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ZED GStreamer plugins

GStreamer plugins for the ZED stereo camera family

Key Features • Build • Plugins parameters • Metadata • Example pipelines • RTSP Server • Related • License


Key Features

GStreamer plugin package for ZED Cameras. The package is composed of several plugins:

  • zedsrc: acquires camera color image and depth map and pushes them in a GStreamer pipeline.
  • zedmeta: GStreamer library to define and handle the ZED metadata (Positional Tracking data, Sensors data, Detected Object data, Detected Skeletons data).
  • zeddemux: receives a composite zedsrc stream (color left + color right data or color left + depth map + metadata), processes the eventual depth data and pushes them in two separated new streams named src_left and src_aux. A third source pad is created for metadata to be externally processed.
  • zeddatamux: receive a video stream compatible with ZED caps and a ZED Data Stream generated by the zeddemux and adds metadata to the video stream. This is useful if metadata are removed by a filter that does not automatically propagate metadata
  • zeddatacsvsink: example sink plugin that receives ZED metadata, extracts the Positional Tracking and the Sensors Data and save them in a CSV file.
  • zedodoverlay: example transform filter plugin that receives ZED combined stream with metadata, extracts Object Detection information and draws the overlays on the oncoming filter
  • RTSP Server: application for Linux that instantiates an RTSP server from a text launch pipeline "gst-launch" like.

Build

Prerequisites

Windows installation

  • Install the latest ZED SDK v3.5.x from the official download page [Optional to compile the zedsrc plugin to acquire data from a ZED camera device]

  • Install Git or download a ZIP archive

  • Install CMake

  • Install a GStreamer distribution (both runtime and development installers).

  • The installer should set the installation path via the GSTREAMER_1_0_ROOT_X86_64 environment variable.

  • Add the path %GSTREAMER_1_0_ROOT_X86_64%\bin to the system variable PATH

  • Run the following commands from a terminal or command prompt, assuming CMake and Git are in your PATH.

    git clone https://github.com/stereolabs/zed-gstreamer.git
cd zed-gstreamer
mkdir build
cd build
cmake -G "Visual Studio 16 2019" ..
cmake --build . --target INSTALL --config Release

Linux installation

Install prerequisites

  • Install the latest ZED SDK v3.5.x from the official download page

  • Update list of apt available packages

    $ sudo apt update

  • Install GCC compiler and build tools

    $ sudo apt install build-essential

  • Install CMake build system

    $ sudo apt install cmake

  • Install GStreamer, the development packages and useful tools:

    $ sudo apt install libgstreamer1.0-0 gstreamer1.0-plugins-base gstreamer1.0-plugins-good gstreamer1.0-plugins-bad gstreamer1.0-plugins-ugly gstreamer1.0-libav libgstrtspserver-1.0-0 gstreamer1.0-doc gstreamer1.0-tools gstreamer1.0-x gstreamer1.0-alsa gstreamer1.0-gl gstreamer1.0-gtk3 gstreamer1.0-qt5 gstreamer1.0-pulseaudio libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libgstrtspserver-1.0-dev

  • [Optional] Install OpenCV to build the zedodverlay filter

    $ sudo apt install libopencv-dev libopencv-contrib-dev

Clone the repository

$ git clone https://github.com/stereolabs/zed-gstreamer.git
$ cd zed-gstreamer

Build

$ mkdir build
$ cd build
$ cmake -DCMAKE_BUILD_TYPE=Release ..
$ make # Note: do not use the `-j` flag because parallel build is not supported
$ sudo make install

Installation test

  • Check ZED Video Source Plugin installation inspecting its properties:

    gst-inspect-1.0 zedsrc

  • Check ZED Video Demuxer installation inspecting its properties:

    gst-inspect-1.0 zeddemux

  • Check ZED Data Mux Plugin installation inspecting its properties:

    gst-inspect-1.0 zeddatamux

  • Check ZED CSV Sink Plugin installation inspecting its properties:

    gst-inspect-1.0 zeddatacsvsink

  • Check ZED Object Detection Overlay Plugin installation inspecting its properties:

    gst-inspect-1.0 zedodoverlay

Plugins parameters

ZED Video Source Plugin parameters

Most of the parameters follow the same name as the C++ API. Except that _ is replaced by - to follow gstreamer common formatting.

