Comparing videos in Protern Video

Protern Video can play two videos side-by-side and display the difference in speed and time between the athletes.

1. Compare button locations
2. Selecting videos
3. Lining up the videos
4. Selecting data overlays
5. Changing videos

Compare button locations

The compare feature can found from the gallery, video detail screen or when you click the analysis icon in full screen video mode.

1. Gallery locations
   1. Option menu on video thumbnail
      
   2. Multi-select option menu
      
2. Video detail screen
   
3. Video full screen mode
   

Selecting videos

When you click Compare, Protern video will load the first video into the left or top location, depending on your devices' orientation or size. 

1. Tap Pick Video, a window with all your videos will open, and it will scroll down to the same date as the previously selected video.
   
2. Select a video to compare. Note that the previously selected video for comparison will be marked.
   

Lining up the videos

Now that you have two videos ready for comparison, you have to line them up with a common landmark.

1. Play the first video until the athlete is at a landmark that is common to both videos (e.g. a ski gate)
2. Use the single frame advance/retreat or five frame advance/retreat to fine tune the position of the athlete. You may want to zoom in (pinch for touch screen, scroll wheel for computers) to get better detail.
   
3. When you are satisfied with the location of the athlete in the first video, repeat step 2 for the second video
4. Click the Lock icon to lock the two videos together.
   
5. To readjust, click the Lock icon again to unlock and readjust the videos like you did in step 2.

Selecting data overlays

When comparing videos, there are different data overlays available. Simply click on the Analysis icon.

Changing videos

1. Click the name of the athlete at the top of the video to change videos
   
2. Select new video to compare.