Thanks, sumerJ. Your explanation that mp4 has better compression than mp2 must be what's happening. I discovered in going back to compare the file sizes again that I must have been going off of the PowerProducer file size for the first DVD...when I went back to my source files for the first DVD, they were only 2 GB in size. So I spoke erroneously in my first post...those original files doubled in size for the first DVD as well.
The DVD movie I'm trying to create now is about 2 hours long, and I'm using regular DVD+R discs (4.7GB, 4.38 GB available).
I did discover just now that selecting the "SmartFit" option in settings gets me a lot closer (4.75 GB) to my goal of fitting the next set of files onto 1 DVD. I might just cut some of the less necessary video from the files, though I'd like to understand exactly what tradeoff I'm making by selecting "SmartFit." In the preview screen on my computer, I don't see much difference in the "SmartFit" video vs. the non-SmartFit video, but maybe I'd notice the difference on a larger TV screen. Do you have any way to advise me on how much I'm losing with the SmartFit compression?
If the impact will be significant on a larger screen (I'm making DVDs for a relative who has a large home theater...something like a 120" screen), then I won't use SmartFit. We watched the first DVD on that home theater system and it was fine for what it was. I guess I could create the movie disc on a RW DVD and test it, but am wondering if you happen to know the answer about the compression and can thereby save me a lot of time. Thanks in advance for any advice!
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How long is your DVD movie of first DVD and now you want to create? 1 or 2 hours?
And, mp4 uses h.264 video format, which has better compression rate than DVD video - mpeg2. so, file size double might be a normal case.