Video Terminology

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Video Terminology

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Video Terminology

Frame Rate

Frame rate (also known as frame frequency) is the frequency (rate) at which an imaging device produces unique consecutive images called frames. Frame rate is most often expressed in frames per second (FPS)

The human eye can process 10 to 12 separate images per second, perceiving them individually. The eye holds onto one image for about one-fifteenth of a second, so if another image is received during that period an illusion of continuity is created, allowing a sequence of still images to give the impression of smooth motion.

Animation Time Line

The Animation Time Line represents time extending from 0 seconds on the left, up to 90 minutes on the right (when zoomed out to maximum extent).

·The Animation Editor Window scale ranges from a thousandth of a second to minutes.
·The Time Line can be zoomed in and out using a the mouse scroll wheel. To zoom in scroll forwards (away from body) and the inverse to zoom out.

Focus Time Marker

·A Focus Time Marker (a red inverted triangle and dashed vertical line) is superimposed on the Time Line and indicates the current position of the animation.
·Only if the position of the Focus Time Marker in the Animation Editor changes will the 3D Window be updated to show the new state of the selected animation.
·Changes to the Gantt Chart focus time or changes to the position of the camera in the 3D Window do not update or affect a selected animation.
·An option is provided to update a Key Frame with the current state of either the Camera or the Focus Time.
NOTE:The Focus Time Marker in the Animation Editor Window is independent of that found in the Gantt chart.   The Focus Time in the Gantt chart is represented by a Keyframe in the Focus Time channel.


A channel distinguishes the animation of one item from another.

·SYNCHRO provides 3 channels, Camera, Focus Time, and Event.
·The Camera channel allows the addition of Key Frames that define the camera position at a point in the animation time line.
·The Focus Time Keyframes define the Focus Time at that point in the animation time line.
·The Event channel stores which 3D Grids and 3D Annotations are visible at any time.


Any number of Keyframes can added to an animation.

·Each Key Frame records the properties of the channel at a chosen time on the animation time line.
·A line connects 2 Keyframes, and a symbol is used to depict the Interpolation Type between those Keyframes.

Interpolation Type

The term interpolation is used to describe the transition from one state to another, which for a camera could be from one position to another, or for focus time one time point to another.

The interpolation type dictates how the transition is achieved and has include Curve, Line and Step options.

Interpolation Type:

Camera Behaviour:

Focus Time Behaviour:


Linear interpolation between 2 points is along a calculated curve between the 2 points



Linear interpolation between 2 points is along a calculated straight line between the 2 points

Linear Interpolation between 2 focus time positions


No interpolation, jump from 1st to 2nd position.

No interpolation. Step from 1st to 2nd focus time position


Camera Rotation around the currently selected 3D object. When selected the Turntable Options dialog is displayed to configure the rotation. After the Turntable Options are configured, you may deselect the 3D object.


3D Path

Camera follows the selected 3D Path using the camera angle of the first keyframe relative to the path. When this Interpolation type is chosen, the following dialog is displayed to choose the path to follow:


NOTE:An animation must first exist and be selected prior to viewing or editing an animation - see Navigator->Animations for more details

Related Topics:

Animation Editor

Keyframe Operation

Generate Timeline

Live Capture Recording

Playing an Animation