[FieldTrip] EGI mff file import

[Schoffelen, J.M. (Jan Mathijs)]

Dear Raphael,

I happened to bump into Trey Avery, from Philips/egi the other day, and he mentioned that you might want to consider to increase the java heap memory to a larger value. How this can be done is shown here: https://www.mathworks.com/help/matlab/matlab_external/java-heap-memory-preferences.html

That is, in your message you are a bit ambiguous as to where exactly in the code the slowdown takes place. If it is indeed preproc, as you mention, then it’s probably not an input/output problem.

Anyway, it wouldn’t hurt to try I think. Could you let us know whether this works for you? In that case we can add this to our documentation section of ‘getting started with egi data’ on our fieldtriptoolbox.org<http://fieldtriptoolbox.org/> website. Also, the current version of that part of the documentation could be improved a bit I think to reflect better the recent improvements to the code (i.e. the use of the v3 reader…). Feel free to suggest changes yourself.

Best wishes,

Jan-Mathijs

On 24 May 2019, at 15:58, Raphaël Thézé <raphael.theze at gmail.com<mailto:raphael.theze at gmail.com>> wrote:

Dear all,

I have a question regarding the import of mff file format.

I used to import my EGI data with fieldtrip version 20180201 which worked fine (with egi_mff_v1) but when I switched to fieldtrip version 20190325, it uses egi_mff_v3 as default. The latter also works well except that when it used to take 1 sec per trial to be imported with V1, now it takes about 1 minute per trial with V3. The amount of time needed to import one subject in my case would be theoretically 3 hours, which is ridiculously long. I understand that the switch of version takes place in ft_read_data, which is called by ft_preprocessing, but apparently it is preproc, also called by ft_preprocessing, that takes forever to compute, but I can't explain why. I tried to manually request to use the version egi_mff_V1 but then there is an error regarding xml file, that I have not tried to explore so far.

For now I will just go back to the 20180201 version of fieldtrip so I can quickly import data into matlab, but I would like to understand what is going wrong here, or if it is to be expected.

In advance, thank you all.
Best,
Raphaël
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