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OvenMediaEngine supports multiple protocols for input from various live sources, without compromising basic usability. This allows you to publish a variety of live sources with sub-second latency. See the sub-page for more information.
OvenMediaEngine can pull RTSP Stream in two ways. The first way is to use the Stream creation API, and the second way is to use OriginMap or OriginMapStore. The supported codecs are H.264, AAC(ADTS). Supported codecs will continue to be added.
You can create a stream by pulling an RTSP stream using the Stream Creation API. For more information on using the REST API, check out that chapter.
If OriginMapStore is configured and Redis Server provides an rtsp URL, OvenMediaEngine pulls the RTSP URL when a playback request comes in. Check out OriginMapStore for more details.
RTSP Pull is provided through OriginMap configuration. OriginMap is the rule that the Edge server pulls the stream of the Origin server. Edge server can pull a stream of origin with RTSP and OVT (protocol defined by OvenMediaEngine for Origin-Edge) protocol. See the Clustering section for more information about OVT.
For example, in the above setup, when a player requests "ws://ome.com/app_name/rtsp_stream_name" to stream WebRTC, it pulls the stream from "rtsp://192.168.0.200:554" and publishes it to WebRTC.
If the app name set in Location isn't created, OvenMediaEngine creates the app with default settings. The default generated app doesn't have an OPUS encoding profile, so to use WebRTC streaming, you need to add the app to your configuration.
Pulling type providers are activated by streaming requests from publishers. And by default, the provider is automatically disabled after 30 seconds of no client playback. If you want to change this setting, check out the Clustering chapter.
When a playback request comes in from the following URL, RTSP pull starts working according to Origins settings.
Protocol
URL
WebRTC
ws[s]:://host.com[:port]/app_name/rtsp_stream_name
LLHLS
http[s]://host.com[:port]/app_name/rtsp_stream_name/llhls.m3u8
Providers ingests streams that come from a media source. OvenMediaEngine supports RTMP protocol. You can set it in the configuration as follows:
When a live source inputs to the <Application>, a stream is automatically created in the <Application>. The created stream is passed to Encoder and Publisher.
If you set up a live stream using an RTMP-based encoder, you need to set the following in Server.xml:
<BlockDuplicateStreamName> is a policy for streams that are inputted as overlaps.
<BlockDuplicateStreamName> works with the following rules:
true
Default Rejects the new stream inputted as overlap and maintains the existing stream.
false
Accepts a new stream inputted as overlap and disconnects the existing stream.
To allow the duplicated stream name feature can cause several problems. When a new stream is an input the player may be disconnected. Most encoders have the ability to automatically reconnect when it is disconnected from the server. As a result, two encoders compete and disconnect each other, which can cause serious problems in playback.
If you want to publish the source stream, you need to set the following in the Encoder:
URL RTMP://<OvenMediaEngine IP>[:<RTMP Listen Port>]/<App Name]>
Stream Key Stream Name
If you use the default configuration, the <RTMP><ListenPort> is 1935, which is the default port for RTMP. So it can be omitted. Also, since the Application named app is created by default in the default configuration, you can enter app in the [App Name]. You can define a Stream Key and use it in the Encoder, and the Streaming URL will change according to the Stream Key.
Moreover, some encoders can include a stream key in the URL, and if you use these encoders, you need to set it as follows:
URL RTMP://<OvenMediaEngine IP>[:<RTMP Listen Port>/<App Name>/<Stream Name>
If you are using the default configuration, press the URL button in the top right corner of OvenStreamEnoder, and enter the URL as shown below:
Also, <App name> and <Stream name> can be changed and used as desired in the configuration.
If you use the default configuration, set the OBS as follows:
You can set the Stream Key to any name you like at any time.
Secure Reliable Transport (or SRT in short) is an open source video transport protocol and technology stack that optimizes streaming performance across unpredictable networks with secure streams and easy firewall traversal, bringing the best quality live video over the worst networks. We consider SRT to be one of the great alternatives to RTMP, and OvenMediaEngine can receive video streaming over SRT. For more information on SRT, please visit the SRT Alliance website.
