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CD is uncompressed. Minidisc uses ATRAC compression. So not 1:1
CD to CD is only 1:1 for CD-ROM, not CD-Audio as audio has no error correction, though mostly the results are better than analogue tape and very many more generations are possible.
D-VHS uses compression, so any normal copying will multiply compression artefacts. Won't be as a bad as analogue VHS.
I don't think the video example is real because VHS has noise, drop-out and head switching, so degrades faster than that. NTSC is worse than PAL. Even original VHS recording has noticeable colour smearing on many machines on 1st recording as the colour bandwidth is much poorer than PAL and the time delay may not be accurate. The 3.57 MHz (NTSC) or 4.43 MHZ (PAL, SECAM) is converted to about 768 kHZ carrier recorded separately to the mono Luminance FM carrier. Called "Color under" and was originally an add on to EIAJ 1/2″ reel to reel machines. The Philips N1500 and N1700 cassettes and also Sony U-Matic (both predated Betamax and VHS) used a similar scheme.
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