Pyrealsense2 installation problems on Jetson Nano

August 20, 2020 07:06
Edited

Hi everyone, I’m trying to install the Python wrapper on my Jetson Nano (Ubuntu 18.04), unsuccessfully. As indicated here (https://support.intelrealsense.com/hc/en-us/community/posts/360039885073-PyRealsense2-library-installation-error-in-Jetson-nano), I’ve been following the instructions given for ubuntu 16.04. The installation runs correctly but when trying to execute the examples given on the website, the terminal only returns that there is no realsense device connected. Same result when I try to execute rs-distance from the terminal or when I try to launch the viewer there is no device identified by the librealsense library. However the nano sees there is an intel device connected. ‏Installing the version from Jetson hacks alone of librealsense (without the Python Wrapper) is fine and the viewer sees the camera and display the images, but this doesn’t install the wanted wrapper. I know that it has already been done before, so I know there’s a way to do it, so if you have any suggestion, please let me know. Thank you, EA

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12 comments

MartyG

August 20, 2020 08:20
Hi Eitan Allal the link below details an installation method of librealsense and the Python wrapper together at the same time that worked for a Jetson Nano user.

https://github.com/IntelRealSense/librealsense/issues/6964#issuecomment-672059669
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Eitan Allal

August 23, 2020 08:11

Edited
Hi,
Thanks for your answer.
I‘ve been following the instructions from the link you sent me, but the screen freezes. I tried on another SD card (newly flashed) the screen freezes at the same step of the installation. Any idea ?
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MartyG

August 23, 2020 08:08
What step of the installation does it freeze at, please?
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Eitan Allal

August 23, 2020 08:12
Sorry, I was adding a picture of the screen, please see the previous comment.

I don't really know where it is exactly, at about 30% of the installation, maybe a bit less.
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MartyG

August 23, 2020 08:21

Edited
Have you got a swapfile set up on your Jetson? It provides "virtual memory" created from storage space on the SD card, and programs can use this virtual memory when the normal memory is used up.

https://www.jetsonhacks.com/2019/04/14/jetson-nano-use-more-memory/
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Eitan Allal

August 23, 2020 09:40
I've installed a swipefile and the make -j4 worked. Then when I execute make install, I've this :

Any idea ?
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MartyG

August 23, 2020 10:01
I have not seen that particular problem before. If you are installing librealsense on the SD card, I wonder if the card does not have enough storage space left available to copy the file, especially if a swapfile is set up (which uses up some of the card space) and the card is a 16 GB one (I use a 32 GB for my own Nano).
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Eitan Allal

August 23, 2020 10:05
The card is 64GB...
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MartyG

August 23, 2020 10:22

Edited
Another approach that has worked on Nano in at least one case is to build librealsense with the JetsonHacks instructions and then follow the advice in the link below to install the Python wrapper. Make sure to be in the build folder (librealsense > build) when running the CMake build instruction to build the Python wrapper.

https://support.intelrealsense.com/hc/en-us/community/posts/360039885073/comments/360010731894
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Eitan Allal

August 23, 2020 13:37
It’s complicated...
Maybe we can find a way to avoid having to use Python: is that possible to have a code in c++ just taking and saving pictures and then the Python code loads them?
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MartyG

August 23, 2020 14:20

Edited
If you just wanted to take a PNG image of a single frame with C++ then there is the save-to-disk example.

https://github.com/IntelRealSense/librealsense/tree/master/examples/save-to-disk

If you needed an image for each frame then you could record a bag format file, which is like a video recording containing camera data. You could record with the RealSense Viewer program, or with the record-playback C++ example program.

https://github.com/IntelRealSense/librealsense/tree/master/examples/record-playback

Once the bag is recorded, you can extract all its frames as a set of PNG files using the RealSense SDK's rs-convert tool.

https://github.com/IntelRealSense/librealsense/tree/master/tools/convert
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Eitan Allal

August 23, 2020 15:11
Okay, I’ll look in that direction and keep you updated in the next days. Thanks
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