Synchronizing Video From a GoPro With Data From a Data Logger
Since the video and data are coming from 2 different sources it is very important that they are “synchronized” together in the software otherwise the video and data will not match.
The analysis software currently supports 2 different ways in which this can be done:
- automatically using GPS embedded in the GoPro video file (MP4 or LRV)
- manually by selecting a common point in the video and data
Note that using the embedded GPS data is much simpler, and so preferred – however this is only available as an option if the GoPro camera used has GPS.
When the GoPro data is loaded, it is automatically scanned to see if it includes valid GPS data, if it does then the user is asked if this should be used to synchronise. Alternatively the video and data need to be synchronised manually in the “video” tab of the run manager.
For the GoPro embedded GPS to be used for data synchronisation, the GoPro and the data recording must be started within 10 minutes or each other.
This is done by loading in the video and then selecting a particular frame of video and a corresponding point on the data that matches, and then clicking "lock". This is done in the “Run Manager”, in the Data menu:
The synchronization controls are displayed once a video has been loaded in the “video setup” tab
Use a combination of the video play controls, together with the course and fine skip/jog controls to find a particular part of the video, and then click on any graph at the same point in the data – and then click “lock”.
The key to manually synchronizing the data and video is to find a point in the data and video that perfectly match. The simplest way to do this is to make sure that the data logger is within view of the video recorder, so if you start the video recorder first you can see exactly when the data logging starts. Alternatively you can identify in the video and data when the car first pulls away from a standing start, or the first braking point etc.
On this screen it is also possible to select the automatic synchronization options just as if they were used at the time of loading the video file.