Did you use the correct HDMI output?
"Panasonic gets around this problem by offering a pair of HDMI outputs on the DMP-BDT310. One carries 3D video to the TV and the other carries lossless DTS-HD MA or Dolby TrueHD to your 5.1-channel amplifier. This solution might, at first glance, appear clumsy, but it's actually incredibly useful."
"Panasonic gets around this problem by offering a pair of HDMI outputs on the DMP-BDT310. One carries 3D video to the TV and the other carries lossless DTS-HD MA or Dolby TrueHD to your 5.1-channel amplifier. This solution might, at first glance, appear clumsy, but it's actually incredibly useful."