Comparison and synchronization¶
Two videos can be opened side by side using the Two playback screens button or the menu .
The timeline cursor in each playback screen can be moved independently.
Two videos can be synchronized by setting their time origin to a common event visible on both videos. When the videos are synchronized they will pass through their time origin at the same time.
To set the time origin in a video move to that point in the video and click the Mark current time as time origin button or right click the background of the video and choose the menu. Alternatively you can move each video to the correct point independently and use the Synchronize videos on the current frames button in the joint controls area.
During joint-playback, the synchronization mechanism means one video may start and/or end playing before the other.
To perform joint frame-by-frame navigation, move the cursor in the joint timeline or use the joint controls buttons.
The playback controls are the same as for individual playback screens but act on both videos at the same time.
The other buttons have the following functions:
Set the time origin in both videos to their respective current time.
Enable or disable superposition of the videos into one another.
Swap the playback screens.
Superposition paints each video on top of the other at 50% opacity. This is a basic mechanism to compare motion in-situ if the videos were filmed in the same environment with a static camera.