For instance, a TV series that runs at full 60fps will only play at 25, same with PAL on NTSC at 30.
Umm... huh? As Sorceror says, there aren't many DVD players which bother with standards conversion any more. I had one years ago, a Samsung, and while it was by no means clever, I'm pretty sure it did maintain the full frame rate (but only by dropping/duplicating fields).
DE