De-interlacing splits each frame of video captured at 30 FPS (25 in PAL) into two separate frames at 60 FPS (50 in PAL), with each frame representing one field of video. In order to preserve spacial dimensions, the two de-interlaced fields are line-doubled in the newly-created frames.
Once a file has been de-interlaced, you can manipulate the images -- for example, performing rotoscoping operations -- and then field-render the finished file with MovieTools prior to recording the file back to video tape or disc.
Viewed on the Mac, each de-interlaced frame will look odd, since pairs of lines in the de-interlaced file will have been derived from every second line in the source file. De-interlaced files effectively have one half the vertical resolution of the original files. But because every other line will be discarded anyway when the file is re-field rendered in MovieTools, this loss of resolution has no effect on the final results.
If you use MacAnimator Pro 2.0 or later to capture video in preparation for de-interlacing, make sure the MacAnimator Pro's Field Interpolation function is turned off, since it's effect is not necessary, and using it will simply extend the time required to capture the video.
Because MovieTools' de-interlacing function expands time as a basic aspect of its operation, it provides no support for audio. As its use was envisioned, this should present no problem. If you need to deal with sound channels in a movie, save the audio as a separate track that you can re-combine with the video after all processing (rotoscoping, etc. and subsequent run through MovieTools to field render) is completed.
De-interlacing a movie will require free disk space equal to slightly more than 200% of the original movie size. For example, if you're field rendering a movie with an original size of 100 MB, you'll need at least 205 MB free disk space.
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