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I understand where you are coming from, now. I am unsure of the reason why the person you responded to wanted a "real" DVD, so we'll have to see if they respon

• thaumasiotes 13y ago
  The most standard (I believe) is certainly lossless: dd if=/dev/cdrom of=name_of_disc.iso creates a bit-for-bit image of the disc. If you're trying to shrink the data, that's obviously useless, but it works fine for copying discs. Ripping to video files, instead of to a disc image, may or may not be lossless depending on the format you're targetting, but the norm (again, I believe) is to be lossy, since you can achieve really large amounts of compression. All that said, it's really not that difficult to judge video quality directly; what you can't perceive literally doesn't matter. In my ripped video of The Princess Bride (completely legit, in that I ripped it myself from a DVD I owned), I eventually noticed that color was occasionally washed out, but only because I was going frame-by-frame trying to get good images of the swords. I would never have known otherwise.