stream but with a predefined delay. In this example the delay is 3600 seconds (one hour). It is delivered from the recorded archive.


  • shoutcast://
  • shoutcasts://

SHOUTcast is a protocol for streaming audio over an HTTP connection. Use shoutcast:// scheme to ingest SHOUTcast and ICEcast internet radio streams (shoutcasts:// for HTTPS sources).


Flussonic supports capturing SRT streams. In this case Flussonic acts as an SRT Caller, initiating the connection.

Let's see how to configure an SRT stream ingest.

Global port

For Flussonic to ingest an SRT stream over a global port you should specify the URL:


Stream name in streamid is required.

  • SRT parameters in the URL parameters:

srt://SRT-SOURCE:SRT_PORT streamid="#!::m=request,r=STREAM_NAME"

  • SRT parameters in the URL query string:



  • SRT-SOURCE is an IP address of an SRT source server.

  • SRT_PORT is an SRT port of an SRT source server.

  • r=STREAM_NAME is the name of a stream to ingest.

For example:

stream ingest_srt {
  url srt://SRT-SOURCE:8888 streamid="#!::m=request,r=srt_stream";

In the example above we enabled an ingest of a srt_stream stream over global port 8888.

Stream port

To enable Flussonic ingest the stream over a stream port set the URL according to the following format:


Stream name in streamid is not required.

  • SRT parameters in the URL parameters:

srt://SRT-SOURCE:SRT_PORT streamid="#!::m=request"

  • SRT parameters in the URL query:


Let's have a look at the usage example:

stream ingest_srt {
  url srt://SRT-SOURCE:7777 streamid="#!::m=request";

In the example above we set stream port 7777 to ingest an SRT stream.

Flussonic allows you to manage the ingest of the SRT streams by setting parameters.

Parameters for an SRT ingest

Here is a list of parameters to manage an SRT ingest:

Parameters Unit Description Example
streamid string A string that is set on the socket before the connection. Maximum length equals to 512 characters. Default value is an empty string ("") streamid="#!::r=pub,m=publish"
minversion 0xXXYYZZ or x.y.z The minimum SRT version that is required from the peer. minversion=1.1.0.
version 0xXXYYZZ or x.y.z Required SRT version. version=1.3.0.
enforcedencryption boolean If set to true, both connection parties must have the same password set (including empty, in other words, with no encryption). If the password doesn’t match or only one side is unencrypted, the connection is rejected. Set to true by default. enforcedencryption=false
passphrase string Password for the encrypted transmission. Its length should be not less than 10 and not more than 79 characters. Default value is an empty string ("") passphrase=9876543210
timeout seconds If set to -1 then data transmission time is unlimited. Default behavior. timeout=1
linger seconds The time socket waits for the unsent data when closing. Set to 180 by default. linger=1
connect_timeout seconds Connection timeout. Equals to 0 by default. connect_timeout=2
latency milliseconds Packet delivery delay. Used to absorb bursts of missed packet retransmissions. Default value is set to 120. latency=100

Example with passphrase:

stream ingest_srt {
  url srt://SRT-SOURCE:9999 passphrase=0987654321 streamid="#!::m=request";


stream ingest_srt {
  url srt://SRT-SOURCE:9999?streamid=#!::m=request&passphrase=0987654321;

In the examples above we secured stream port 9999 with passphrase.

Besides, here you can find a few parameters to specify in streamid as well:

  • u=USERNAME is a username. Flussonic uses it as a token for an ingest session authorization.

  • a=USER_AGENT is a user agent. Used in the ingest session authorization.


  • h323://

The scheme h323:// is used to ingest video via the VoIP protocol H323. Learn more


  • mixer://stream1,stream2

Use the scheme mixer:// to mux video from the first specified stream with audio from the second one. Learn more


  • mosaic://cam1,cam2,cam3,cam4?fps=20&preset=ultrafast&bitrate=1024k&size=340x240&mosaic_size=4

Use the scheme mosaic:// to create a mosaic — a combination of multiple video streams in one. Learn more

MPEG-TS options

When working with tshttp://, udp://, and tstcp:// sources, you can use MPEG2-TS specific options.

Ingesting specific MPEG-TS programs and PIDs

stream clock {
  url fake://fake;
stream example {
  url tshttp://localhost:80/clock/mpegts program=1 pids=211;

Subtitles options

You can manage DVB subtitles in an output stream with the option subtitles, which has the following values:

  • drop — an output stream will have no subtitles track. See the example in Disabling subtitles below.
  • accept — an output stream will have a subtitles track in DVB, without conversion to text.
  • ocr_replace — an output stream will have a track containing subtitles converted to a text format (WebVTT).
  • ocr_add — an output stream will have two tracks containing subtitles: the original track with subtitles in DVB and a new track with text subtitles.

Accepting subtitles

By default, Flussonic Media Server always ingests subtitles from published streams. This is true for streams with either static or dynamic names. You generally don't need to explicitly set the option subtitles=accept.

Disabling subtitles

If you do not need subtitles in a stream, set the option subtitles to drop:

stream origin {
  url file://vod/subs.ts;
stream example {
  url tshttp://localhost:80/origin/mpegts subtitles=drop;


For live published streams (streams with dynamic names), subtitles are always ingested and cannot be disabled. The subtitles=drop option will not work.

The option allow_subtitles is now deprecated and supported only for backward compatibility.

Converting subtitles

Learn more about recognition and conversion of DVB subtitles in Converting DVB Subtitles to WebVTT

Editing the Language descriptor in the Program Map Table (PMT)

If an incoming MPEG-TS stream does not have the Language descriptor in audio PIDs, there might be problems playing on set-top-boxes, for example, if a certain language was set as preferred.

Flussonic 20.05 allows setting or editing the language for audio tracks in output MPEG-TS. For this the option lang in an input stream settings is used. It sets the ISO 639 language codes:

stream example {
  url tshttp://localhost:8080/example1/mpegts lang.default=eng lang.a1=eng lang.a2=rus;
stream example1 {
  url file://vod/multilang2.ts;

This coniguration adds the Language descriptors to the PMT of an output stream.

HTTP options

When connecting to a stream over HTTP, you can set the User-Agent HTTP header with the user_agent option:

stream example {
  url tshttp://source:80/stream user_agent="VLC"

To specify a custom HTTP header, for example, Referer:

stream example {
  url tshttp://source:80/stream header.Referer=;

These options are found on the Input > Options page in the web interface.