ImportError: cannot import name Aravis

[sur83]

Dear all;
Thank you for share your work.
I have Aravis installed and working (I downloaded it from https://github.com/AravisProject/aravis ). I am able to see the streaming of my camera with the viewer.

When trying to compile python-aravis it raise this error:

ImportError: cannot import name Aravis

The error come from the 9th line in "aravis.py" which says:
from gi.repository import Aravis

I am totally lost. In internet I have found (https://github.com/ssafarik/aravis/blob/master/tests/python/arv-camera-test.py):
" If you have installed aravis in a non standard location, you may need
to make GI_TYPELIB_PATH point to the correct location. For example:
export GI_TYPELIB_PATH=$GI_TYPELIB_PATH:/opt/bin/lib/girepositry-1.0/
You may also have to give the path to libaravis.so, using LD_PRELOAD or
LD_LIBRARY_PATH. "

However, I made an standard installation of aravis without apparent problems. Also, I am pretty sure I made the installation with Introspection files writing:

./autogen.sh --enable-viewer --enable-gst-plugin --enable-introspection=yes
make
make install

In this page, you said a solution to this http://www.freelists.org/post/aravis/Aravis-Python-Support,1
I implemented the idea by:

sudo nano /etc/profile
and adding these two lines to the end of the file
export GI_TYPELIB_PATH=$GI_TYPELIB_PATH:/home/username/aravis/src
export LD_LIBRARY_PATH=/home/username/aravis/src/.libs
(where username is my username)
and afterthat, running:
source /etc/profile

However nothing works
Please, could you spread some light about this problem?

[oroulet]

This means that the GI bindings for aravis are not installed. Look at the
readme in python aravis. I think I wrote how to compile aravis with the
right options

On Thu, Sep 15, 2016, 17:59 sur83 notifications@github.com wrote:

Dear all;
Thank you for share your work.
I have Aravis installed and working (I downloaded it from
https://github.com/AravisProject/aravis ). I am able to see the streaming
of my camera with the viewer.

When trying to compile python-aravis it raise this error:
ImportError: cannot import name Aravis

The error come from the 9th line in "aravis.py" which says:
from gi.repository import Aravis

I am totally lost. In internet I have found (
https://github.com/ssafarik/aravis/blob/master/tests/python/arv-camera-test.py
):
If you have installed aravis in a non standard location, you may need to
make GI_TYPELIB_PATH point to the correct location. For example: export
GI_TYPELIB_PATH=$GI_TYPELIB_PATH:/opt/bin/lib/girepositry-1.0/ You may
also have to give the path to libaravis.so, using LD_PRELOAD or
LD_LIBRARY_PATH.

However, I made an standard installation of aravis.
Please, could you spread some light about this problem?

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[sur83]

Dear oroulet;
the readme file in python aravis says:
"Rmq: Aravis needs to be compiled with intropsection support.
It requires at least libgirepository1.0-dev and gobject-introspection packges on ubuntu"

I have previously installed the two packages in ubuntu:

s@s-VirtualBox:~/aravis/python-aravis-master$ sudo apt-get install gobject-introspection
Reading package lists... Done
Building dependency tree       
Reading state information... Done
gobject-introspection is already the newest version (1.46.0-3ubuntu1).
The following package was automatically installed and is no longer required:
  linux-image-extra-4.4.0-34-generic
Use 'sudo apt autoremove' to remove it.
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.

s@s-VirtualBox:~/aravis/python-aravis-master$ sudo apt-get upgrade libgirepository1.0-dev
Reading package lists... Done
Building dependency tree       
Reading state information... Done
libgirepository1.0-dev is already the newest version (1.46.0-3ubuntu1).
Calculating upgrade... Done
The following package was automatically installed and is no longer required:
  linux-image-extra-4.4.0-34-generic
Use 'sudo apt autoremove' to remove it.
The following packages have been kept back:
  ubuntu-core-launcher
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.

After that, I installed aravis with:

git clone https://github.com/sightmachine/aravis.git
cd aravis
./autogen.sh
./configure --enable-viewer --enable-gst-plugin --enable-introspection=yes
make    (1 warning:    arvheartbeattest.c:141:6: warning: implicit declaration of function ‘g_printf’       [-Wimplicit-function-declaration]
            (1 error: arvbuffer.c:121: Error: Aravis: identifier not found on the first line:
 * arv_buffer_data address:)

sudo make install           (1 warning: libtool: warning: relinking 'libgstaravis-0.4.la')

and after that, the test work fine:
s@s-VirtualBox:~/aravis/tests/python$ ./launch arv-camera-test.py

