No Video Capture Device Error rs2_create_device

[yeric1789]

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Required Info
Camera Model	{ D435 }
Firmware Version	(Open RealSense Viewer --> 2.53.1)
Operating System & Version	Linux (Ubuntu 22.04 LTS)
Kernel Version (Linux Only)	(5.15.0-56-generic)
Platform	PC (x86 CPU)
SDK Version	{ 2.53.1}
Language	{C/C++ }
Segment	{others }

Issue Description

I have been attempting to install on a new Ubuntu distro 22.04 LTS, however when running my program which previously worked on Ubuntu 20.04 I find the following error being thrown:

RealSense error calling rs2_create_device(info_list:0x555e5b7a8c00, index:1):
    /dev/video0 is no video capture device Last Error: Invalid argument

When I go to list my devices out for my computer I see the following and indeed the Depth camera does not correspond with /dev/video0

$: v4l2-ctl --list-devices
ipu3-imgu (PCI:0000:00:05.0):
	/dev/video0
	/dev/video3
	/dev/video4
	/dev/video5
	/dev/video6
	/dev/video7
	/dev/video8
	/dev/video10
	/dev/video12
	/dev/video13
	/dev/media1

Intel IPU3 CIO2 (PCI:0000:00:14.3):
	/dev/video1
	/dev/video2
	/dev/video9
	/dev/video11
	/dev/media0

Intel(R) RealSense(TM) Depth Ca (usb-0000:00:14.0-1):
	/dev/video14
	/dev/video15
	/dev/video16
	/dev/video17
	/dev/video18
	/dev/video19
	/dev/media2
	/dev/media3

I have tested out the realsense-viewer and recorder which seems to work fine. I only have one device connected. I have also checked my code and found that the problem starts when I query for the devices. specifically looping through any connected devices:

for (rs2::device &&dev : ctx.query_devices()){
...

I have seen a similar issue from here #10072. I have checked for memory leaks which don't seem to present. I have seen that they used docker (which currently I am not using). Is there any way to get this fixed short of a custom build? Thanks.

[MartyG-RealSense]

Hi @yeric1789 If you are only using one camera and wish to access the depth stream, an alternative to looping through all connected devices may be to query for the first depth sensor that can be detected. For example in C++:

auto sensor = selection.get_device().first<rs2::depth_sensor>();

One of the best C++ references for using query_devices for querying the presence of all attached cameras rather than a specific sensor is #2219

[yeric1789]

OK thanks that was able to fix it.

[MartyG-RealSense]

That's great to hear, @yeric1789 - thanks very much for the update!