Originally Posted by rckrz6
So ive had my 65KS8500 (AA02) for about a month now and i noticed that the audio sync was very slightly delayed from the picture using my cable box. (lips not matching up perfectly) This is using the TV speakers, my surround sound is perfect. The cable box is outputting 1080i with dolby digital. I confirmed this by playing the same channel on my sony set which has the same input delay. There was a small echo with the samsung set audio behind so my gut feeling was correct. i started playing with audio settings on the TV and found hdmi audio format is set to bitstream (which allows the TV to decode Dolby digital) I switch it to PCM and the picture went black and the cable box handshake with the TV and the sync is perfect now and matches the Sony TV in the other room (no echo). I switch back to bitstream and the same issue occurs. It is beyond me why the audio does not match up with the picture perfectly a using dolby digital signal but does perfectly with a pcm audio signal did samsung overlook this? Other then that the set is great. I had to exhange my first set because of 2 stuck red pixels and panel seperation. It does have some clouding in the lower right corner but its only visiable with HDR content where the backlight is cranked up very high
So I have a lip sync issues with my TV as well, but mine involves my surround system.
I have an Denon 1612 which doesn't pass through 4K/HDR, so I connect my PS4 directly to the TV and then pass the audio back to the receiver through ARC. When I set the audio to bitstream I get a delay in my speakers, so the audio is LATE. Note that I have set the audio delay to 0 on the TV and 0 on the receiver, yet the surround audio still behind the display.
1) This only happens in GAME mode, which makes me suspect that the TV's bitstream audio processing is not accounting for the reduced lag in GAME mode.
2) Using TOSLINK optical audio from the TV to the reciever instead of ARC DOES NOT solve the sync issue.
3) The issue DOES NOT happen with PCM audio.
4) The issue DOES NOT happen if I directly connect the PS4 audio to the receiver (video still routed directly to the TV), which means the TV is introducing some kind of audio processing lag.
I can only assume that the TV has a slight delay processing bitstream/dolby and it becomes noticeable when GAME mode is activated due to the reduced image lag. For now I've bypassed the TV and sent the audio directly to the receiver. Now the audio and video sync perfectly.
For me this is not a huge issue, but I wanted to pass it along in case anyone else could benefit from my observations/testing.