Under old windows, too .. but as top comment says, quality is quite surprizing, considering all limitations.
https://m.youtube.com/watch?v=4U32Hl4uSBs "USB video capture in 2002: Dazzle DCS 200" mpeg2 SD video (NTSC/PAL), at around 6 Mbits/s ofcourse capturing raw/lossless is superior ... if you have hd space. But I guess analog/noise filtering part in those old parts was main feature and not afterthought like on some more modern devices {echoing from comments}
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