tx1 gst test app: nvoverlaysink,why it can overlay my video from camera?

1.the video from /dev/video0 that capture video data by the camera displays by x windows
2. gst-launch-1.0 videotestsrc ! nvoverlaysink
the test app(nvoverlaysink ) starts ,then the video from nvoverlaysink overlay first steps’.


nvoverlaysink displays not by x windows?

any ideas?


Hi alex,
‘gst-launch-1.0 videotestsrc ! nvoverlaysink’ runs fine. What is the command not running well?


The command is ok,but why nvoverlaysink’s video is up on the video from the camera?

I want to know the reason.

nvoverlaysink is not using X11. It uses some library that can directly control the dc window.
For dc window, please refer to chapter 25 Display controller in TRM.