SRT uses the MPEG-TS format when transmitting live streams. This means that unlike RTMP, it can support many codecs. Currently, OvenMediaEngine supports H.264, H.265, and AAC codecs received by SRT.
Set the SRT listen port as follows:
SRT input can be turned on/off for each application. As follows Setting enables the SRT input function of the application.
There are various encoders that support SRT such as FFMPEG, OBS Studio, and srt-live-transmit. Please check the specifications of each encoder on how to transmit streams through SRT from the encoder. We describe an example using OBS Studio.
OvenMediaEngine classifies each stream using SRT's streamid. This means that unlike MEPG-TS/udp, OvenMediaEngine can receive multiple SRT streams through one port. For more information on streamid, see Haivision's official documentation.
Therefore, in order for the SRT encoder to transmit a stream to OvenMediaEngine, the following information must be included in the streamid as percent encoded.
streamid = percent_encoding("srt://{host}[:port]/{app name}/{stream name}[?query=value]")
The streamid contains the URL format, so it must be percent encoded****
OBS Studio 25.0 or later supports SRT. Please refer to the OBS official documentation for more information. Enter the address of OvenMediaEngine in OBS Studio's Server as follows: When using SRT in OBS, leave the Stream Key blank.
srt://{full domain or IP address}:port?streamid=srt%3A%2F%2F{full domain or IP address}[%3APort]%2F{App name}%2F{Stream name}&latency=2000000
The streamid has to be the urlencoded address of the server name as specified in the ome server configuration plus the app name and the stream name, each separated by /. The latency configures the size of the server-side recive buffer and the time limit for SRT in nanoseconds. Typical value for latency are 150000 (150ms) for stremaing to a server in the local network, 600000 (600ms) for streaming to a server over the internet in the local region, and 2000000 (2 seconds) when stremaing over long distance.
For configuring a Blackmagic Web Presenter, ATEM Mini Pro or similar device to stream to OvenMediaEngine over SRT, choose the "Custom URL H264/H265" platform option with the following syntax:
The default streaming profiles work well, and there are more advanced configuration options available if you edit the streaming.xml settings file
You can configure SRT's socket options of the OvenMediaEngine server using <Options>. This is particularly useful when setting the encryption for SRT, and you can specify a passphrase by configuring as follows:
For more information on SRT socket options, please refer to https://github.com/Haivision/srt/blob/master/docs/API/API-socket-options.md#list-of-options.
User can send video/audio from web browser to OvenMediaEngine via WebRTC without plug-in. Of course, you can use any encoder that supports WebRTC transmission as well as a browser.
OvenMediaEngine supports self-defined signaling protocol and WHIP for WebRTC ingest.
You can set the port to use for signaling in <Bind><Provider><WebRTC><Signaling>. <Port> is for setting an unsecured HTTP port, and <TLSPort> is for setting a secured HTTP port that is encrypted with TLS.
For WebRTC ingest, you must set the ICE candidates of the OvenMediaEnigne server to <IceCandidates>. The candidates set in <IceCandate> are delivered to the WebRTC peer, and the peer requests communication with this candidate. Therefore, you must set the IP that the peer can access. If the IP is specified as *, OvenMediaEngine gathers all IPs of the server and delivers them to the peer.
<TcpRelay> means OvenMediaEngine's built-in TURN Server. When this is enabled, the address of this turn server is passed to the peer via self-defined signaling protocol or WHIP, and the peer communicates with this turn server over TCP. This allows OvenMediaEngine to support WebRTC/TCP itself. For more information on URL settings, check out WebRTC over TCP.
WebRTC input can be turned on/off for each application. As follows Setting enables the WebRTC input function of the application. The <CrossDomains> setting is used in WebRTC signaling.
OvenMediaEnigne supports self-defined signaling protocol and WHIP for WebRTC ingest.
