How to install Aravis to be Used with Python

Community
1

Hello,
I am a beginner to linux so sorry for not understanding some of the terminology but i am having trouble installing Aravis onto my raspberry pi4 with DebianOS. From the limited resources i could find i have followed many tutorials to no avail including this one(Using GigE Cameras with <br> Aravis | OpenCV | Gstreamer [<span class="caps">UPDATED</span>] - BitsMakeMeCrazy <br> Kushal Vyas's Blog) Using meson i think i have successfully ‘Built’ Aravis but now i think i am having trouble with having python “See” the Aravis library if that makes sence when i try to make a python script with

import gi
gi.require_version ('Aravis', '0.8')
from gi.repository import Aravis

It stops on the second line with,
raise ValueError(‘Namespace %s not avaliable’ % namespace )
ValueError: Namespace Aravis not avaliable

I would appreciate the help as i think aravis is my solution to accessing a GigE camera on a raspberry pi. Thank you for your response.

2

Hi,

Depending on where you have installed Aravis (/usr/local by default), you may have to set the GI_TYPELIB_PATH environment variable, and may be LD_LIBRARY_PATH.

3

I was using Aravis at RPi3, no problems. I’d suggest you use the packaged version of Aravis; you will need the gir1.2-aravis-0.8 package for Python. The you should not need any of GI_TYPELIB_PATH or LD_LIBRARY_PATH since the packages put files in to standard locations.

Did you not just forget to install, after building?

4

So i download that package you linked and just have it in same directory as my .py file? Then i should be able to just straight “import Aravis” or through gi like in my original post.

5

Install the package via apt like other programs (see RPi OS APT), so it will be something like sudo apt install gir1.2-aravis-0.8 in the terminal.

6

And then it will allow me to just “import Aravis” in a python file? Thanks for your patience ill give it a try tomorrow.

7

Then you do like you originally wrote

import gi
gi.require_version ('Aravis', '0.8')
from gi.repository import Aravis

See e.g. here for the same (older Aravis version).

8

Now i can import with no errors, Now how would i be able to get frames from my Gige camera to be used with opencv for image processing. All inm python btw thanks for your help

9

Look e.g. here for an example (pup_buffer, get_data, then conversion to np.array — opencv in python uses np.array for images).