OpenViBE forum

Hello, you need to connect another stream called 'Channel Units' stream from the acquisition client box to the signal display box. The toolbar in the display should reveal a button to show or hide the units.


Cheers,
Jussi

Hi, you need to read the instructions about openvibe's expectations regarding csv format. You can find details from http://openvibe.inria.fr/csv-file-format-description/ Those are for the new csv boxes; the old ones had a bit different conventions. You can click on a box and then press F1 to bring u...

Hi, both are just names given to numeric codes. The ones with 'gdf' mentioned in them are likely corresponding to codes used by the gdf file format and adapted originally from there. The others are native to openvibe. OVTK is short for OpenViBE ToolKit.

Cheers,
Jussi

It must point to a classifier file created by Classifier Trainer box successfully run beforehand, typically in another training scenario.


Cheers,
Jussi

Hi, linker errors can be tricky. These days some vrpn examples are compiled together with openvibe, so if you manage to compile the whole thing, you could look what its linking to (use build.cmd --vsbuild-all to get an .sln) and then adapt to your project. I'll try to remember check igäf the tutoria...

Hello, the classifier processor box is trying to load some old file instead of file generated by a previous step. Check file paths in the trainer and processor boxes and make sure you've run all steps. The asio error could be due to acquisition server not being in the play state while you run the sc...

Hi, I recommend using regularized csp trainer and reading its box documentation. The code basically does one eigendecomposition of certain matrix (see doc refs and/or code) per class, and picks k eigenvectors with largest eigenvalues per class and packs these into csp filter matrix. The appropriate ...

Hi, that is not possible afaik. What you can do instead is to delay the event timeline by a number of seconds. Look at motor imagery tutorials for example. They typically start the Graz paradigm visualizations only after 30 secs.


Cheers,
Jussi

Hi, this is mainly a matter of learning to program in whatever language your app is developed in. Here's the protocols that can be used for communication,

http://openvibe.inria.fr/overview-sendi ... -openvibe/

Good luck,
Jussi

Hi, are they identical versions of openvibe too? In some older ov versions the matlab scripting box had memory leaks that we've fixed since. You could of course try to run a profiler on each computer and see where the time is spent during the run (if not inside matlab). The differences in the two re...

Hi, what do you mean by sample per count? The buffer (chunk) size in openvibe? I'm not sure if anything bad happens if the chunk size doesn't divide the sampling rate neatly. Its just the blocksize that acquisition server uses to pass out the samples. Very small chunks cause more processing overhead...

Its probably that the multiplexer expects both streams to have identical structure in the time sense or something. Not sure. I haven't often used that box. You could try to use signal concatenating instead while the data is still raw signal. Make the concatenation box read the previous recording and...

No, unfortunately not any good ones. Signal/marker alignment for P300 is usually necessary to be quite precise as the used signal processing is not robust to time jitter or varying shifts of the signal wrt the flash onset. In your case the knowledge of what time it is when each sample is obtained in...

Hi, You mean incremental between sessions? In single session the example bundled in box-tutorials/ should retrain the classifier with all the data so far. Perhaps you're doing something differently? If you wish to do incremental between sessions the most lightweight might be to save each feature vec...

ChangeLog since 2.0.1 meta [Build] ImproveOutofSourceTreeBuild [Build] Provide sensible default values for several directories at build time. extras [Drivers] Added channel scaling to LiveAmp driver [EEGO] redefine std::make_unique (C++14) for c++11 compliance [EEGO] Added wrapper around the loop me...