How to stream camera video to external devices.

The udpsink element sends udp-packages to a certain host(target) or by a multicast address. This is specified by parameters to the launch.sh command or to the executable itself.

Building the streamer

The GStreamerCameraAppSource is built with

jetson-scripts/build-gstreamer-camera-appsource

Running the app

Start the stream after you set up the viewer

The launch.sh is useful because it add the runtime library path to the environment before execution.

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/home/ubuntu/gstreamer-build/out/lib/

./launch.sh -udp 1234 10.13.0.106 100

1234 is the port the target machine is listening on
10.13.0.106 is the IP address of the viewer
100 is the number of frames to capture (use 0 for infinite stream. Default=60)

Viewing the stream

The simplest way to wiew the stream on you target device is to use gst-launch-1.0. The following pipeline unwraps the stream to a autovideosink

gst-launch-1.0 udpsrc port=1234 ! "application/x-rtp, payload=127" ! rtph264depay ! decodebin ! autovideosink sync=false

This is basically just a reversal of the packaging to udpsink

Another option is to use glimagesink

gst-launch-1.0 udpsrc port=1234 ! "application/x-rtp, payload=127" ! rtph264depay ! decodebin ! glimagesink

This reports dropped buffers on my machine though.

To use the stream using ffmpeg

ffmpeg  -protocol_whitelist rtp,file,http,https,tcp,udp,tls  -i sample_sdp_file.sdp -f opengl "3DLab room"

This is the method being used by the output clients (with a custom output).

commit: $Id: gst.udp-streaming.md 735 2018-06-05 13:55:50Z martin $