sigviewer

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I have downloaded some EDF data from the PhysioNet EEG database. I am able to import the data into sigviewer 0.5.2 and it renders properly. However, when I export the data neither sigviewer nor OpenViBE can read the resulting file.

@brylie Thank you for reporting this problem. Looks like we have some problems in the exporting function. But as far as I know, the convertion function between different formats is no longer available in the newest version of Sigviewer.

@cbrnr should we add the function back and solve the bug?

Exporting to GDF was never officially working unfortunately. I just tested this, and although SigViewer crashed right after exporting to GDF, it created a GDF file which did not contain any signals but only events.

Although sometimes it would be useful to have SigViewer convert files to GDF, this was never its main purpose. We added the feature because we thought if it worked sometimes it is better than not having the feature at all. I think that implementing a proper export function would require a lot of work and testing, e.g. which formats can be converted to GDF? Why convert only to GDF and not other formats? What about XDF? And so on.

For now, I suggest we focus on other features and issues and leave the export functionality for later. @brylie, if you really need to convert EDF files to GDF, you could use BioSig for Octave/MATLAB. If you want to export events only, we just implemented a new function to export events to CSV files (which actually works ;-)).