You never really know what hardware ships internally at any given time, ie what SoC a camera really is. They change frequently in random Chinese manufacturers with internal SoC hardware update with constant improvement (in their margins at least), if reported by someone at a point in time, buying the same model a 6mo-1yr later you cannot expect the same model number to be the same hardware.
It is rarely stated on a site selling them what SoC they use, or the vendors sites, assuming you can find and/or translate anything usable, or if the vendor is even still around more than a few months under that name. Therefore there is no repeatable source of products you can get reliably across time without simply testing a sample and hacking your own as you go.
I really wish someone would take initiative to sell/resell a line of camera hardware with openipc or other open firmware on them. It's a business opportunity sorely missing with nothing to offer home/business users ip cameras with open sterile and guaranteed secure firmware vs. random pure Chinese jank.