No clock offsets were available when using LSL and GUSBAmp
ali-sig-pro opened this issue · comments
I was wondering if you may guide how to deal with the issue 'No clock offsets were available for stream...'.
I use GUSBAmp and LabRecord from LSL to record EEG from g.USBamp. When importing the recordings with xdf extension using ImportingRecordingsInMatlab to Matlab, I face with the warning message 'No clock offsets were available for stream...'. I use at all one computer for EEG recording and also streaming LSL.
Does 'No clock offsets available' mean that the recordings were already messed up during recording because of something seriously wrong with timing and clock offset such that the recordings are not reliable anymore?
Any suggestion to dig/solve this issue?
Many thanks,
When LabRecorder records data, it periodically checks the clock offset
between the clock on the computer running LabRecorder and all the
computers hosting LSL clients from which it is recording. When the data
is loaded offline, these offsets are used to synchronize the various
data streams. (I have written that sentence so many times, I should have
it in a text file so that I can copy and paste it.)
Not getting clock offsets in your data file is a bug. But, since you are
using only one computer, the clock offsets that /should/ have been
recorded are very, very, very tiny (smaller than a microsecond, most
likely). In you case, you don't need to worry about this warning. If you
are streaming data from different computers across a network, you cannot
synchronize without the clock offset data. On a local host it is irrelevant.
I am going to close this issue and re-open it under a different title.
The reason is that I don't believe this has anything to do with the
g.USBamp connector, but rather it is a problem with either LabRecorder
or liblsl.
…On 8/24/2018 12:29 PM, ali-sig-pro wrote:
I was wondering if you may guide how to deal with the issue 'No clock
offsets were available for stream...'.
I use GUSBAmp and LabRecord from LSL to record EEG from g.USBamp. When
importing the recordings with xdf extension using
ImportingRecordingsInMatlab to Matlab, I face with the warning message
'No clock offsets were available for stream...'. I use at all one
computer for EEG recording and also streaming LSL.
Does 'No clock offsets available' mean that the recordings were
already messed up during recording because of something seriously
wrong with timing and clock offset such that the recordings are not
reliable anymore?
Any suggestion to dig/solve this issue?
Many thanks,
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