[Mne_analysis] BrainVision files

[Alexandre Gramfort]

hi Boris,

our test data are in:

https://github.com/mne-tools/mne-python/tree/master/mne/io/brainvision/tests/data

don't hesitate to share a file so we can patch the reader to fix the issue.

Best,
Alex

On Tue, Jan 5, 2016 at 10:17 AM, Boris BURLE <boris.burle at univ-amu.fr> wrote:
> Dear colleagues,
>
> I'm just starting to use MNE-python, and I face a problem opening
> BrainVisionAnalyer files. When calling the
> "mne.io.read_raw_brainvision", I get the following error (full traceback
> at the end):
>
> --> 462     params, settings = settings.split('[Comment]')
>      463     cfg = configparser.ConfigParser()
>      464     if hasattr(cfg, 'read_file'):  # newer API
>
> ValueError: need more than 1 value to unpack
>
> It appears that 'read_raw_brainvision' is searching for a "section"
> untitled "Comment" in the header (vhdr) file. I have been using
> BrainVision files quite a lot (actually, I would like to get rid of it
> by using mne-python...), and I never encountered such a "Comment" field
> in my vhdr files. However, I always worked with data **exported** from
> BrainVision, not acquired with it. So I guess the "Comment" field the
> parser is searching might come from the files created by
> BrainVisionRecorder. But since I do not have any such file, I cannot check.
>
> I do have python code that, I believe, open all variants of files
> **exported** from BrainVisionAnalyser (be they ASCII or binary, 16, 32
> ... bits etc...). The code outputs a dictionary for the header (vhdr)
> file, a numpy.array for the data, and a list of events for the
> markers/events/triggers. Although I guess it should also open files
> created by BrainVisionRecorder, I cannot be sure.
>
> So, if someone could provide me with a small file that is currently
> openable by "mne.io.read_raw_brainvision", I would be happy to check
> whether my code also open it. And, if you find it useful, I would be
> more than happy to share the code and adapt it to mne-python (with a bit
> of help from you, probably ...)
>
>    All the best,
>      B.
>
> full traceback:
> In [4]: mne.io.read_raw_brainvision('COUBA_EMG_PC_CompLeft.vhdr')
> Extracting eeg Parameters from COUBA_EMG_PC_CompLeft.vhdr...
> ---------------------------------------------------------------------------
> ValueError                                Traceback (most recent call last)
> <ipython-input-4-b9123e703050> in <module>()
> ----> 1 mne.io.read_raw_brainvision('COUBA_EMG_PC_CompLeft.vhdr')
>
> /usr/lib/python2.7/dist-packages/mne/io/brainvision/brainvision.pyc in
> read_raw_brainvision(vhdr_fname, elp_fname, elp_names, preload,
> reference, eog, ch_names, verbose)
>      681     """
>      682     raw = RawBrainVision(vhdr_fname, elp_fname, elp_names, preload,
> --> 683                          reference, eog, ch_names, verbose)
>      684     return raw
>
> /usr/lib/python2.7/dist-packages/mne/io/brainvision/brainvision.pyc in
> __init__(self, vhdr_fname, elp_fname, elp_names, preload, reference,
> eog, ch_names, verbose)
>
> /usr/lib/python2.7/dist-packages/mne/utils.pyc in verbose(function,
> *args, **kwargs)
>      549         return ret
>      550     else:
> --> 551         ret = function(*args, **kwargs)
>      552         return ret
>      553
>
> /usr/lib/python2.7/dist-packages/mne/io/brainvision/brainvision.pyc in
> __init__(self, vhdr_fname, elp_fname, elp_names, preload, reference,
> eog, ch_names, verbose)
>       82         self.info, self._eeg_info, events =
> _get_eeg_info(vhdr_fname,
>       83
> elp_fname, elp_names,
> ---> 84
> reference, eog)
>       85         self.set_brainvision_events(events)
>       86         logger.info('Creating Raw.info structure...')
>
> /usr/lib/python2.7/dist-packages/mne/io/brainvision/brainvision.pyc in
> _get_eeg_info(vhdr_fname, elp_fname, elp_names, reference, eog)
>      460         settings = f.read()
>      461
> --> 462     params, settings = settings.split('[Comment]')
>      463     cfg = configparser.ConfigParser()
>      464     if hasattr(cfg, 'read_file'):  # newer API
>
> ValueError: need more than 1 value to unpack
>
> In [5]:
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