  • camera-resolution: stream resolution - {VGA (3), HD270 (2), HD1080 (1), HD2K (0)}
  • camera-fps: stream framerate - {15, 30, 60, 100}
  • stream-type: type of video stream - {Left image (0), Right image (1), Stereo couple (2), 16 bit depth (3), Left+Depth (4)}
  • sdk-verbose: SDK verbose mode - {TRUE, FALSE}
  • camera-image-flip: Use the camera in forced flip/no flip or automatic mode - {No Flip (0), Flip (1), Auto (2)}
  • camera-id: Select camera from cameraID - [0, 256]
  • camera-sn: Select camera from camera serial number
  • svo-file-path: SVO file path for SVO input
  • input-stream-ip: Specify IP adress when using streaming input
  • input-stream-port: Specify port when using streaming input
  • depth-minimum-distance: Minimum depth value
  • depth-maximum-distance: Maximum depth value
  • depth-mode: Depth Mode - {NONE (0), PERFORMANCE (1), QUALITY (2), ULTRA (3)}
  • coordinate-system: 3D Coordinate System - {Image (0) - Left handed, Y up (1) - Right handed, Y up (2) - Right handed, Z up (3) - Left handed, Z up (4) - Right handed, Z up, X fwd (5)}
  • camera-disable-self-calib: Disable the self calibration processing when the camera is opened - {TRUE, FALSE}
  • depth-stabilization: Enable depth stabilization - {TRUE, FALSE}
  • con 8000 fidence-threshold: Specify the Depth Confidence Threshold - [0,100]
  • texture-confidence-threshold: Specify the Texture Confidence Threshold - [0,100]
  • measure3D-reference-frame : Specify the 3D Reference Frame - {WORLD (0), CAMERA (1)}
  • sensing-mode: Specify the Depth Sensing Mode - {STANDARD (0), FILL (1)}
  • enable-positional-tracking: Enable positional tracking - {TRUE, FALSE}
  • set-as-static: Set to TRUE if the camera is static - {TRUE, FALSE}
  • area-file-path: Area localization file that describes the surroundings, saved from a previous tracking session
  • enable-area-memory: This mode enables the camera to remember its surroundings. This helps correct positional tracking drift, and can be helpful for positioning different cameras relative to one other in space - {TRUE, FALSE}
  • enable-imu-fusion: This setting allows you to enable or disable IMU fusion. When set to false, only the optical odometry will be used - {TRUE, FALSE}
  • enable-pose-smoothing: This mode enables smooth pose correction for small drift correction - {TRUE, FALSE}
  • set-floor-as-origin: This mode initializes the tracking to be aligned with the floor plane to better position the camera in space.
  • initial-world-transform-x: X position of the camera in the world frame when the camera is started.
  • initial-world-transform-y: Y position of the camera in the world frame when the camera is started.
  • initial-world-transform-z: Z position of the camera in the world frame when the camera is started.
  • initial-world-transform-roll: Roll orientation of the camera in the world frame when the camera is started.
  • initial-world-transform-pitch: Pitch orientation position of the camera in the world frame when the camera is started.
  • initial-world-transform-yaw: Yaw orientation of the camera in the world frame when the camera is started.
  • od-enabled: Enable Object Detection - {TRUE, FALSE}
  • od-image-sync: Set to TRUE to enable Object Detection frame synchronization - {TRUE, FALSE}
  • od-enable-tracking: Set to TRUE to enable tracking for the detected objects - {TRUE, FALSE}
  • od-detection-model: Object Detection Model - {(0): Object Detection Multi class, (1): Object Detection Multi class ACCURATE, (2): Skeleton tracking FAST, (3): Skeleton tracking ACCURATE, (4): Object Detection Multi class MEDIUM, (5): Skeleton tracking MEDIUM}
  • od-confidence: Minimum Detection Confidence - {0,100}
  • od-max-range: Maximum Detection Range - [-1,20000]
  • od-body-fitting: Set to TRUE to enable body fitting for skeleton tracking - {TRUE, FALSE}
  • brightness: Image brightness - {0,8}
  • contrast: Image contrast - {0,8}
  • hue: Image hue - {0,11}
  • saturation: Image saturation - {0,8}
  • sharpness: Image sharpness - {0,8}
  • gamma: Image gamma - {1,9}
  • gain: Camera gain - {0,100}
  • exposure: Camera exposure - {0,100}
  • aec-agc: Automatic camera gain and exposure - {TRUE, FALSE}
  • aec-agc-roi-x: Auto gain/exposure ROI top left 'X' coordinate (-1 to not set ROI) - {-1,2208}
  • aec-agc-roi-y: Auto gain/exposure ROI top left 'Y' coordinate (-1 to not set ROI) - {-1,1242}
  • aec-agc-roi-w: Auto gain/exposure ROI width (-1 to not set ROI) - {-1,2208}
  • aec-agc-roi-h: Auto gain/exposure ROI height (-1 to not set ROI) - {-1,1242}
  • aec-agc-roi-side: Auto gain/exposure ROI side - {LEFT (0), RIGHT (1), BOTH (2)}
  • whitebalance-temperature: Image white balance temperature - {2800,6500}
  • whitebalance-auto: Image automatic white balance - {TRUE, FALSE}
  • led-status: Camera LED on/off - {TRUE, FALSE}

