The burn dialog is similar to most of Nero’s other burn dialogs. You can choose to burn your project to any of your optical drives or save it as an NRG disc image (which, as of Nero 6 or 7 is actually just an ISO file with an NRG file extension in many cases). You can set a volume name for your disc, set the write speed and a few other options.
The main methods to compress large files into DVD are: 1. Use compression software to reduce the file size to fit a DVD. 2. Change the large file format into a smaller one for example from MP4 to FLV. 3. Change the large file parameters like bitrate, resolution and frame rate. 4. Can burn the video to split into some parts and compress video.