Gst_loopback THETA V

[SMI]

Hello again,

I recently purchased two THETA V cameras and I am trying to get them to stream using ./gst_loopback but I keep getting the following error messages “Internal data stream error” and “No streaming interface found for terminal 3” (see screenshots below).

keep in mind that the cameras stream just fine with ./gst_viewer on /dev/video0 (I edited the gst_viewer.c file to work with video0)

I’m trying this on both Linux Ubuntu and a NVIDIA Xavier but I get almost the same errors in both.

Does anyone have an idea what the problem could be?

Thank you

[craig]

Do you have docker installed? I uninstalled it on the Jetson I was using.

test with v4l2loopback

gst-launch-1.0 -v v4l2src ! videoconvert ! videoscale ! video/x-raw,width=1000,height=500  ! xvimagesink

suggest using gstthetauvc instead of v4l2loopback

You may want to use gstthetauvc instead of v4l2loopback.

Jetson with gstthetauvc

Live Streaming over USB on Ubuntu and Linux, NVIDIA Jetson

gstthetauvc on Jetson Nano make cd thetauvc/ craig@jetson:~/Documents/Development/gstthetauvc/thetauvc$ ls gstglutils.c gstthetatransform.h gstthetauvcsrc.h thetauvc.c gstglutils.h gstthetauvc.c Makefile thetauvc.h gstthetatransform.c gstthetauvcsrc.c shader.h craig@jetson:~/Documents/Development/gstthetauvc/thetauvc$ make mkdir ./obj cc -fPIC -g -Og -pthread -I/usr/local/include -I/usr/include/gstreamer-1.0 -I/usr/include/glib-2.0 -I/usr/lib/aarch64-linu…

gst-launch-1.0 thetauvcsrc mode=4K ! queue ! h264parse ! nvv4l2decoder ! queue ! nv3dsink sync=false

x86 with nvidia gpu and hardware acceleration

Live Streaming over USB on Ubuntu and Linux, NVIDIA Jetson

Maybe you are the same guy davzoltan on GitHub, right? This is the response from the developer As I don't have discrete GPU PC, I don't have any pipeline example using nvdec. But according to https://codetricity.github.io/theta-linux/optimization/#configuration-with-v4l2loopack-on-devvideo , I guess `thetauvcsrc ! queue ! h264parse ! nvdec ! gldownload ! queue ! videoconvert n-threads=0 ! video/x-raw,format=BGR ! queue ! appsink` may work. Of course, above example isn't optimal, so additional …

gst-launch-1.0 thetauvcsrc ! queue ! h264parse ! nvdec ! gldownload ! queue ! videoconvert n-threads=0 ! video/x-raw,format=BGR ! queue ! glimagesink

[SMI]

Thanks a lot. using gstthetauvc worked, I guess the problem was with the loopback.

I also wanted to ask if anyone tried streaming with two THETA V cameras simultaneously before? Is it possible with opencv (or even at all)?

I am currently investigating that but without any luck yet.

Thank you

[craig]

I have not tried two thetas on Linux, but I have seen the developer of gstthetauvc demo two theta cameras streaming simultaneously on a Jetson Xavier.

looking at the code for thetauvc.c, it seems like it should work with multiple cameras. However, I have not tried it.

Also, I can recall no success other than with the developer of the driver.