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Message: <blockquote data-quote="Scythe42" data-source="post: 507321" data-attributes="member: 95833">I try to take a look at the code if I see something. I play around with it a bit. But I'm not very fluent in D3D. Guess I need to visit MSDN first for a crash course. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin    :D" loading="lazy" data-shortname=":D" />Anyway below is the EVR debug log from a playback. Maybe it gives you some ideas.I started playback of movie with  AVC video and AC3 audio this time. I resumed where I last left off. Horrible out of sync and slowly started to drift even more. I paused the movie and resumed, no difference. I then skipped back a little to get it in sync again. It was still a bit off and slowly drifted out of sync again for about the next 60-90 seconds. Then there were two judders. The first one was maybe just a few frames long and afterwards audio didn't seem to drift further. The second judder a few seconds later was way longer and skipped a lot of frames (including audio). After the larger one the audio was nearly back in sync (probably off due to processing, but anything that's constant I can compensate) and didn't drift any further. There were a few dropped frames about every 30 seconds from now on. Processor usage was between 5% and 10% all the time. With VMR way more processor usage but no skipped frames and everything in sync except for a constant processing delay.This is bit unusual than most times because of the large resync attempt after which the drifting stops. Usually there are a few subtle attempts for resync without any judder (probably just one frame) that reset the audio drift very little but it continues to drift again right way. In this cases the playback starts in sync before drifting.One thing I also observe is that with 60Hz, there are a lot of skipped frames in the beginning right after playback trying to get everything into sync while audio is running. Looks like the first second of video playback time is accelerated. With 24Hz there is a pause at the beginning. All frames are skipped until playback starts. Audio comes in a little bit earlier. Same happens when skipping forwards and backwards which is basically starting playback at another position.</blockquote>

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