Options for large class project...

Here's what you do. Compressor can automatically fit large projects on a DVD, regardless of their capacity when exported. Take your highest quality export, and make that your Target in a blank project in Compressor. Under the "Disc Burning" presets, you want MPEG-2 encoding, and Dolby Digital Professional for audio. Drag them one at a time onto your "Target". Select the MPEG-2, and go under "Quality" and set to 2 Pass VBR Best. Leave the Dolby Digital Professional alone. Then click on your target in Compressor (the space outside of the MPEG-2 and Dolby but within that whole rectangular space of the object) and in the inspector, go to Job Action. Select Create DVD. You can put in a title, and choose whether to "Play Automatically" or "Go To Menu" when the disc is put in a DVD player. Compressor will fit your 12GB file onto the DVD using the best quality compression while getting it within the 4.7GB capacity.

 

Do you realise that Motion is essentially motion graphics software and compressor is for video encoding/transcoding.

Using motion wouldn't allow you to get any better quality in the video image. The only way you could increase the perceived quality with motion would be to add fancy motion graphics or explosions etc.