MPEG-2 playback audio syncing issue (works in Vista but not in OS X)

My setup:
- Mac Mini CoreDuo 1.83GHz, 1 GB RAM
- Elgato EyeTV 410 DVB-T
- Sony KDL-46W2000 FullHD LCD-TV (1920x1080p)
I have a rather complicated problem with audio-video synchronization at MPEG-2 playback. I've spent a lot of hours on troubleshooting in the last weeks without coming up with a solution.
I've installed Vista using Bootcamp on my Mac Mini, and in Vista everything works fine, so it's definitely a problem in OS X and not a hardware issue.
I have a Mac Mini CoreDuo 1.83GHz 1GB RAM. I have done a reinstall of OS X and updated it in Software Update until Software update says my "computer is up to date". So it's completely fresh without any third party software.
As display I'm using my brand new Sony KDL-46W2000 FullHD LCD-TV connected via a DVI-HDMI cable. I don't have to do any custom settings for this display. OS X outputs 1920x1080 progressive without me having to do any additional settings.
The issue is that when I watch DVDs the picture is delayed on the screen about 200 millisec compared to the audio. This isn't the case on all DVDs, but on several DVDs that I've tested. I don't know the differences between the DVDs. It's the same problem if I use VLC to playback so it's not just Apple DVD Player. And it doesn't matter if I use the S/PDIF output to let my receiver decode the audio or if I use the internal speaker in my Mac Mini.
Now to the most interesting part...
In addition to DVD playback problem, I experience the exact same problem with Elgato's EyeTV. But ONLY when using their deinterlace method "Progressive scan". If I use "Always" or "Motion-adaptive" the audio and video syncs just fine.
If I playback other media-files (in Quicktime or VLC) like mov, H264/x264 or XviD everything works just fine and as expected.
As far as I can see the problem only seems to affect MPEG-2 playback. And judging on the troubleshooting with EyeTV deinterlacing and/or progressive scan seems to be involved in some way.
I also tested EyeTV on a PowerBook G4 connected to my TV, and it shows the exakt same problem.

I don't know what causing the problem, but if you play the files with VLC you can adjust the audio synchronization in its "Audio" preferences if you check the "Advanced" box at the bottom-left.

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Message was edited by: SDMacuser

MPEG-2 playback audio syncing issue (works in Vista but not in OS X)

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