ZED Video Demuxer Plugin parameters

  • is-depth: indicates if the bottom stream of a composite stream-type of the ZED Video Source Plugin is a color image (Right image) or a depth map.
  • stream-data: Enable binary data streaming on src_data pad - {TRUE, FALSE}

ZED Data CSV sink Plugin parameters

  • location: Location of the CSV file to write
  • append: Append data to an already existing CSV file

Metadata

The zedsrc plugin add metadata to the video stream containing information about the original frame size, the camera position and orientatio, the sensors data and the object and skeleton detected by the Object Detection module. The zeddatacsvsink and zedodoverlay elements demonstrate how to handle, respectively, the sensors data and the detected object data. The GstZedSrcMeta structure is provided to handle the zedmeta metadata and it is available in the gstzedmeta library.

GstZedSrcMeta structure

The GstZedSrcMeta is subdivided in four sub-structures:

  • ZedInfo: info about camera model, stream type and original stream size
  • ZedPose: position and orientation of the camera if positional tracking is enabled
  • ZedSensors: sensors data (only ZED-Mini and ZED2)
  • ZedObjectData: detected object information (only ZED2)

More details about the sub-structures are available in the gstzedmeta.h file

Pipeline examples

Local RGB stream + RGB rendering

    gst-launch-1.0 zedsrc ! queue ! autovideoconvert ! queue ! fpsdisplaysink

Local 16 bit Depth stream + Depth rendering

    gst-launch-1.0 zedsrc stream-type=3 ! queue ! autovideoconvert ! queue ! fpsdisplaysink

Local Left/Right stream + demux + double RGB rendering

    gst-launch-1.0 \
    zedsrc stream-type=2 ! queue ! \
    zeddemux is-depth=false name=demux \
    demux.src_left ! queue ! autovideoconvert ! fpsdisplaysink \
    demux.src_aux ! queue ! autovideoconvert ! fpsdisplaysink

Local Left/Depth stream + demux + double streams rendering

    gst-launch-1.0 \
    zedsrc stream-type=4 ! queue ! \
    zeddemux name=demux \
    demux.src_left ! queue ! autovideoconvert ! fpsdisplaysink \
    demux.src_aux ! queue ! autovideoconvert ! fpsdisplaysink

Local Left/Depth stream + demux + double streams rendering + data saving on CSV file

    gst-launch-1.0 \
    zedsrc stream-type=4 ! \
    zeddemux stream-data=TRUE name=demux \
    demux.src_left ! queue ! autovideoconvert ! fpsdisplaysink \
    demux.src_aux ! queue ! autovideoconvert ! fpsdisplaysink \
    demux.src_data ! queue ! zeddatacsvsink location="${HOME}/test_csv.csv" append=FALSE

Local Left/Right stream + Multiclass Object Detection result displaying

    gst-launch-1.0 \
    zedsrc stream-type=0 od-enabled=true od-detection-model=0 camera-resolution=2 camera-fps=30 ! queue ! \
    zedodoverlay ! queue ! \
    autovideoconvert ! fpsdisplaysink

