I connected my HD tv up to my surround sound system via the optical out on the TV into the optical in on the home theatre system, but the sound is out of sync with the picture. This is also evident when i turn the TV volume up and have the surround sound volume up at the same time - the TV sound comes out before the surround sound.
If i run the surround sound through the AV audio out on the TV into the av audio in on the surround sound system, the sound is in sync on the surround sound system so it's only out of sync using the Optical cable.
My question is, is this being caused by my Panasonic surround sound system or is it to do with optical technology itself? I know it's not the TV causing the latency in sound because the sound coming out from the TV directly is fine and sound being sent from to tv to the surround sound system via av out leads is also fine.
I'd really like to use the optical out as we just had freeview HD installed and i would like to benefit from the 5.1 surround sound.... as the av cables only do 2 channel audio, not surround sound.
Also have a similar issue with the ps3. When i use "optical out" on the ps3 into "optical in" on the surround sound, movies/games are in sync but Singstar mics are out of sync. For example, if i say something into the singstar mics, it will come out the speakers a split second later. If i run the ps3 through av audio out, it's instant and there is no sound delay at all.
Beginning to think it's an issue with Optical in general but would like to hear what others think??