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3400k may work, depending on content. For some things, it's fine, average compression. For others, it may be a tad too compressed, and you'll get noise. At 3400k, you'd usually be looking at 2.5 to 3 hours of content.
In order to merge footage in an MPEG editor, you'll have to encode the new segment to the same specs as the old one. I have no idea if the new files, with the 20 added minutes, will still fit a 4.38GB DVD-R or DVD+R, however. (Personally, I just give up, and run a project on DVD+R DL.)
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