When changing size and/or aspect ratio of the video panes (input / output) in VirtualDub, the image might show ugly aliasing artifacts like Jaggies, for example.
[SOLUTION]
This is caused by the resizing algorithm used to display the image.
VirtualDub is able to use OpenGL's filters to resize the image with a better quality.
In order to enable a better resizing algorithm, do the following:
- Options > Preferences > Main > Display
- Chech the option "Use OpenGL"
- Save and exit the dialog
- Right-click on the video pane to resize
- Select a suitable resizing algorithm as "Preferred Filter" (Example: In v1.9.11, there are 3 available: Point, Bilinear and Bicubic)