Re: Video/Audio Not In Sync?

fOn Thu, 16 Feb 2006 04:22:24 GMT, "DanR" <dhr22@xxxxxxxxxxxxxx>
wrote:



MacMike wrote:
I had our HDTV home theater system installed a couple of weeks ago, and
love the picture quality of HDTV...can't believe what I've been missing!

But, I do have a major annoyance with our system....quite often, but
not all the time, the picture on our monitor isn't "quite" in sync with
the audio coming from our AV receiver. This only seems to happen in
HDTV mode...haven't seen it happen with SD channels. It's really
annoying...akin to watching a 1950's Japanese science fiction movie
dubbed in English.

We have the following equipment in our system:
Hitachi 42HDS52 Plasma
Onkyo TXSR503 AV Receiver
HDTV Source: Cox Digital Cable with HD-PVR set top box

Has anyone here seen this problem? Is it something I'll have to live
with, or is there something wrong with the equipment?

Thanks,

Mike

Not unusual at all. Many digital stations are having trouble implementing the
5.1 surround sound and out of sync audio is often a problem. Check out
www.avsforum.com and find the thread for your city / area. You'll find lots of
discussion about these sync issues. (and others)

There is one effect that can not be blamed on the provider and that is
the fact that when we connect the sound to the audio amplifier and the
video to the monitor and the monitor performs image processing (for
example to convert between interlace and progressive or scaling the
resolution etc) the video will be delayed.

This is the reason why a good surround processor includes settings for
global delay of the sound (with 0-200ms as a common range).

Check your Onkyo for this feature (but I don't think it is included).

If the delay is more than say 0.1s or only occurs with some
programming and not related to a certain signal type (or if the video
comes first), it probably is another problem.

I notice once in awhile that also film editors makes mistakes with the
sound sync in certain scenes. The quality in this respect varies with
the source material and this variation tohether with a systematic
delay in your equipment might also explain that it is only some
meterial that crosses the "annoying threshold".

If you have a delay setting, the calibration DVD "Digital Video
Essentials" includes test signals that can help with the setting)
/Jan
.

Relevant Pages

  • Re: Route signals through receiver or hdtv first?
    ... | delay capability in the surround amplifier. ... If the video delay is over your acceptance ... but also the audio out connections? ... The 5.1 sound from external sources needs in many cases to be ...
    (alt.tv.tech.hdtv)
  • Re: DTV audio / vidio sync
    ... stay in sync. ... make delay adjustments differentially, any delay of some part of the A/V ...
    (sci.engr.television.broadcast)
  • Re: Route signals through receiver or hdtv first?
    ... | delay capability in the surround amplifier. ... If the video delay is over your acceptance ... but also the audio out connections? ... The 5.1 sound from external sources needs in many cases to be ...
    (alt.tv.tech.hdtv)
  • Re: Route signals through receiver or hdtv first?
    ... | delay capability in the surround amplifier. ... If the video delay is over your acceptance ... but also the audio out connections? ... The 5.1 sound from external sources needs in many cases to be ...
    (alt.tv.tech.hdtv)
  • Re: Fostex FR2 & Final Cut Pro
    ... The sound files need to be pulled down to match picture. ... One quick way of doing this is to use something like Sound Forge's batch conversion tools to restamp the SRs of the files. ... The students shoot film and have it transferred to video. ... The powers that be at the school now say that they need the timecode cards in the FR2's so they can pull down the files to stay in sync. ...
    (rec.arts.movies.production.sound)