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movie files are VERY BIG and a twenty minute film at a decent resolution, we would be talking in gigs not megs, so be careful.



That's not entirely true. It's possible to have a 20-minute video at 640x480 to take far less than 1 GB, even without using a codec. The important thing you left out is the frame rate. The formula for finding the resulting filesize of a given video without codecs (uncompressed) is fairly simple:

size_per_frame = video_width*video_height*(color_depth/8);
frame_count = length_seconds*frame_rate;
video_file_size = size_per_frame*frame_count;

I don't know what DVD's use as a standard resolution, but at 640x480 at the standard 30 fps and 24-bit color, one minute of video uses 1.54 GB. Taking in 20 minutes' worth would get into the 31 GB range. Virtual Dub, as far as I know, doesn't support this high of a file size. From what I've seen, videos run through a codec of sufficient quality have about 50:1 compression turning 31 GB to about 630 MB. Of course, you can use whatever frame rate and resolution you want.

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