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SynchronizingGoProVideo / UsingDateTimeStamp

Automatic Synchronization Using File Time/Date


If it is not convenient or possible to use the GoPro control lead, the next alternative is to use the time stamp on the video file to synchronize the data and video. In this case the time is taken from the video file and the time of the data is known from GPS. For this to work the time and date on the GoPro must be set accurately. To do this please refer to the relevant sections in the GoPro manual.

Since it is almost impossible to get the time on the GoPro set exactly, the software allows stores an offset between the video and data. In practice this means that for this to work well, the following procedure needs to be followed:

  • set the GoPro time/date as accurately as practical
  • record some sample video and data
  • load the data and video into the Analysis Software
  • manually synchronize the data and video, this will trigger the software to calculate a time offset between the video and data time stamps which is then stored
  • since a valid time offset is now stored in the software, the data and video can be automatically synchronized in future by simply selecting the correct option

After an initial set up, this option works very well - however note that after some time (weeks) the internal clock of the GoPro might drift off by some seconds and it will be necessary to repeat the time offset calculation process. GPS time in the DL1 data file is extremely accurate and does not drift.

An alternative is to use a combination of the above 2 options (the control cable and the file time/date. To do this the procedure for a weekend of racing might be something like this:

  • set the GoPro time/date as accurately as practical
  • connect the DL1 to the GoPro with the control lead and record some sample video and data, just long enough to include a good GPS fix in the DL1 data so that GPS time is available.
  • load the test data and video into the Analysis Software using the “control lead” option, this will update the time offset that is stored in the Analysis Software
  • for future runs there is no need to use the control lead, so you can put the GoPro back into its sealed enclosure and instead synchronize the video and data just using the time stamps.
Page last modified on January 21, 2019, at 09:29 AM