Clip Alignment
The Clip Alignment Pane allows user control of display speed and defines the first and last frame to be played on either viewport. This is used to line up similar clips captured at different frequencies or with different start/end points.
Clip Alignment
Clip Alignment Pane Descriptions
| Clip Alignment Speed | This can be set to any value. If you would like to play the sequence at 3fps, and you are outputting at 30fps (or 60 fields per second), then set the speed to 3fps/30fps = 0.1. The thumbnail increments by a 1/10th, but you can enter a more precise fractional number using the keyboard. We recognize speeds in the Y.ZZ format (1 digit before the decimal point; 2 digits after the decimal point).
Note: Viewport A and B will run at the same speed as long as Lock A/B Spd is checked. |
| First | This is the first frame that will play.
Note 1: Viewport A and B are set independently to allow you to align clips Note 2: 0 (zero) is the first frame |
| Last | This is the last frame that will play.
Note 1: Viewport A and B are set independently to allow you to align clips Note 2: If you need to reset the Last Frame, set it to 99999 or press backspace/delete, and the software will automatically reset it to the last frame. |
| Lock A/B Spd | Checking this sets Viewport B to play at the same rate as Viewport A. Unchecking this allows Viewport A and B to operate at different rates. Note: Viewport A has a video sequence originally compressed at 3fps. Viewport B has the uncompressed video sequence. To play these at the same rate, set Viewport A’s Speed to 0.1 and Viewport B’s Speed to 1.0, and Uncheck this box. |
| Temporal Align | Pressing this box performs a PSNR on every frame for the Video Sequence associated with Viewport A with respect to the currently displayed frame in Viewport B.
If successful, the First frames are set based on the frame numbers of the aligned frames. The Last frames are set to First frame + min (Frames remaining in Viewport A, Frames remaining in Viewport B with compensation for speed differences). Note 1: While it is performing the auto alignment, this box will change status from Auto Align to Aligning. Note 2: To ensure a successful auto align, go to the first non-repeated frame in Viewport B. If there are repeated frames, ClearView will find the first frame. |
| Thrsehold | After the auto alignment is complete, the PSNR between the two aligned frames is checked against this value. If the PSNR is lower than this value, then auto alignment is declared to be unsuccessful, and the first and last frames are not set.
Note 1: While it is performing the auto alignment, this box will change status from Auto Align to Aligning. Note 2: To ensure a successful auto align, go to the first non-repeated frame in Viewport B. If there are repeated frames, ClearView will find the first frame. |
Note: Please remember to have the same number of frames if you are going to Play the clips in a loop (see the Play Mode pane). Also note that you can deliberately cause errors in the analysis if you play the same clip in both viewports but the clips are off by as little as 1 frame, especially if there is rapid motion in the clip.