audio sync issues with different DVBT channels?

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floydie

474 posts

Ultimate Geek

#125696 16-Jul-2013 16:49

i have my UHF aerial hooked straight into my samsung LCD, which then sends audio via optical to my Onkyo receiver. the audio offset seems different between the channels (especially prime)compared to say TV2 for example..
anyone else have this issue?
my uhf aerial is pretty an old sky UHF with not many focus x things on it. but runs in via RG6 to the tv.

sbiddle

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#857503 16-Jul-2013 16:50

It's probably the AC3 vs AAC issue all over again.

Samsung TV's used to be horrible with Freeview and for a number of years had no ability to select between AC3 and AAC audio.

B1GGLZ

1961 posts

Uber Geek

#857595 16-Jul-2013 18:49

Try using speaker sound on the TV and see if there is a sync issue. I bet there won't be.
If there's not then there must be a problem with the amp.
Only time I ever get sync issues is when they get a news feed via internet and hav a sync problem with the feed.
I fail to see why you think the antenna may be involved?

floydie

474 posts

Ultimate Geek

#857605 16-Jul-2013 19:03

but its between channels. I.E tv2 will be ok but switch to something else and its slightly out of sync. enough to be annoying

sbiddle

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#857619 16-Jul-2013 19:18

floydie: but its between channels. I.E tv2 will be ok but switch to something else and its slightly out of sync. enough to be annoying

What audio feed are you using, AAC or AC3?

floydie

474 posts

Ultimate Geek

#857895 17-Jul-2013 09:21

the spdif out put is selected tp PCM, it has the option of dolby digital but i cannnot select it.
the only audio output option i can see on the TV is "HE-AAC 2.0".there were two other options but i couldnt select them either.(and now i cant even find them in the menu)

i may do a factory default reset on the onkyo and reprogramme it and see if it makes any difference.
also would a firmware update on the TV make any difference??

hdinsider

552 posts

Ultimate Geek

#857943 17-Jul-2013 10:42

Definitely do a firmware update. I've seen this fix lip sync problems before.

I've looked into the lip sync a fair bit and from my own experience tv 1 and 2 seem to have audio a few frames behind vision. This normally looks ok and can make up for the display delay in a tv if you have a laggy LCD or take your audio directly to an amp.

Tv3 and 4 seem in sync, but if you have any video delay in your system (like above) it looks out of sync because even a small one frame lead in the audio is really unnatural.

Tvnz U music clips are way out of sync, but the U-live presenters are in sync... Don't know what's up there.

Prime seems to vary day to day. Some days it's several frames out of sync, particularly on Letterman.

don't mess with me.... i'm the hd insider....