Originally Posted by DSperber
In other words... I'm confused. Something seems very inconsistent here. Tonight I played recorded programs from my DVR through HDMI input (still with the +100 setting) and listened through HDMI-2 -> headphones, and there was NO LIP SYNC OF ANY KIND. It was perfect! But previously, with a setting of 0 it was also perfect through headphones (or so I thought)!! Furthermore, listening to 2-channel analog stereo audio through speakers (still with +100) also exhibits NO LIP SYNC, just as I believe it did when it was 0! And yet, last night when I was playing "Queen of Versailles" BluRay with DTS-HD MA audio, I absolutely had to change the setting from its original default of 0 all the way up to +100 in order to get the audio to eliminate the lip-sync I heard through HDMI-2 and headphones.
I don't understand why I don't have any "induced lip-sync" resulting from my change from 0 to +100, on sources that previously had no lip-sync problem. Why is EVERYTHING now seemingly working perfectly audio-wise with +100, both analog and HDMI-2 digital, no matter what the source?
I'm very confused.
Well, I guess I have to reverse my position on this feeling that my DVR (i.e. external HDMI input) audio is mysteriously unaffected by changing the A/V Sync option from 0 to +100 as I had to do when watching the "Queen of Versailles" BluRay a few weeks back.
Today, I watched the multi-person in-studio ESPN announcer interview with Andy Murray after he won Wimbledon. With everything almost motionless except for their mouths moving, it was seemingly a perfect test situation for trying to decide if at the current +100 I really didn't have a lip-sync problem for this source, or did I (since I'd not had one when it was at 0, so how could I not have "induced" one by going to +100?).
Well, now I couldn't help but notice that there really was an apparent slight lip-sync problem. Slight, but I was annoyed by it, and of course the more I looked and listened the more it bothered me. Kind of like the one dead pixel on your panel or computer monitor, which over time you can't help but notice more and more as if it were the size of a saucer.
Anyway, I decided to set A/V Sync back to 0 just to see if that cleared up what I was seeing/hearing, and sure enough it did. There's now absolutely no question that with this particular test situation on my screen and coming though my speakers, that 0 does indeed give me sight/sound "perfection" again (i.e. no lip-sync discrepancy) whereas that the original +100 definitely did.
So, I now know that I simply need to be aware that lip-sync is possible, depending on the source (including not just external HDMI input but also from a native shiny BluRay disc movie). And one setting for A/V Sync should not be considered hard-and-fast. Rather, it is a control that is now available to correct a problem that might exist... for some sources, but not necessarily for all sources. And there's nothing wrong with adjusting A/V Sync as necessary, depending on the unique situation.
In particular, for me and my DVR/HDTV watching, it now appears 0 was (and is) the right setting for today's program content. Having it at +100 definitely "induced" a small artificial lip-sync symptom that really wasn't there in the first place, i.e. when watching with it set at 0.