Try it,then test the output to see if they play correctly......
You will be working the machine pretty hard, might want to keep and eye on your CPU temp during your initial testing, Outputting to different physical HDD's might help too.
This is assuming your using a dual or quad core CPU !!!
I have ripped 2 at a time but never tried DVD > Mobile, I rip straight to HDD, I manually edit the PGC's !! The DVD ROM's are IDE and the mobo has 2 IDE channels/connections