Originally Posted by christop43
Does the RX-V3800 have any problems with sound delay? I just returned a Onkyo 805 to Amazon because of lip sync issues. I just read this entire thread and didn't notice anyone having this problem with the RX-V3800 but figured I would ask.
Lip-sync problems are usually minor and depend on the program. Nominally, the cause is that video processing takes longer than audio, so audio lags video. However, the entire digital architecture where A/V sync problems are even allowed
to arise is a bug. The need for A/V sync should have been anticipated and lip sync problems prevented by design.
HDMI 1.3 allows the TV to communicate delays to the A/V receiver and supposedly correct lip sync automatically. Maybe this works (RX-V3800 implements auto lip-sync) but the whole process depends on the TV, and most TVs don't do auto lip-sync (yet).
Besides, the entire industry has a fundamentally flawed approach, where A/V sync is a house of cards with numerous pieces of equipment between the live event and your playback equipment making their own adjustments based on expectation of delays present somewhere else. TV stations make adjustments, satellite receivers do, A/V receivers have them, and at the end of this entire chain, the viewer is left with an uneasy feeling of unreality because lip sync is wrong -- but very difficult to detect and adjust by eye/ear alone.
So, what is to be done? I gave up on 2007. It may be a decade before the industry provides a functional method to guarantee that the viewer sees and hears synchronized picture and sound based on timing markers recorded during the live event. This situation is infuriating and has no engineering justification. The problem is political: Fragmented nature of signal processing and lack of implementation even for existing standards, e.g. HDMI 1.3 auto lip-sync.
BTW, in absence of an auto lip-sync capable TV, Yamaha's manual lip-sync adjustment is totally brain dead: To adjust it, you need to go to a GUI which takes 5-10 seconds to appear, and replaces
the video -- so there is no way to see the effect of changes until you get out of the GUI, which takes another 5-10 seconds. Who thought that up?