GStreamer Network Video Stream and Save to File

Robotics & Edge Computing Jetson & Embedded Systems Jetson Nano
1

I am trying to use the following project https://www.jetsonhacks.com/2014/10/16/gstreamer-xvimage/ as a template to use the Jetson Nano to stream two USB webcams (C920) to the screen. However, when I use the following code:

gst-launch-1.0 -vvv \
	tee name=splitter \
	v4l2src device=/dev/video0 do-timestamp=true ! image/jpeg, width=1280, height=720, framerate=30/1 \
   	! jpegparse ! jpegdec \
   	! $videoconvert ! videoscale ! xvimagesink sync=false splitter. \
	v4l2src device=/dev/video1 do-timestamp=true ! image/jpeg, width=1280, height=720, framerate=30/1 \
   	! jpegparse ! jpegdec \
   	! $videoconvert ! videoscale ! xvimagesink sync=false splitter.

I get an error:

WARNING: erroneous pipeline: unexpected reference "splitter" - ignoring

I can use the following code to view a single webcam for both video inputs no problem:

gst-launch-1.0 -v v4l2src device=/dev/video0 \
   	! image/jpeg, width=1920, height=1080, framerate=30/1 \
   	! jpegparse ! jpegdec \
   	! videoconvert ! videoscale \
   	! xvimagesink sync=false

I am wondering if it is a syntax issue I am having. Eventually, I would like to save one of these videos to a file and stream via RTSP. But I am having issues using the “tee” functionality of gstreamer.

Thank you!

2

Hi,
tee plugin is for single source and multiple sinks. Your case is multiple sources and single sink. You may use nvcompositor plugin. Please refer to
https://devtalk.nvidia.com/default/topic/1071764/jetson-nano/nvcompositor-appears-to-only-render-lowest-8-zorder-streams/post/5429939/#5429939

3

Thank you for the quick response. Can you please provide information on how to use the tee plugin correctly? For a similar application, I would like to have a single source with multiple sinks. I would like to take a single USB webcam input, save the video to a file, and stream the video via RTSP. The example below has the same error as my first post:

gst-launch-1.0 -vvv -e \
        mp4mux name=mux ! filesink location=file.mp4 \
        v4l2src device=/dev/video0 timestamp=true \
        ! video/x-h264, width=1920, height=1080, framerate=30/1
        ! tee name=tsplit \
        ! queue ! h264parse ! omxh264dec ! videoconvert ! videoscale \
        ! video/x-raw, width=1280, height=720 ! xvimagesink sync=false tsplit. \
        ! queue ! h264parse ! mux.video_0 tsplit. \
        ! queue ! h264parse ! mpegtsmux ! tcpserversink host=$IP_ADDRESS port=5000 \
        pulsesrc device=alsa_input.usb-046d_HD_Pro_Webcam_C920_A116B66F-02-C920.analog-stereo do-timestamp=true \
        ! audio/x-raw ! queue ! audioconvert ! voaacenc ! queue ! mux.audio_0

Thank you!

4

Hi,
Please refer to
https://devtalk.nvidia.com/default/topic/976743/jetson-tx1/get-rgb-frame-data-from-nvvidconv-gstreamer-1-0/post/5022878/#5022878
and
https://devtalk.nvidia.com/default/topic/1057681/jetson-tx1/logitech-c930e-on-jetson-tx1-very-slow-and-choppy-video/post/5363417/#5363417