Set up the source stream using GStreamer

Use GStreamer, a command-line tool to configure your source stream.

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We recommend using GStreamer v1.18 or later.

Example

gst-launch-1.0 -v
    videotestsrc ! video/x-raw,width=1920,height=1080,framerate=30/1 !
    x264enc tune=zerolatency bitrate=500 speed-preset=superfast key-int-max=60 !
    h264parse ! queue ! mux.
    audiotestsrc ! audio/x-raw,rate=44100 !
    voaacenc bitrate=128000 ! queue ! mux.
    flvmux streamable=true name=mux !
    rtmpsink location="rtmp://<rtmp-server-ip-or-url>/<path>"

Command breakdown

Let’s break down each part of the command in detail:

Video component

Command	Description
videotestsrc	This is a test video source in GStreamer, which generates a test pattern. Replace this with your actual video source (e.g. v4l2src for webcams).
video/x-raw,width=1920,height=1080,framerate=30/1	This caps filter sets the resolution and framerate of the raw video (1920x1080 sets the resolution to 1080p).
x264enc	This encodes the video to H.264. Commonly used options: tune=zerolatency: Lowers latency, which is essential for live streaming.bitrate=500: Sets the bitrate to 500 kbps. Adjust as needed based on network conditions and quality requirements. speed-preset=superfast: Defines the encoding speed. superfast offers low latency at the cost of higher bandwidth; adjust as needed. key-int-max=60: Sets the keyframe interval to 60 frames, which is 2 seconds at 30 frames per second (FPS). This value needs to match the Input key frame intervalset in MK.IO UI . h264parse: Ensures the video stream is in the correct H.264 format for RTMP.

Audio component

Command	Description
audiotestsrc	A test audio source for generating sample audio. Replace with your own audio source.
voaacenc	Encodes the audio to AAC, which is compatible with RTMP.
queue	Adds buffers between streams to help with sync issues.

RTMP component

Command	Description
flvmux	Packs the H.264 video (and audio if included) into an FLV container, suitable for RTMP.
rtmpsink	Sends the output stream to an RTMP server.
location="rtmp://<rtmp-server-ip-or-url>/<path>"	The RTMP input URL for your streaming destination, provided by MK.IO when creating a Live Event.