Hello MNE Forum, I’m encountering a time point mismatch when exporting EEG data to EDF format. My original EEG data is 8 seconds long, but the EDF file has 9000 time points instead of the expected 8000. The initial data points appears consistent when I compare the MNE data (io.brainvision.brainvisi…

Can you provide more details? What is the sampling frequency? What do the trailing (1000) data points look like? Can you maybe post some plots here so that we can compare the signals visually? We’d also appreciate if you posted the code you used to export your raw object to EDF. To let us fully repr…

Thank you very much! My sampling frequency is: 1000 Hz pause_segment_5 = pause_segments[i] for i in range(len(pause_segments)): mne.export.export_raw( f'pause_segment_{i}.edf', pause_segments[i], fmt='edf', physical_range='auto', add_ch_type=False, …

Can you plot the entire duration of the EDF signal (just one channel)? I would like to see what the last second of data looks like.

Hello, Thank you very much! I am sending the screenshots of EDF and MNE raw data. [Ekran Resmi 2023-11-13 16.25.20] [Ekran Resmi 2023-11-13 16.25.49] Also, this link you can access the EDF and FIF files. https://drive.google.com/drive/folders/13lm7EWK7KMlmc2xdVLxceCQsxNsHjY6T?usp=sharing

It has probably to do with how the record length is chosen for exporting to EDF. This is a technical implementation detail of EDF, which users should not have to care about, but apparently this trips you up here. Do you really need 8001 samples in your exported file? I think it would work if you ha…

OK, so here’s the full answer. Exporting to EDF currently means that signals must have an integer duration (in seconds). If this is not the case, like in your example which is 8.001s long, the exported data is zero-padded. MNE actually issues a warning in this case: RuntimeWarning: EDF format requi…

EDF Export Issue - Time Point Discrepancy

Support & Discussions

nursena November 13, 2023, 3:31pm 5

Hello,

Thank you very much!
I am sending the screenshots of EDF and MNE raw data.

Also, this link you can access the EDF and FIF files.
https://drive.google.com/drive/folders/13lm7EWK7KMlmc2xdVLxceCQsxNsHjY6T?usp=sharing

Topic		Replies	Views
RuntimeWarning: EDF Header Record Mismatch and File Size Issue in MNE Support & Discussions	7	162	December 21, 2024
Strange EEG data in EDF format Support & Discussions	2	186	April 24, 2024
EDF export warning Support & Discussions ieeg-and-ecog	3	385	December 28, 2021
data lost when exporting to .edf Support & Discussions eeg	1	268	August 16, 2023
Saving the preprocessed eeg data in edf format Support & Discussions export	1	1381	November 15, 2021

EDF Export Issue - Time Point Discrepancy

Related topics