Is there a way to set audio delay in Myth? This would help audio/video sync for HDTVs that process the video frames and therefore actually play back video a few milliseconds late?

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Currently running: R5.5, HD5000 x 2, PVR150, Athlon 64 3000+, Chaintech VNF4, 1GB RAM, 2 x 250GB in LVM, MSI NX6200TC -> AA 9A60 -> HDTV

Yes. Burrow down into the setup menus in the front end. The path is roughly: utlities/setup -> setup -> tv -> playback There are a could audio sync options in there...

I've searched through the playback settings as you recommend. I found "use video as timebase" and "extra audio buffering". However, I can not find any sync options that can help me. Is there another location that I should investigate? A clue or perhaps some specific search terms would be appreciated. I have found many posts regarding sync, but most are targeted to fix a problem within Myth. My problem is not Myth, rather I'm trying to tweak Myth to account for HDTV processing video & audio inside the TV.

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R5.5; PVR-250; FX5200; Dell 4300 with Intel Pentium 4 (1.5 GHz);
BIOS Revision A02; 512MB RAM; 500GB PATA HDD

I still haven't found these permanent audio sync options.

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Currently running: R5.5, HD5000 x 2, PVR150, Athlon 64 3000+, Chaintech VNF4, 1GB RAM, 2 x 250GB in LVM, MSI NX6200TC -> AA 9A60 -> HDTV