[Lezziter]

I recently built a new HTPC based around Intel Haswell, but with an external GPU for more gaming horsepower. Unfortunately, the new hardware aslo introduced this pesky 24p sync issue - something I didn't have with my old A10-5800K IGP solution.

Relevant components are a Pentium G3220 on an Asrock B85 based motherboard. The setup is connected to a Panasonic ST50 via a Yamaha RX-V467 receiver. Right now I'm using optical S/PDIF for sound and the reciever "only" for switching, but I have confirmed that the behaviour is identical with HDMI.

I'm working as a hardware reviewer and can therefore try different hardware options by using things from the office. In an effort to solve the 24p issues, I have tried quite a few configurations and settings over the past weeks. Unfortunately, nothing seems to help all the way.

* AMD Radeon HD 7770 (1st gen GCN)
* AMD Radeon HD 7790 (2nd gen GCN)
* Nvidia Geforce GTX 650 (Kepler)
* Nvidia Geforce GTX 750 Ti (Maxwell)
* Integrated Intel HD Graphics (Gen7+/Haswell) (side not: the Intel GFX Control panel is useless)

I have also tried with software decoding, software rendering and different scaling options in various combinations. With every setup, I still get 175-200 ms of video delay. The temporary solution is with advancedsettings, but as others have reported it still feels like someting is "off". When watching 25p material in 50 Hz or using 60 Hz with pulldown the sync is perfect.

And interesting side note is that I'm using Lightpack with Prismatik for ambient lighting. In some situations, especially quick flashes of light, it's clear that the ambilight actually reacts _before_ the video on my tv. It's like the capture software is ahead and in sync with the audio rather then with the video stream. Just to clarify, I have of course done all real 24p testing with Lightpack disconnected. It's quite CPU heavy and can surely add some strange behaviour on it's own.

I guess my post won't really change anything, but here you are anyway.

If a specific advanced settings for 23-24 hz movies solve your problem why don't you use it ?

I do use it, but it doesn't solve the problem. As I said, there is still something that feels "off", even if it's miles better than without any audio delay at all. I guess that is because the offset isn't constant but varies slightly, from about 175 ms to 225 ms. Setting the parameter in advancedsettings to about 175-200 ms is a good start, but it isn't as good as "real sync".