The View Mode pane allows you to select the current viewing mode.

View Mode


View Mode Descriptions

A Only 		Display only Viewport A; i.e., the video sequences associated with A.
(Note: Viewport B may be playing).
B Only Display only Viewport B.
(Note: Viewport A may be playing).
Side-by-Side Display Viewports A and B side –by side.
Seamless-Split Display Viewports A and B flowing as if they were 1 video sequence.
The left side of the display is Viewport A, the right side is B.
Split-Mirror Display Viewports A and B, with B inverted right to left as if in a mirror.
A-B Three types of A-B exist:
  • A display of the pixel differences,
  • A display of the absolute value of the pixel differences over a threshold for just the Y or Chroma values, and
  • A display that the pixels are different beyond a threshold for just the Y or Chroma values. If the pixels are not different, then the original video sequence is shown.

The Color Space Pane controls which mode is active.
If (A-B difference threshold in the Color Space pane) is unchecked, then each pixel in video sequence B is subtracted from video sequence A. The result is displayed. If the resultant is less than absolute black, then absolute black is displayed.

If (A-B difference threshold) is checked and (A-B Add Back) is unchecked, the luma (Chroma unchecked) or chroma (Chroma checked) pixels in video sequence B are subtracted from video sequence A. If the absolute value of the subtraction is greater than the threshold, the result is displayed.

Note: In either of the above, the value is probably a small number. Using the Color Space pane, the user can load a LUT (look-up table) to enhance small differences. There are many LUT examples under www.videoclarity.com/Support (Miscellaneous Support Files).

If (A-B difference threshold) is checked and (A-B Add Back) is checked, the luma (Chroma unchecked) or chroma (Chroma checked) pixels in video sequence B are subtracted from video sequence A.
  • If (A-B) >= Threshold, a Green pixel is displayed
  • If (B-A) >= Threshold, a Yellow pixel is displayed
  • If (((A-B) < Threshold) && ((B-A) < Threshold)), the original video sequence is displayed
Note: B-A can be achieved using the Play Control Pane's Swap A/B.


In a typical operation, the original uncompressed clip (the original source file) and the corresponding decompressed clip (a compressed version of the source file, decompressed by ClearView ) are shown as successive thumbnails.

Note, however, that there is no restriction on the assignment of clips to Viewports. You are free to assign any still or clip to either Viewport, whether that makes any sense or not. Thus you could do an A-B of a still and a clip, or A-B of two totally unrelated clips, and get visually entertaining but totally meaningless results.

Select VTR Mode

The VTR Control pane functions similar to a VCR allowing full temporal control of the sequence(s) being viewed. For each clip, the currently mapped sequence and currently displayed frame number are displayed in the two fields next to the labels Viewport A and Viewport B.

VTR Control


VTR Control Descriptions

Viewport A, Viewport B 		This is an information message. It is the name of the sequence(s) playing and the current frame number.

Note: The frame number does not increment smoothly while playing. This is because GUI updates (refreshes) are a low priority to keep the video playing well.
First Move to the first frame.
Jog- Jog backwards one frame.
Play- Play backwards at the chosen rate. Rate is chosen in the Clip Alignment pane
Stop Do not process any more data. Stop.
Pause Continue to process the current frame at the displayed rate.
Play+ Play forwards at the chosen rate. Rate is chosen in the Clip Alignment pane.
Jog+ Jog forward one frame.
Last Move to the last frame.
Slider Bar Move to a specific frame. The frame number is displayed above the VTR controls; next to the Viewport video sequence name.

Note: the slide bar does not move when the file is playing