are using the x264 so well compressed to fit on DVD9s (zweilaguige DVDs), or even a normal DVD, what a cheap, own-HD movies makes this possible without expensive on a Blu-ray burners (and media) need to be.
But beware: Not every blue-ray player that plays from then synonymous, and certainly not the cheap player from the first generation. Sometimes as synonymous help a firmware update, but not usually.