Vernier Video and Logger Pro Guide - Manual (Page 7)

Video in Logger Pro 2011 7
Logger Pro file and in the same directory as the Logger Pro file. If you have not changed
any Advanced Settings the video files will be named sequentially, MovieCapture1,
MovieCapture2, etc.
Video Capture While Simultaneously Collecting Data
Complete the Quick Start Instructions shown above. Complete any sensor configuration
needed, including data collection rate and time.
1. The Video Capture dialog box will show live video. Click the Options button to open the
Video Capture Options dialog.
2. Choose the Video Capture Synchronized with Sensor Data Collection option.
3. If data collection will run more than 10 to 15 seconds, you may want to capture a time-
lapse movie to avoid creating a very large video file. To enable this mode, click the Time
Lapse Mode option, and choose how often an image should be collected.
4. Click .
5. Click the Start Capture or Start Time Lapse button to start video capture and data
collection together.
6. At the end of the capture, a movie object for the capture will appear on the Logger Pro
main window.
7. To save the movie or movies, choose Save from the File menu. Choose the appropriate
folder and give your Logger Pro file a name. The movie(s) will be saved with your
Logger Pro file and in the same directory as the Logger Pro file. If you have not changed
any Advanced Settings the video files will be named sequentially, MovieCapture1,
MovieCapture2, etc.
Take Photo
You can take a snapshot, treated as a picture in JPEG format, from your movie by clicking the
Take Photo button.
Video and Data Synchronization Detail
Logger Pro will allow you to set a characteristic delay between video and data streams so that
subsequently collected videos will not require additional synchronization.
There is a delay between the moment you click the Capture or buttons in Logger Pro and
when data collection actually start. Similarly, there is a delay before video capture actually starts.
These two delay times are different, and depend on the hardware being used. In addition, there is
some run to run variation in these times (jitter) but the variation is typically much smaller than
the difference between the two delay times.
As a result you can sync one collected video with its sensor data, and use that relative delay time
to set up subsequent video capture with data collection runs. To the extent that the jitter is small,
the subsequent runs will not require additional synchronization.