GStreamer

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Setup

1. Install GStreamer and the required plugins. Download instructions are available on gstreamer.freedesktop.org. The pipelines below require the following plugin packages:
   • gstreamer1.0-plugins-ugly — provides x264enc for H.264 encoding
   • gstreamer1.0-libav — provides avenc_aac for AAC encoding
   • gstreamer1.0-plugins-good — provides flvmux, rtpbin, and other elements
2. In the Gcore Customer Portal, navigate to Streaming → Live Streaming, then open the live stream settings for the target stream. In the URLs for encoder section, select the protocol to use:
   • RTMP — copy the Server URL and Stream Key. Append the Stream Key to the Server URL to form the full ingest URL: rtmp://vp-push-ed2.gvideo.co/in/{STREAM_ID}?{TOKEN}
   • SRT — copy the full SRT URL. The URL format is srt://vp-push-ed2-srt.gvideo.co:5001?streamid={STREAM_ID}#{TOKEN}

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Pushing via RTMP

gst-launch-1.0 -v \
    videotestsrc is-live=true pattern=smpte ! \
        video/x-raw,format=I420,width=1920,height=1080,framerate=30/1 ! \
        x264enc tune=zerolatency bitrate=3000 speed-preset=veryfast key-int-max=60 bframes=0 ! \
        h264parse config-interval=1 ! queue ! mux. \
    audiotestsrc is-live=true wave=sine ! \
        audio/x-raw,channels=2,rate=48000 ! \
        avenc_aac bitrate=128000 ! queue ! mux. \
    flvmux name=mux streamable=true ! \
    rtmpsink location="rtmp://vp-push-ed2.gvideo.co/in/{STREAM_ID}?{TOKEN}"

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Pushing via SRT

gst-launch-1.0 -v \
    videotestsrc is-live=true pattern=smpte ! \
        video/x-raw,format=I420,width=1920,height=1080,framerate=30/1 ! \
        x264enc tune=zerolatency bitrate=3000 speed-preset=veryfast key-int-max=60 bframes=0 ! \
        h264parse config-interval=1 ! queue ! mux. \
    audiotestsrc is-live=true wave=sine ! \
        audio/x-raw,channels=2,rate=48000 ! \
        avenc_aac bitrate=128000 ! queue ! mux. \
    mpegtsmux name=mux ! \
    srtsink uri="srt://vp-push-ed2-srt.gvideo.co:5001" \
            mode=caller latency=1500 \
            streamid="{STREAM_ID}#{TOKEN}"

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Pipeline notes

• videotestsrc pattern=smpte and audiotestsrc wave=sine are synthetic sources that produce color bar video and a sine tone. Use them to verify the pipeline without a physical camera. Replace them with the appropriate GStreamer source elements when streaming from a real device or file.
• x264enc tune=zerolatency combined with key-int-max=60 and bframes=0 produces a keyframe every 2 seconds at 30 fps and avoids B-frames, keeping latency low for live ingest.
• For this RTMP pipeline, flvmux streamable=true produces a live FLV stream suitable for RTMP ingest — it enables output of the FLV header before all streams are configured.
• mpegtsmux multiplexes H.264 and AAC into MPEG-TS, the container used by Gcore SRT ingest. This is why RTMP uses flvmux and SRT uses mpegtsmux.