Local Left/Right stream + Fast Skeleton Tracking result displaying

    gst-launch-1.0 \
    zedsrc stream-type=2 od-enabled=true od-detection-model=1 camera-resolution=0 camera-fps=15 ! queue ! \
    zedodoverlay ! queue ! \
    autovideoconvert ! fpsdisplaysink

Local Left RGB stream + Accurate Skeleton Tracking result displaying

    gst-launch-1.0 \
    zedsrc stream-type=0 od-enabled=true od-detection-model=2 camera-resolution=0 camera-fps=15  ! queue ! \
    zedodoverlay ! queue ! \
    autovideoconvert ! fpsdisplaysink

Local Left/Depth stream + Fast Skeleton Tracking result displaying + demux + Skeleton Tracking result displaying + Depth displaying with FPS

    gst-launch-1.0 \
    zedsrc stream-type=4 camera-resolution=2 camera-fps=30 od-enabled=true od-detection-model=1 ! \
    zeddemux name=demux \
    demux.src_left ! queue ! zedodoverlay ! queue ! autovideoconvert ! fpsdisplaysink \
    demux.src_aux ! queue ! autovideoconvert ! fpsdisplaysink

Local Left/Depth stream + Fast Skeleton Tracking result displaying + demux + rescaling + remux + Skeleton Tracking result displaying + Depth displaying with FPS

    gst-launch-1.0 \
    zeddatamux name=mux \
    zedsrc stream-type=4 camera-resolution=0 camera-fps=15 od-enabled=true od-detection-model=1 ! \
    zeddemux stream-data=true is-depth=true name=demux \
    demux.src_aux ! queue ! autovideoconvert ! videoscale ! video/x-raw,width=672,height=376 ! queue ! fpsdisplaysink \
    demux.src_data ! mux.sink_data \
    demux.src_left ! queue ! videoscale ! video/x-raw,width=672,height=376 ! mux.sink_video \
    mux.src ! queue ! zedodoverlay ! queue ! \
    autovideoconvert ! fpsdisplaysink

RTSP Server

< 73CD /a>

Available only for Linux

An application to start an RTSP server from a text pipeline (using the same sintax of the CLI command gst-launch-1.0) is provided.

Usage:

   gst-zed-rtsp-launch [OPTION?] PIPELINE-DESCRIPTION

Help Options:

  • -h, --help -> Show help options.
  • --help-all -> Show all help options.
  • --help-gst -> Show GStreamer Options.

Application Options:

  • -p, --port=PORT -> Port to listen on (default: 8554).
  • -a, --address=HOST -> Host address (default: 127.0.0.1).

Example:

   gst-zed-rtsp-launch zedsrc ! videoconvert ! 'video/x-raw, format=(string)I420' ! x264enc ! rtph264pay pt=96 name=pay0

It is mandatory to define at least one payload named pay0; it is possible to define multiple payloads using an increasing index (i.e. pay1, pay2, ...).

Ready-To-Use scripts

Ready to use scripts are available in the scripts/ folder for windows and linux.

  • local-od-fps_overlay : Left and Depth image rendering with object detection (FAST HUMAN BODY TRACKING) data (overlay).

  • local-rgb-depth-sens-csv : Left and Depth image rendering and sensors data saved in csv file.

  • local-rgb_left_depth-fps_rendering : Left and Depth image rendering.

  • local-rgb_left_right-fps_rendering : Left and Right image rendering.

  • local-rgb-od_multi-overlay : Left image rendering with object detection on overlay (MULTI_CLASS)

  • local-rgb-rescale-od-overlay : Left and Depth image rendering with object detection with rescaling filter

  • local-rgb-skel_accurate-overlay : Left image rendering with human body pose ACCURATE overlay

  • local-rgb-skel_fast-overlay : Left/Right in top/bottom image rendering with human body pose FAST overlay

  • [Linux only] udp and rtsp sender/receiver.

Related

License

This library is licensed under the LGPL License.

Support

If you need assistance go to our Community site at https://community.stereolabs.com/

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GStreamer source plugin for ZED Cameras

www.stereolabs.com/docs/gstreamer/

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