Oki, I use LIFO method:
You can delete the original, since you no longer need them
As for quality, if there is a direct stream copy(As in VirtualDub, 'cause I don't know mkvtoolnix very well, I used it only a few times), then there is no quality loss, else, there is some loss depending on settings of codec, resolution etc.
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There exist a plot to enslave every man, woman and child
(John F Kennedy 1963)
Some pains are physical, some pains are mental...
But there is one that is both, it's Dental!
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