AirTunes to Apple TV is slightly out of sync with other AirTunes devices

I've noticed that AirTunes playback through Apple TV is slightly out of sync with the audio output from my Macbook and the AirTunes via my two Airport Express Base Stations. The audio from Apple TV is about a second delayed, causing a mismatch between AirTunes playback on the TV and my Macbook and other AirTunes devices. Thus, my Macbook and AEBSs are in harmony, but Apple TV's AirTunes is about a half-a-beat delayed.
Has anyone else noticed this problem or know of a way to remedy it?

This is quite intriguing. I would expect that an amplifier would be able to decode the digital signal with no noticeable delay, otherwise DVDs etc would play with audio out of sync when using the digital output of the player. In fact, rather the opposite is true with new larger screens where it is the video that's slow and the audio needs to be delayed.
So this would point to the Apple TV's digital output being delayed vs. it's analogue output and I'm not too sure I understand why. It receives digital information over the network and then takes longer converting that to SPDIF (its digital output format) than it does converting it to analogue. Odd.
Perhaps an expert can advise us on this.
This would however explain why the Airport Express can exhibit the same problem and why some people don't experience any delay - they are probably using the analogue output of their Apple device.
What we need in iTunes when selecting devices to play from is an additional control for each with a +- setting that can adjust the delay of each output device so they can all be brought in sync. Since the delay appears to remain consistent that ought to solve the problem for everyone once and for all.
I'll try some tests of my own and see if my problem is indeed this digital delay.

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I tested this single angle idea by using the footage in a nother project and exporting part of that (without changing angles) and it seemed to be OK. However I have other projects which are only single angle but they export slightly out of sync as well. I haven't found a common denominator yet.
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Thank you very much for your careful responses. Here are the answers to the questions.
First of all, the "slow video" behavior does appear only after adding the slides mentioned in previous post.
1.    I created a “software simulation” project. It IS a capture+audio recording.
2.    Since I recorded the audio while doing screen capture, almost every slide has audio, which is not convenient to edit at all. Is there any other better way that I missed so that we can keep the audio and video at the same step while editing them? As I know so far, either insert silence or delete a little audio to one slide, the audio becomes short, but the slide duration time is still the same as before unless we change that manually which normally is not precise enough to match the audio.
3.    I tried to add the blank slides at where there is a pause of speaking and where they are close to the problem slides. Otherwise, the speaking would sound weird.
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5.    I do have two externalized video files for title and end.
6.    Unfortunately, it is still slow even if it played on a different system.
And another problem comes up these days. After publication, the screen resolution is not good (like some grey ink left on screen) wherever click or type something. It did not happen before even if worked on the same computer.
I am very sorry that there are so many problems. I have been working on this for long time. The project totally drove me nuts. Hopefully you have more ideas about that.
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