libnvds_mqtt_proto

A protocol library to get NVIDIA Deepstream detections output through MQTT.

This repo holds a few pieces of code taken from the web plus a tested NVDS pipeline configuration, saving precious time of lots of trial and error.

Installation

• Install MQTT broker sudo apt install mosquitto
• Install paho.mqtt.c & paho.mqtt.cpp with dependencies:
  • Run `mkdir build-deps'
  • sudo mqtt_install.sh for an auto-install
• Compile libnvds_mqtt_proto.cpp by running make.
  • This generates libnvds_mqtt_proto.so
  • Copy to the expected location: sudo cp libnvds_mqtt_proto.so /opt/nvidia/deepstream/deepstream/lib/

Usage

• Configure your pipeline's nvmsgbroker:
  • Link the protocol library proto-lib="libnvds_mqtt_proto.so"
  • Configure your connection string to your liking conn-str="127.0.0.1;9998[;NAME]"
  • Configure the publishing topic: topic="hello"
• Link the sample config file to nvmsgconv: config="msgconv_config.txt"
• Run Mosquitto to host the MQTT server
• Run your deepstream pipeline

Sample below:

gst-launch-1.0                                                                               \
    v4l2src device=/dev/video0                                                               \
        ! videoconvert ! 'video/x-raw,format=I420'                                           \
        ! queue leaky=2 max-size-buffers=100 max-size-time=0 max-size-bytes=1                \
        ! nvvideoconvert                                                                     \
        ! 'video/x-raw(memory:NVMM),format=(string)I420,width=640,height=480,framerate=30/1' \
        ! m.sink_0                                                                           \
    nvstreammux name=m batch-size=1 width=640 height=480 nvbuf-memory-type=0                 \
    ! nvvideoconvert                                                                         \
    ! nvinfer config-file-path="config_infer_primary.txt"                                    \
    ! tee name=teee                                                                          \
    teee.                                                                                    \
        ! nvmultistreamtiler width=640 height=480                                            \
        ! nvvideoconvert                                                                     \
        ! nvdsosd                                                                            \
        ! nveglglessink async=0 sync=0                                                       \
    teee.                                                                                    \
        ! queue leaky=1                                                                      \
        ! nvmsgconv msg2p-newapi=1                                                           \
            config="msgconv_config.txt"                                                      \
            payload-type=1                                                                   \
            frame-interval=1                                                                 \
        ! nvmsgbroker conn-str="127.0.0.1;9998"                                              \
            proto-lib="libnvds_mqtt_proto.so"                                                \
            topic="hello"                                                                    ;

Acknowledgements

• Paho install script taken from here
• Library main script taken from here