Nvblender segfaults

Please provide complete information as applicable to your setup.

• Hardware Platform (Jetson / GPU) Tesla T4
• DeepStream Version 6.0
• TensorRT Version
• NVIDIA GPU Driver Version (valid for GPU only) 470.63.01

I’m trying to use nvblender to overlay segmentation masks onto the original video passed into a TensorRT model. First of all, is this an appropriate use case?

Second of all, my program segfaults every time I pass video into it. The portion of the pipeline creating the problem is the nvblender:

                      queue ! nvsegvisual !
                     /                     \
... ! nvinfer ! tee !                       nvblender ! ...
                     \                     /
                      queue               !

If I only give the blender one video stream, it doesn’t crash. The problem is isolated to this portion of the pipeline, as I can recreate the problem on the command line:

GST_DEBUG=5 sudo gst-launch-1.0 videotestsrc ! tee name=t ! queue ! nvblender name=b t. ! queue ! b.sink_1
Setting pipeline to PAUSED ...
Pipeline is PREROLLED ...
Setting pipeline to PLAYING ...
New clock: GstSystemClock
Redistribute latency...
#0  0x00007f2aeddbbbb9 in __GI___poll (fds=0x5578e816ff90, nfds=2, timeout=-1)
#1  0x00007f2aee3036e9 in  () at /usr/lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f2aee303a82 in g_main_loop_run ()
#3  0x00007f2aee8679f3 in gst_bus_poll ()
#4  0x00005578e506abb3 in  ()
#5  0x00005578e5069cb7 in  ()
#6  0x00007f2aedcc8c87 in __libc_start_main (main=
#7  0x00005578e506a0da in  ()
Spinning.  Please run 'gdb gst-launch-1.0 8874' to continue debugging, Ctrl-C to quit, or Ctrl-\ to dump core.

If this isn’t how I’m supposed to add the segmentation mask onto the original video, how should I do that?

When I use gstreamer’s compositor in place of the nvblender, the gst-launch command works fine. However, I can’t simply use compositor because it requires me to leave the GPU before the encoding stage. Does nvblender require a fix, or is this actually not an intended use case?

nvblender is for internal use only. It is still under development. Please do not use it.

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