arv-camera-test.py:35: PyGIWarning: Aravis was imported without specifying a version first. Use gi.require_version('Aravis', '0.4') before import to ensure that the right version gets loaded.
  from gi.repository import Aravis
Camera vendor : PHOTONIS USA DIGITAL IMAGING
Camera model  : NOCTURN GV MONOCHROME
Camera id     : 1405-001016
ROI           : 128x128 at 0,0
Payload       : 16384
Pixel format  : Mono8
Start acquisition
Acquisition
<Aravis.Buffer object at 0x7f5c4f76e870 (ArvBuffer at 0x1c70ed0)>
<Aravis.Buffer object at 0x7f5c4f76e8c0 (ArvBuffer at 0x1c70f40)>
<Aravis.Buffer object at 0x7f5c4f76e870 (ArvBuffer at 0x1c71040)>
<Aravis.Buffer object at 0x7f5c4f76e8c0 (ArvBuffer at 0x1c710b0)>
<Aravis.Buffer object at 0x7f5c4f76e870 (ArvBuffer at 0x1c71120)>
<Aravis.Buffer object at 0x7f5c4f76e8c0 (ArvBuffer at 0x1c71190)>
<Aravis.Buffer object at 0x7f5c4f76e870 (ArvBuffer at 0x1c71200)>
<Aravis.Buffer object at 0x7f5c4f76e8c0 (ArvBuffer at 0x1c71270)>
<Aravis.Buffer object at 0x7f5c4f76e870 (ArvBuffer at 0x1c712e0)>
<Aravis.Buffer object at 0x7f5c4f76e8c0 (ArvBuffer at 0x1c71350)>
<Aravis.Buffer object at 0x7f5c4f76e870 (ArvBuffer at 0x1c70ed0)>
<Aravis.Buffer object at 0x7f5c4f76e8c0 (ArvBuffer at 0x1c70f40)>
<Aravis.Buffer object at 0x7f5c4f76e870 (ArvBuffer at 0x1c71040)>
<Aravis.Buffer object at 0x7f5c4f76e8c0 (ArvBuffer at 0x1c710b0)>
<Aravis.Buffer object at 0x7f5c4f76e870 (ArvBuffer at 0x1c71120)>
<Aravis.Buffer object at 0x7f5c4f76e8c0 (ArvBuffer at 0x1c71190)>
<Aravis.Buffer object at 0x7f5c4f76e870 (ArvBuffer at 0x1c71200)>
<Aravis.Buffer object at 0x7f5c4f76e8c0 (ArvBuffer at 0x1c71270)>
<Aravis.Buffer object at 0x7f5c4f76e870 (ArvBuffer at 0x1c712e0)>
<Aravis.Buffer object at 0x7f5c4f76e8c0 (ArvBuffer at 0x1c71350)>
Stop acquisition

I downloaded python aravis from https://github.com/SintefRaufossManufacturing/python-aravis and I installed it with "sudo python setup.py install". Hiowever, the same error raised:
s@s-VirtualBox:~/aravis/python-aravis-master$ sudo python setup.py installTraceback (most recent call last):

 File "setup.py", line 9, in <module>
    import make_deb
  File "/home/s/aravis/python-aravis-master/make_deb.py", line 9, in <module>
    import aravis
  File "/home/s/aravis/python-aravis-master/aravis.py", line 9, in <module>
    from gi.repository import Aravis
ImportError: cannot import name Aravis

Any idea of what am I doing wrong?

[IamSierraCharlie]

I know that this is an old thread, but guaranteed someone else will run into the issue.
The problem is around your lib directory
When installing without specifying directories, the default install for the "Aravis-0.6.typelib" is something like "/usr/local/lib/girepository-1.0" because the default lib directory is /usr/local/lib.
That typelib appears to be responsible for aravis being detected by python and if in the wrong place, will throw an error as you've seen above.

All good if you are using the default install of python.
In myh case, I am using anaconda. After pulling my hair out for most of the day, then faking it with some dodgy linkages, I found the best way to do the install and make it work was to specify the lib directory.
In my case (for example)
./configure --enable-usb --enable-viewer --enable-gst-plugin --enable-fast-heartbeat --enable-introspection=yes --enable-gtk-doc --enable-zlib-pc --libdir=/home/yourhomedir/anaconda/envs/fruit/lib

I am still learning, but as soon as I build aravis specifying the lib dir, it worked.

I hope that this is useful for someone
Great project guys - keep up the great work.
Steve

[IamSierraCharlie]

Just an update on this one.
Whilst the above works, it may cause issues with gstreamer not being recognised as installed on your system. Another way to get around the issue is to set up a link between the location of Aravis-0.6.typelib file and where is should be.

The typical install location for that file is
/usr/local/lib/girepository-1.0/Aravis-0.6.typelib in a Ubuntu install
For example:
ln -s /usr/local/lib/girepository-1.0/Aravis-0.6.typelib /path/to/where/your/python/install/needs/the/file/to/be

[tobeycarman]

@IamSierraCharlie, this was very helpful. It took me quite a while to figure out the /path/to/where/your/python/install/needs/the/file/to/be, but once I found that location, creating the link worked. I found the path where my Python was looking for Aravis-0.6.typlib by using find and looking for another typelib file that I knew to work:

$ find / -name "*Gst-1.0.typelib"
/usr/lib/girepository-1.0/Gst-1.0.typelib

I am not entirely sure how the Gst-1.0.typelib worked after my previous install steps and Aravis-0.6.typelib did not work without making this symlink.

