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Go Back   Blu-ray Forum > Displays > Display Theory and Discussion > New Display Technologies


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Old 03-12-2019, 04:11 PM   #1
CDexWard CDexWard is offline
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Mar 2018
Default LG OLED A/V sync issues

I recently picked up a LG B8 TV. It is my first new television since I bought an LCD 11 years ago and I am more than satisfied with the picture quality and the OLED black levels and colors but the sound options are really bugging me.

I connected a Samsung HW M360 soundbar via optical cable to the television and played around with the A/V sync option that allows you to delay the sound a little bit so it syncs up better with the video. Since I got the TV I readjusted this setting during every single movie I watched and I can't seem to get it perfectly right. Everytime I think I got it right it seems off again on the next movie I watch. Sometimes the vast majority of a movie seems to be synced but a few lines every now and then seem out of sync. I don't know wether this is more of a psychological issue. The option is there, so I have to use it. That is probably what I am thinking. But everytime I turn the feature off and on again I am under the impression that the audio is synced better with the feature turned on.

Anyway, the value of delay I always seem to default on is 2. But even when it seems right on most movies, sometimes is seems to be very wrong. I am currently watching the original Star Trek series and on the disc I am currently at 3 episodes seem right and one episodes seems wrong (The Galileo Seven-episode). This is driving me absolutely nuts. I just want to find "the setting" and be done with it. Does anyone have experience with the a/v sync option? What value did you set it to?
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Old 03-12-2019, 04:29 PM   #2
oddbox83 oddbox83 is offline
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You mention Star Trek. Old shows and films with post-production dubbing can have very variable lip sync anyway, you'll be ripping your hair out trying to get perfect sync with some material as it's impossible.

Have you tried Bluetooth mode to see if that makes any difference?

If it's psychological, perhaps a new soundbar with HDMI might be better as it should automatically sync correctly. Just make sure you get a compatible one, my B8 refuses to talk properly to my Denon AVR.
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Old 03-12-2019, 06:39 PM   #3
CDexWard CDexWard is offline
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Quote:
Originally Posted by oddbox83 View Post
You mention Star Trek. Old shows and films with post-production dubbing can have very variable lip sync anyway, you'll be ripping your hair out trying to get perfect sync with some material as it's impossible.
Well, that's a problem since 99% of the movies I watch are old.


Quote:
Originally Posted by oddbox83 View Post
Have you tried Bluetooth mode to see if that makes any difference?
Yes, Bluetooth delays the audio significantly which seems to be unfixable.

Buying a new soundbar is out of the question. That would mean I wasted 180€. And I don't know if it would even help. I have a Sony UBP 500X player connected to the TV via HDMI and the sound of the TV speakers is also off. If I delay the audio on my soundbar by 25ms it is perfectly synchronized with the internal speaker but the sound plays too early anyway, at least in my subjective view, I just have to find the perfect sync value in the TV's menu.
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Old 03-12-2019, 10:25 PM   #4
oddbox83 oddbox83 is offline
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I'd start looking at the player then. Have you checked the settings in there?
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Old 03-15-2019, 11:45 AM   #5
CDexWard CDexWard is offline
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Quote:
Originally Posted by oddbox83 View Post
I'd start looking at the player then. Have you checked the settings in there?
Thanks for the hint. I took a look at it's setting and changed surround output from Dolby Surround to Stereo since soundbars are stereo anyway. I don't know if that could possibly have done the trick but I watched half a dozen movies since I changed that and the sound seems almost perfect with the a/v sync option turned off. The only time I noticed slight lipsync issues was on the Dolby Atmos track of a UHD disc.

But maybe this is just a psychological solution to a psychological problem, who knows?
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Old 03-15-2019, 12:43 PM   #6
oddbox83 oddbox83 is offline
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No, sounds plausible that was it. With these AV chains it can be any one part causing the issue, if you downmix at source level (the player) that might be bypassing whatever was causing it.

You shouldn't have any Atmos issues, since the Atmos metadata is totally ignored by non-Atmos equipment and will be stripped away anyway in a stereo downmix.
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