DVDs out of sync ?

jcf

Hi

If a DVD film is slightly out of sync sometimes, is this a
1. DVD player issue ?
2. DVD disc ?
3. TV it's connected to and how that deals with the sound (I doubt this one!)


However some films play fine some(mostly older) ones are a little out of
sync in parts , so i suspect it's just the way the films were mastered, dunno.

What usually causes out of sync issues ? I have a Panasonic DVD player
its a good player, and a Sony LCD TV which is good too.

Cheers for any info.

Lump

Is it going through any kind of VHS/DVD recorder, or direct to the tv?

John

jcf

no, direct to the TV

Lump

That's an odd one then. No idea really.

John

pH

Because panel TVs need to digitise and de-interlace the picture this can result in a small amount of time and lead to audio sync issues. However if the speakers being used are on the TV then normally they have been adjusted to accomodate the known delay.

This processing would be common to all inputs, so if you get no sync problems on live TV or on a VCR then it looks like the DVD player is at fault. Check the menus for any audio sync options and see if you can get a solution that you're happy with.

Idleater

If you were going to use an external sound processor (eg home cinema amp) these now come with a delay feature that will do exactly that with the sound channels giving the LCD time to process the picture.

Happens with all the LCD/Plasma tvs exactly as PH has explained. Not sure about DLP, but CRT does not have as pronounced/visible issues.

Goolgle "Lip sync LCD" and you will get plenty of information...

L.

Sparky

there is a slight delay on sound on my dvdplayer to the cinema amp, but its so little that you only notice it if you turn the tv speakers on and you hear a light delay like a surround effect.
Ive seen serious delay where youd think it was dubbed, but not on my tv thankfully.

jcf

Strange thing is some films are fine, never out of sync
but one in particular has one scene thats way off, so i was thinking it must be the disc, they way it was mastered (ao all of em would be like that).
But when i played the same scene in my laptop it was fine!!

I can't understand why some scene would be out but the rest are ok,
I mean if it is this LCD Lip sync thing, then surely the whole disc
would be off ?

Idleater

jcf wrote:

I can't understand why some scene would be out but the rest are ok,
I mean if it is this LCD Lip sync thing, then surely the whole disc
would be off ?

It could be down to what processing the screen has to do? I mean dont LCD's only refresh what is different rather than constantly refreshing the entire screen?

L.

jcf

yeah maybe so when there is a scene with a lot new going on,
then it lags a bit yeah ?

jcf

I see you can get audio delays and attach them to the amp ?

But this would not work if the time of the actual delay varied would it ?

I also see some LCDs have an audio analyser built into them to prevent
this problem, wish i knew about that before !

John R

If it's only happening on certain discs and not with live TV or other sources then it's not the LCD that's at fault.

I have a DVD player that is always drifting out of sync, a quick pause-play returns it to normal. The discs I have are all home-recorded but they play fine on other players.