[pengy8]

Hi, I'm having the same issue running Ok with ./launch arv-camera-test.py:

yc@yc-ideacentre-Y700-34ISH:~/Camera/aravis/tests/python$ ./launch arv-camera-test.py
arv-camera-test.py:35: PyGIWarning: Aravis was imported without specifying a version first. Use gi.require_version('Aravis', '0.4') before import to ensure that the right version gets loaded.
  from gi.repository import Aravis
Camera vendor : Teledyne DALSA
Camera model  : Nano-C2450
Camera id     : S1138369
ROI           : 272x128 at 0,0
Payload       : 0
Pixel format  : BayerRG8
Start acquisition
Acquisition
<Aravis.Buffer object at 0x7f28133ab280 (ArvBuffer at 0x15dd2d0)>
<Aravis.Buffer object at 0x7f28133ab2d0 (ArvBuffer at 0x15dd340)>
<Aravis.Buffer object at 0x7f28133ab280 (ArvBuffer at 0x15dd440)>
<Aravis.Buffer object at 0x7f28133ab2d0 (ArvBuffer at 0x15dd4b0)>
<Aravis.Buffer object at 0x7f28133ab280 (ArvBuffer at 0x15dd520)>
<Aravis.Buffer object at 0x7f28133ab2d0 (ArvBuffer at 0x15dd590)>
<Aravis.Buffer object at 0x7f28133ab280 (ArvBuffer at 0x15dd600)>
<Aravis.Buffer object at 0x7f28133ab2d0 (ArvBuffer at 0x15dd670)>
<Aravis.Buffer object at 0x7f28133ab280 (ArvBuffer at 0x15dd6e0)>
<Aravis.Buffer object at 0x7f28133ab2d0 (ArvBuffer at 0x15dd750)>
<Aravis.Buffer object at 0x7f28133ab280 (ArvBuffer at 0x15dd2d0)>
<Aravis.Buffer object at 0x7f28133ab2d0 (ArvBuffer at 0x15dd340)>
<Aravis.Buffer object at 0x7f28133ab280 (ArvBuffer at 0x15dd440)>
<Aravis.Buffer object at 0x7f28133ab2d0 (ArvBuffer at 0x15dd4b0)>
<Aravis.Buffer object at 0x7f28133ab280 (ArvBuffer at 0x15dd520)>
<Aravis.Buffer object at 0x7f28133ab2d0 (ArvBuffer at 0x15dd590)>
<Aravis.Buffer object at 0x7f28133ab280 (ArvBuffer at 0x15dd600)>
<Aravis.Buffer object at 0x7f28133ab2d0 (ArvBuffer at 0x15dd670)>
<Aravis.Buffer object at 0x7f28133ab280 (ArvBuffer at 0x15dd6e0)>
<Aravis.Buffer object at 0x7f28133ab2d0 (ArvBuffer at 0x15dd750)>
Stop acquisition

I've also linked the library (since it's already linked):

yc@yc-ideacentre-Y700-34ISH:~/Camera/python-aravis-master$ sudo find / -name "*Gst-1.0.typelib"
find: ‘/run/user/1000/gvfs’: Permission denied
/usr/lib/girepository-1.0/Gst-1.0.typelib
yc@yc-ideacentre-Y700-34ISH:~/Camera/python-aravis-master$ ln -s /usr/local/lib/girepository-1.0/Aravis-0.6.typelib /usr/lib/girepository-1.0/
ln: failed to create symbolic link '/usr/lib/girepository-1.0/Aravis-0.6.typelib': File exists 

However, I still got the same error:

yc@yc-ideacentre-Y700-34ISH:~/Camera/python-aravis-master$ sudo python setup.py install
[sudo] password for yc: 
Traceback (most recent call last):
  File "setup.py", line 9, in <module>
    import make_deb
  File "/home/yc/Camera/python-aravis-master/make_deb.py", line 9, in <module>
    import aravis
  File "/home/yc/Camera/python-aravis-master/aravis.py", line 9, in <module>
    from gi.repository import Aravis
ImportError: cannot import name Aravis

This repo seems potential and useful to me, and just I'm being too silly to make it work.
Could anybody please advice?
Thank you very much.

[bobotus]

For Ubuntu 16.04.4 LTS Desktop the following was required to get the Aravis module working for python3.5. Hopefully this helps.

Configure with introspection:

./configure --enable-viewer --enable-gst-plugin --enable-introspection=yes
make
sudo make install

Locate .typelib location:

find / -name "*.typelib"

Create a symlink:

sudo ln -s /usr/local/lib/girepository-1.0/Aravis-0.6.typelib  /usr/local/lib/python3.5/dist-packages/

Install python-aravis from github repository (Optional):

sudo python3 setup.py install

[maxlem]

For me, in debian stretch, the symlink did not work. I used this instead
sudo ln -s /usr/local/lib/girepository-1.0/Aravis-0.6.typelib /usr/lib/i386-linux-gnu/girepository-1.0/