OpenViBE forum

Hello Fabio, I'm not sure if the electrode configuration is optimal for motor imagery. Do you have any other electrodes near C3 and C4? It'd be best if you could have some electrodes also around C3 and C4 for CSP to be able to build a Laplacian type center-surround configurations to better isolate t...

Hi, that box is unfortunately broken in the release version of OpenViBE. I recently fixed it, but we haven't made a new release. If its very important to you, you can try to compile the latest git master version where it should be ok.


Best,
Jussi

Hi, here's some pointers. If you think the issue is in your scenario, please see http://openvibe.inria.fr/tutorial-troubleshooting-openvibe-scenarios/ On the other hand, if you think it is a bug, please follow the instructions in http://openvibe.inria.fr/faq/#how-to-report-a-bug/ Personally I'm not ...

Hi, openvibe does not have premade classifiers for different mental states or conditions, as according to mainstream understanding, the signal processing (classifier) requires changes for different conditions as well (or to figure them out automatically -- hard). For example, the change of user, use...

Hi, its not super comfy, but what you can do is to have some external process launch designer multiple times with different configurations. For this you can use Matlab, Python, R or even a shell script if you're comfy with it. Basically, you should loop over your electrode configurations with a bloc...

In OV, signal is always implicitly epoched even if you're not aware of it: the data is always passed on from box to another in small matrix chunks. In OV, the 'epoch size' and 'chunk size' are the same thing, and mean the number of columns in small data matrices that are passed around. For example, ...

Hi, Epoching slices the signal in different ways (you can think of it as implementing a sliding window with different step sizes), whereas Windowing applies a coefficient mask on each signal chunk. Both names are due to historical reasons. If you have single channel signal chunk [x(1),...,x(k)] for ...

Hello, not at the moment, no. If you wish to integrate openvibe-based scenario playing (DSP) to your program, you could look at the scenario player code under the sdk/. This player doesn't have any GUI, so it should be more easy to understand than the designer code. Getting signal acquisition integr...

Hi, some boxes had to be dropped/replaced in the OpenViBE 2.x, and we don't currently have the resources to update the video. You can either try OpenViBE 1.3 or use other boxes. The following document lists the changes, http://openvibe.inria.fr/differences-between-1-x-and-2-x-series-of-openvibe/ You...

I'm often building it on Windows 10 myself so it should work. Some colleagues do as well. I'm not sure what could be the issue if the VS version etc are as they should be. On my computer the lib is present in several different places, e.g. under "Program Files (x86)", ./Microsoft SDKs/Windows/v7.1A/...

Hello Stanislav, unfortunately non-integer sampling rates are not currently supported. In this case it might be best to modify the LSL driver to drop an extra sample now and then to get to an integer rate. This is because if you want to mark your EEG with events in OpenViBE (e.g. for training classi...

Hi, sure, you just need to forward 'classifier processor' outputs to the NES emulator using some communication protocol of your choice (see the ov web documentation); you can look at the motor imagery scenarios how the left/right detection works. The challenge is twofold: 1) code the reception of th...

Hi Luke, the 'clearest' indicator there about the reason of the fail is that the 'gdi32.lib' seems to be missing. Could it be this problem: https://stackoverflow.com/questions/33599723/fatal-error-lnk1104-cannot-open-file-gdi32-lib/47175728 Since we generate everything by cmake we cannot directly ap...

Hello, this depends on the operating system, on windows the log file location is C:\users\yourname\appdata\roaming\openvibe-version and on linux .config/openvibe-version/ The log you're interested in should be called openvibe-designer.log, but some other files there might be sometimes useful too. Ch...

Dear all,

Maureen Clerc's group at Nice area, France, has a position open on EEG headset design. Likely it will also involve working on a P300 speller that uses OpenViBE as its signal processing backend.

Please see the attached file for more details.

Cheers,
Jussi