How to use the input tab

Open input movie

The input tab is where you open the movie. You can clear the movie by clicking "Choose" then clicking "Cancel".

Interlace

In many cases JVC needs to know if the movie is interlaced. Most video is interlaced, including most DV and MPEG2.
Look for the tell-tale comb structure at the edge of horizontally moving objects.

Top field first

Most video is "bottom field first" meaning that the picture consisting of lines 2,4,6,...,480 of the video frames is 1/60 second earlier than the picture consisting of lines 1,3,5,...,479.

1/6 white line at bottom

Some European TV channels have a white control strip in pixels 130-260 of the bottom line. If you check this box JVC will remove it.

Cropping

You can crop the input manually or JVC can find black bars automatically. In the preview you can move the crop lines with cmd-arrow and option-cmd-arrow ("input tab" must be up in the main window and "manual" must be selected).
Choose "mask" if you have DV input and output or some other fixed size format. This formally leaves the movie at the same size but implements the cropping by adding a mask to the output movie.
Remaining width must be an even number and for interlaced video vertical crop amounts must be even (the software enforces this automatically).
Tip: to better view the effect of cropping set noise scale to 1 (= don't scale).