The signaling URL for WebRTC ingest uses the query string ?direction=send as follows to distinguish it from the url for WebRTC playback. Since the self-defined WebRTC signaling protocol is based on WebSocket, you must specify ws[s] as the scheme.
ws[s]://<host>[:signaling port]/<app name>/<stream name>?direction=send
For ingest from the WHIP client, put ?direction=whip in the query string in the signaling URL as in the example below. Since WHIP is based on HTTP, you must specify http[s] as the scheme.
http[s]://<host>[:signaling port]/<app name>/<stream name>?direction=whip
WebRTC transmission is sensitive to packet loss because it affects all players who access the stream. Therefore, it is recommended to provide WebRTC transmission over TCP. OvenMediaEngine has a built-in TURN server for WebRTC/TCP, and receives or transmits streams using the TCP session that the player's TURN client connects to the TURN server as it is. To use WebRTC/TCP, use transport=tcp query string as in WebRTC playback. See WebRTC/tcp playback for more information.
ws[s]://<host>[:port]/<app name>/<stream name>?direction=send&transport=tcp
http[s]://<host>[:port]/<app name>/<stream name>?direction=whip&transport=tcp
To use WebRTC/tcp, <TcpRelay> must be turned on in <Bind> setting.
If <TcpForce> is set to true, it works over TCP even if you omit the ?transport=tcp query string from the URL.
We provide a demo page so you can easily test your WebRTC input. You can access the demo page at the URL below.
The getUserMedia API to access the local device only works in a secure context. So, the WebRTC Input demo page can only work on the https site **** https://demo.ovenplayer.com/demo_input.html. This means that due to mixed content you have to install the certificate in OvenMediaEngine and use the signaling URL as wss to test this. If you can't install the certificate in OvenMediaEngine, you can temporarily test it by allowing the insecure content of the demo.ovenplayer.com URL in your browser.
To create a custom WebRTC Producer, you need to implement OvenMediaEngine's Self-defined Signaling Protocol or WHIP. Self-defined protocol is structured in a simple format and uses the same method as WebRTC Streaming.
When the player connects to ws[s]://host:port/app/stream?direction=send through a web socket and sends a request offer command, the server responds to the offer sdp. If transport=tcp exists in the query string of the URL, iceServers information is included in offer sdp, which contains the information of OvenMediaEngine's built-in TURN server, so you need to set this in RTCPeerConnection to use WebRTC/TCP. The player then setsRemoteDescription and addIceCandidate offer sdp, generates an answer sdp, and responds to the server.
Scheduled Channel that allows you to create a live channel by scheduling pre-recorded files has been added to OvenMediaEngine. Other services or software call this Pre-recorded Live or File Live, but OvenMediaEngine plans to expand the function to organize live channels as a source, so we named it Scheduled Channel.
To use this feature, activate Schedule Provider as follows.
MediaRootDir
Root path where media files are located. If you specify a relative path, the directory where the config file is located is root.
ScheduleFileDir
Root path where the schedule file is located. If you specify a relative path, the directory where the config file is located is root.
Scheduled Channel creates/updates/deletes streams by creating/editing/deleting files with the .sch extension in the ScheduleFileDir path. Schedule files (.sch) use the following XML format. When a <Stream Name>.sch file is created in ScheduleFileDir, OvenMediaEngine analyzes the file and creates a Schedule Channel with <Stream Name>. If the contents of <Stream Name>.sch are changed, the Schedule Channel is updated, and if the file is deleted, the stream is deleted.
Stream (required)
This is the stream information that the Channel needs to create.
Stream.Name (optional)
It's the stream's name. This is a reference value extracted from the file name for usage. It's recommended to set it same for consistency, although it's for reference purposes.
Stream.BypassTranscoder (optional, default: false)
Set to true if transcoding is not desired.
Stream.VideoTrack (optional, default: true)
Determines whether to use the video track. If VideoTrack is set to true and there's no video track in the Item, an error will occur.
Stream.AudioTrack (optional, default: true)
Determines whether to use the audio track. If AudioTrack is set to true and there's no audio track in the Item, an error will occur.
FallbackProgram (optional)
It is a program that switches automatically when there is no program scheduled at the current time or an error occurs in an item. If the program is updated at the current time or the item returns to normal, it will fail back to the original program. Both files and live can be used for items in FallbackProgram. However, it is recommended to use a stable file.
