It is only 2GB in size, so should not need compressing.
Unless the audio/video formats actually say "Uncompressed," the files are compressed to a storage, viewing, or editing specific compression format. If really uncompressed, then compressing the content will make the file small enough to burned to a CD rather than a DVD allowing faster burn/playback media characteristics.
How do I burn my QT movie to a DVD so that the resulting DVD movie can be played back with QT?
The the easiest way is to 1) Convert files to a specific target compression format, 2) Create a "burn" folder, 3) Drop one or more compressed files to the burn folder, 4) Press the "Burn" button, 5) Insert a blank media disc, 6) Name the disc, 7) Start the burn, and 8) Wait for the burn to be completed or verified.
QT 7.6.4 simply does not play the video once it is on DVD.
Not sure what your specific problem is here. If you burned a DVD using iDVD, then you need to play the content with the Apple DVD Player (included with Mac system) or Front Row (included with Mac system) or some other third-party application like VLC (free) or MPEG Streamclip (free). If you burned the file as data for playback in the QT Player, then are you having the problems described by QT Kirk above. If so, then return to step one and re-compress the file SPECIFICALLY for CD/DVD playback if that is what you really want.
To compress the file specifically for CD/DVD playback, I would recommend you compress the original file to an H.264/AAC multi-pass format which allows you to select the "Optimized for: CD/DVD" packaging of your movie(s). Specific settings depend on your original file dimensions and your tolerance for quality. A video data rate of 1600 kbps with audio data rate of 160 kbps w/48.0 KHz sample rate will normally produce SD files with with quality somewhere between VHS and DVD quality depending on the quality of your source file. HD content can be burned using the same data rates but some loss in quality will likely be seen. (I usually keep the dimension in the 640x272 to 853x480 range for most of my content but have burned HD content at higher video data rates to higher quality/increased speed capable media with good results but compression times seem to increase geometrically or exponentially.)

with such files on my PB Pro.