Burning 5 movies on 1 dvd (4.7gig)

I have always used NERO 6 Express as my main burning software. I have also always burned movies I have downloaded and am able to fit 5 to 6 movies unto 1 dvd (4.7gig) These files are about 700mb each and are in .avi format. I burn these files to a dvd by (DATA) dvd.

My question is does NERO compress the actual file to the point where the video quality is reduced because of fitting 5 movies unto 1 dvd? Does it actually affect the quality of the file in any way?

I was wondering because I recently upgraded to NERO 7 Ultra Edition, and it has allot more features than 6. Like for example I can actually make a real DVD-Video from an .avi file. It actually makes the .nfo .vob files i guess it converts the .avi to dvd basically. I have noticed by burning in this way it only fits 1 .avi movie that is 700mb and claims it to be 4.6gig.

So if I burn using (DATA) method and not DVD-Video, I can fit 5 or 6 700mb .avi files that can playback on most dvd players anyways, but if it compresses the file and degrades the quality of the file than I rather not use (DATA) and just store 1 .avi movie as DVD-Video method. So if anyone could clear this up for me I would really appreciate it.

p.s The file after I burn it using DVD -DATA is still the same 700mb. Maybe its all in my head that the video quality changed compared to the original played on my hardrive. (These are movies that I have downloaded not from actual DVD movies)

Thanks!

 

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