There seems to be a driver for the SAA7231 chipset. I found it here: add saa7231 driver · stsp/BeholdT8@e85a3f0 · GitHub
Here some more information about the hardware: Re: saa7231 is anybody trying · winysrj/linux-media@072daef · GitHub
I also cant find anything about that hardware here: https://bitbucket.org/crazycat/linux_media/src/latest/
This driver does not seem to be mainlined. Does someone know why? Can someone mainline the driver to the linux kernel or at least put it into libreelec or crazycat (that is been used by libreelec) code?