Rolling Shutter is available in the Edit: Repair Pack.
Some capture methods used by video cameras produce an effect called rolling shutter. This is particularly common with DSLR cameras. Rolling shutter can be identified by a wobbling, jelly-like instability in the frame during rapid movement.
The rolling shutter effect is designed to counteract rolling shutter, correcting the video and minimizing the effects of rolling shutter.
Shutter direction is used to define whether the camera uses a vertical or horizontal shutter. Consult your camera’s specifications for more information.
Correction
The correction property is used to specify the amount of time it takes for the camera’s shutter to travel across the frame.
In the case of cameras using a vertical shutter, this is defined as the time it takes in frames to capture from the top row of the image to the bottom row.
Positive values indicates the vertical shutter is travelling from top to bottom, while negative values are for bottom to top. You should consult the specifications of your camera to find the correction value to use.
Shutter sync
This property determines which part of the rolling shutter frame should be used to fix the image.
- -0.5 will use the frame at the beginning of the vertical shutter capture, as defined by the correction property.
- 0.0 will use the frame halfway through the vertical shutter capture. This is usually best as it will result in the minimum amount of distortion.
- 0.5 will use the frame at the end of the vertical shutter capture, as defined by the correction property.
Optical flow
Rolling shutter works by tracking the movement of every pixel in the frame using optical flow techniques.
The View menu can be used to observe the accuracy of the optical flow track.
Different videos may require adjustments to the optical flow properties. Adjusting the Window size and Sigma properties tend to yield the best results.