SRT (MPEG-TS) streaming

Secure Reliable Transport (SRT) is an open-source streaming protocol designed to deliver low-latency video across unpredictable networks like the Internet. Developed by Haivision, SRT uses encryption and error-correction mechanisms to ensure secure and reliable data transmission. By adapting to changing network conditions in real time, it minimizes jitter, packet loss, and bandwidth fluctuations. SRT supports features like packet retransmission and congestion control, making it ideal for live video streaming, remote contribution, and other latency-sensitive applications in broadcasting and media.

Video and audio streams will be muxed into an MPEG-TS container and sent over the SRT protocol.

Use the SRTSinkSettings class to set the parameters.

Block info

Name: SRTMPEGTSSinkBlock.

Pin direction	Media type	Pins count
Input audio	audio/mpeg [1,2,4]	one or more
	audio/x-lpcm
	audio/x-ac3
	audio/x-dts
	audio/x-opus
Input video	video/mpeg [1,2,4]	one or more
	video/x-dirac
	video/x-h264
	video/x-h265
Input subtitle	meta/x-klv	one or more
	subpicture/x-dvb
	application/x-teletext

The sample pipeline

Sample code

// Pipeline
var pipeline = new MediaBlocksPipeline();

// video and audio sources
var virtualVideoSource = new VirtualVideoSourceSettings
{
    Width = 1280,
    Height = 720,
    FrameRate = VideoFrameRate.FPS_25,
};

var videoSource = new VirtualVideoSourceBlock(virtualVideoSource);

var virtualAudioSource = new VirtualAudioSourceSettings
{
     Channels = 2,
     SampleRate = 44100,
};

var audioSource = new VirtualAudioSourceBlock(virtualAudioSource);

// H264/AAC encoders
var h264Encoder = new H264EncoderBlock(new OpenH264EncoderSettings());
h264Encoder.Settings.ParseStream = false; // we have to disable parsing for SRT for H264 and HEVC encoders
var aacEncoder = new AACEncoderBlock();

pipeline.Connect(videoSource.Output, h264Encoder.Input);
pipeline.Connect(audioSource.Output, aacEncoder.Input);

// Sink
var sink = new SRTMPEGTSSinkBlock(new SRTSinkSettings() { Uri = "srt://:8888" });
pipeline.Connect(h264Encoder.Output, sink.CreateNewInput(MediaBlockPadMediaType.Video));
pipeline.Connect(aacEncoder.Output, sink.CreateNewInput(MediaBlockPadMediaType.Audio));

// Start
await pipeline.StartAsync();

Sample applications

• Network Streamer Demo

Platforms

Windows, macOS, Linux, iOS, Android.