help with timestamp!

Comments

• DanieleP

  November 2016

  edit:

  I guess this is the culprit

          sample = self._tracker.get_frame()
          t1 = time.time()
          # put the sample in the Queue
          queue.put(sample)
          # release the Threading Lock
          self._lock.release()
          # Update the newest frame
          self._newestframe = copy.deepcopy(sample)
          # Calculate the clock difference
          self._clockdiff = sample['time'] - t1
  
• DanieleP

  November 2016

  I still have no idea about that 'time', but I managed to convert the timestamp from string format into unix timestamp format

  thanks to this:
  http://stackoverflow.com/questions/26161156/python-converting-string-to-timestamp-with-microseconds
• tsummer2

  November 2016

  Hi Daniele, I am glad you figured it out. I thought I would still share what I know about the timestamp because I am still trying to understand it myself.
  The correction seems to be necessary because the EyeTribe has its own clock which it uses to record the time a sample was collected. Pygaze is using the computer's clock by calling the time.time() function. These two clocks are not guaranteed to be synchronized. This correction is important for example when you want to send a message from python into the EyeTribe log file, and for it to correspond with the EyeTribe time. By taking the difference of the two times, you can determine how far apart they are. You can then add this amount of time to the last sample's time and you should supposedly get a more accurate idea of when the message was logged according to the EyeTribe clock.
• DanieleP

  December 2016

  thanks for the answer!
  I checked myself the synchronization and it seems OK.
  I will ask you more about this in the future, but now I realised I have a much bigger problem..
  see my next post