Using GDF files

About BCI and box tutorial/demo scenarios bundled with OpenViBE.
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nsprt
Posts: 7
Joined: Tue Apr 16, 2013 9:47 am

Using GDF files

Post by nsprt »

Hello,

I'm new to Openvibe and I'm trying to create scenario using BCI2003 Competition files. What is the correct way to use those gdf file, and to convert them to ov files. I did that using Generic & GDF reader/writer but the scenario doesn't work.

jtlindgren
Posts: 778
Joined: Tue Dec 04, 2012 3:53 pm
Location: INRIA Rennes, FRANCE

Re: Using GDF files

Post by jtlindgren »

Hello nsprt,

some more details would be useful, such as,

1) which files exactly? from where? if its not part of OpenViBE, whats the download link?
2) why doesn't it work?

If you think its a bug, please follow the general bug reporting guidelines,

http://openvibe.inria.fr/faq/#I+think+I ... hould+I+do+?

There's also this thread touching the subject,

viewtopic.php?f=6&t=251


Happy hacking,
Jussi

nsprt
Posts: 7
Joined: Tue Apr 16, 2013 9:47 am

Re: Using GDF files

Post by nsprt »

Thanks for the quick reply,

The gdf file from BCI competition, dataset IIIb : Non-stationary 2-class BCI data.
http://www.bbci.de/competition/iii/desc_IIIb.pdf

The signals are displayed but I don't know why the scenario doesn't work. How openvibe interpret the stimulations of those gdf files. Are they compatible each other.

jtlindgren
Posts: 778
Joined: Tue Dec 04, 2012 3:53 pm
Location: INRIA Rennes, FRANCE

Re: Using GDF files

Post by jtlindgren »

Hi,

I tried the gdf-reader.xml scenario included with OpenViBE on the O3VR.gdf file (the first test subject of IIIb) I downloaded from the site you mentioned. The default samples per buffer (32) in the GDF reader box causes a warning, but you can change this to 25 and the warning disappears. I couldn't see any particular problem.

What exactly is the issue? Can you be more specific?


Best,
Jussi

nsprt
Posts: 7
Joined: Tue Apr 16, 2013 9:47 am

Re: Using GDF files

Post by nsprt »

thank you jlindgren,


the display is ok, but no stimulation effecting to pass right or left when i used gdf but ov format is ok as you did in the scenario.

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