ArduCam Stereo cameras won't work in Python

[lennynpeter]

Hello,
I would like to use the ArduCam Stereo HAT with two IMX 477 for depth mapping. With the following gstreamer pipe I get images fro the camera when running the pipe directly from the command line:

gst-launch-1.0 nvarguscamerasrc sensor_id=0 ! 'video/x-raw(memory:NVMM),width=1920, height=1080, framerate=20/1, format=NV12' ! nvvidconv flip-method=0 ! 'video/x-raw,width=960, height=720' ! nvvidconv ! nvegltransform ! nveglglessink -e

If I use the sample Python program, I get the following error:

GST_ARGUS: Creating output stream
CONSUMER: Waiting until producer is connected...
GST_ARGUS: Available Sensor modes :
GST_ARGUS: 4056 x 3040 FR = 10.000000 fps Duration = 100000000 ; Analog Gain range min 1.000000, max 22.250000; Exposure Range min 13000, max 683709000;

GST_ARGUS: 2028 x 1520 FR = 40.000000 fps Duration = 25000000 ; Analog Gain range min 1.000000, max 22.250000; Exposure Range min 13000, max 683709000;

GST_ARGUS: 2028 x 1080 FR = 50.000000 fps Duration = 20000000 ; Analog Gain range min 1.000000, max 22.250000; Exposure Range min 13000, max 683709000;

ARGUS_ERROR: Error generated. /dvs/git/dirty/git-master_linux/multimedia/nvgstreamer/gst-nvarguscamera/gstnvarguscamerasrc.cpp, execute: 895 Frame Rate specified is greater than supported
GST_ARGUS: Running with following settings:
Camera index = 0
Camera mode = 0
Output Stream W = 4056 H = 3040
seconds to Run = 0
Frame Rate = 10.000000
GST_ARGUS: Setup Complete, Starting captures for 0 seconds
GST_ARGUS: Starting repeat capture requests.
CONSUMER: Producer has connected; continuing.
ARGUS_ERROR: Error generated. /dvs/git/dirty/git-master_linux/multimedia/nvgstreamer/gst-nvarguscamera/gstnvarguscamerasrc.cpp, execute: 1131 InvalidState.
GST_ARGUS: Cleaning up
[ WARN:0] global /home/nvidia/host/build_opencv/nv_opencv/modules/videoio/src/cap_gstreamer.cpp (1757) handleMessage OpenCV | GStreamer warning: Embedded video playback halted; module nvarguscamerasrc0 reported: Internal data stream error.
nvbuf_utils: dmabuf_fd -1 mapped entry NOT found
nvbuf_utils: Can not get HW buffer from FD... Exiting...
CONSUMER: ERROR OCCURRED
[ WARN:0] global /home/nvidia/host/build_opencv/nv_opencv/modules/videoio/src/cap_gstreamer.cpp (886) open OpenCV | GStreamer warning: unable to start pipeline
[ WARN:0] global /home/nvidia/host/build_opencv/nv_opencv/modules/videoio/src/cap_gstreamer.cpp (480) isPipelinePlaying OpenCV | GStreamer warning: GStreamer: pipeline have not been created
Traceback (most recent call last):
File "/home/peterl/Desktop/pyPro/test.py", line 135, in
camera = Camera()
File "/home/peterl/Desktop/pyPro/test.py", line 107, in init
self.open_camera()
File "/home/peterl/Desktop/pyPro/test.py", line 112, in open_camera
raise RuntimeError("Failed to open camera!")
RuntimeError: Failed to open camera!

I'm pretty new to gstreamer, so any help would be very much appreciated. Thanks in advance.