Morning folks I've been playing around for a while now to try and get audio and video synched right for DVD playback and Im not having an awful lot of luck. Hardware spec: HTPC Athlon XP 1700+ 384Mb PC133 MSI KM266 mATX mobo (thats an old via chipset but with a USB2 south bridge) , internal audio and legacy ports all disabled Laptop hdd drive and dvd drive as theyre extremely quiet! Radeon 9000 non pro inno3d audio extreme 5.1 for optical spdif pass thru nebula digitv Software: WinXP all patched up Sonic Cineplayer PowerDVD5 Reclock AC3Filter Zoomplayer Both AC3 via passthru and analogue are out of synch for DVD playback using any combination of filters/renderers in Zoomplayer. Some DVDs are worse than others, but have yet to find a pattern. Pausing and restarting doesnt help. Last night I took apart my main PC to see if moving to Intel might help. Spec: p4 1.6a abit bd7-II (i845 chipset), all legacy ports turned off PCI Latency set to 0 (read somewhere it might help) 512Mb DDR radeon 9000 inno3d audio extreme or aureal 3d soundcard (doesnt work in the Via chipset mobo) Still having problems having moved to Intel - it is better, and more consistant, but still not perfect. Some of my DVDs on this hardware are perfect, so adding an audio delay in ac3filter only makes it wrong for the ones that are working DVDs! Is it just that the producers of DVDs are at fault here in being too lazy to do things properly, or is there some magic wand I can wave at this to make my sych probs go away? In particular looking at PAL Blade2, the synch was out enough to be really irritating. Any ideas welcome!