I have a samsung bd-p1590 player that i am running the audio from into a panasonic sc-pt770 theatre surround sound system via a digital optical cable. I have audio output options from the blue ray player for PCM, bitstream (re-encode), and bitsream (audiophile). I tried the bitsream (re-encode) as i thought that it would be the best choice, but I can't get any sound that way. The PCM and audiophile option gives me sound however. The surround unit is able to decode surround sound signals. Which is the best choice here for me. Thanks.