Program (optional)
Schedules a program. The name is an optional reference value. If not set, a random name will be assigned. Set the start time in ISO8601 format in the scheduled attribute. Decide whether to repeat the Items when its playback ends.
Program.Item (optional)
Configures the media source to broadcast.
The url points to the location of the media source. If it starts with file://, it refers to a file within the MediaRootDir directory. If it starts with stream://, it refers to another stream within the same OvenMediaEngine. stream:// has the following format: stream://vhost_name/app_name/stream_name
For 'file' cases, the start attribute can be set in milliseconds to indicate where in the file playback should start.
duration indicates the playback time of that item in milliseconds. After the duration ends, it moves to the next item.
Both 'start' and 'duration' are optional. If not set, start defaults to 0, and duration defaults to the file's duration; if not specified, the media file will be played until its full duration.
This function is a scheduling channel, but it can be used for applications such as creating a permanent stream as follows.
This channel normally plays default/app/input, but when live input is stopped, it plays the file in FallbackProgram. This will last forever until the .sch file is deleted. One trick was to set the origin program's schedule time to year 2000 so that this stream would play unconditionally.
You may experience some buffering when going from file to live. This is unavoidable due to the nature of the function and low latency. If this is inconvenient, buffering issues can disappear if you add a little delay in advance by setting PartHoldBack in LLHLS to 5 or more. It is a choice between delay and buffering.
ScheduledChannel can also be controlled via API. Please refer to the page below.
From version 0.10.4, MPEG-2 TS input is supported. The supported codecs are H.264, AAC(ADTS). Supported codecs will continue to be added. And the current version only supports basic MPEG-2 TS with 188 bytes packet size. Since the information about the input stream is obtained using PAT and PMT, the client must send this table information as required.
To enable MPEG-2 TS, you must bind the ports fist and map the bound ports and streams.
To use multiple streams, it is necessary to bind multiple ports, so we provide a way to bind multiple ports as in the example below. You can use the dash to specify the port as a range, such as Start port-End port, and multiple ports using commas.
First, name the stream and map the port bound above. The macro ${Port} is provided to map multiple streams at once. Check out the example below.
This is an example of publishing using FFMPEG.
Giving the -pes_payload_size 0 option to the AAC codec is very important for AV synchronization and low latency. If this option is not given, FFMPEG bundles several ADTSs and is transmitted at once, which may cause high latency and AV synchronization errors.
Now with Multiplex Channel, you can configure ABR by combining multiple input streams into one, or duplicate external streams and send them to other applications.
Multiplex Channel takes tracks from other local streams and organizes them into its own tracks. This will pull in tracks that have already been encoded, which can be useful if you want to change codecs or adjust the quality once again. And the Multiplex Channel is sent to the publisher, unconditionally bypassing the encoder.
To use this feature, enable Multiplex Provider in Server.xml.
Multiplex Channels are created through .mux files or API. MuxFilesDir is the path where the .mux files are located and can be set to an absolute system path or relative to the path where the Server.xml configuration is located.
The Multiplex Provider monitors the MuxFilesDir path, and when a mux file is created, it parses the file and creates a multiplex channel. When the mux file is modified, the channel is deleted and created again, and when the mux file is deleted, the channel is deleted.
mux files can be created or deleted while the system is running. This works dynamically. The mux file has the format below.
OutputStream
This is information about the stream to be newly created. It must be the same as the file name. <stream name>.mux
SourceStreams
Specifies the internal stream to be muxed. You can also load streams from other VHosts or applications in the format stream://<vhost name>/<app name>/<stream name>. Because multiple streams are muxed into one stream, track names may be duplicated. Therefore, it is necessary to change the Track name for each SourceStream through <TrackMap>. <SourceTrackName> is either <OutputProfile><Encodes><Video><Name> or <OutputProfile><Encodes><Audio><Name>.
Playlist
The same format as <OutputProfile> must be used, and the Playlist must be constructed using the newly mapped Track name in SourceStreams' TrackMap. The Playlist configured here exists only in this stream. The Playlist's FileName must be unique throughout the application.
MultiplexChannel can also be controlled via API. Please refer to the page below.
