Overlay an image on top of a GStreamer UDP stream

Robotics & Edge Computing Jetson Systems Jetson Nano
1

(Sorry I’ve edited my question so many times. )
Hi,

I tried search, but couldn’t find much help. I have a UDP stream running as follows:

gst-launch-1.0 v4l2src device=/dev/video0 io-mode=2 ! 'image/jpeg,width=1280,height=720,framerate=60/1' ! videorate ! 'image/jpeg,framerate=12/1' ! nvjpegdec ! 'video/x-raw' ! nvvidconv ! 'video/x-raw(memory:NVMM),width=640,height=480' ! nvv4l2h264enc maxperf-enable=1 control-rate=0 bitrate=400000 insert-sps-pps=true iframeinterval=10 ! h264parse ! rtph264pay pt=96 ! udpsink host=xx.xx.xx.xx port=8001 sync=false -e

I think the problem now is, is there anyway that by giving a signal, we can draw something/shape on gstreamer stream? like receiving the signal to draw, draw the shape, without signal, stream the raw frames…

Any suggestion would be appreciated!

3

Hi,
Not sure if it is possible in running gst-launch-1.0. In C code, you can add prob function in source pad of nvjpegdec and access the video buffers. Please look at:
https://gstreamer.freedesktop.org/documentation/additional/design/probes.html?gi-language=c