[frarev]

@frarev:

I talked with bob. Playing 23.976 fps content at a perfect 23.9756 refreshrate will work perfect, as the clocks match and nothing needs to be dropped / duped. If you play 23.976 fps content at 24.0 hz you have a big problem when passthroughin cause that will get you a whole lot of drops and dupes. I would not use passthrough in that case, then you could resample audio. If you really need passthrough - then you have to set the Method to Audio Clock.

Users where the GPU cannot do correct 23.976 fps, have a big problem, cause the clocks will always differ. I can only suggest to not use passthrough in that case, if you want both perfect smooth picture and no drops / dupes in audio.

You can verify what your TV is really doing by running xbmc-xrandr and check the output. Most TVs display 24 for both the 23.976 and 24 hz mode.

Well, it seems that Video clock Drop/Dupe audio Is the best option for me for 23.something Fps. I have a perfect smooth video play and audio is OK.

This is few lines of my OpenElec Frodo logs :
- CVideoReferenceClock: Clock speed 100.100000% : so the option works if I quite understand Fritsch's explanation
- Every 30s (approx) i have CDVDPlayerAudio:: Skipping 1 packet(s) of 32.00 ms duration
- I have Audiophile switch enabled
- i have RAW passthrough enabled

But for other Fps like 25fps or 29.970 Fps it's horrible. Big stuttering. Bad we can't activate or not the option according fps with AdvancedSettings.xml for instance.

Anyway, thanks for explanations that help to understand how XBMC options work.

Audiophile switch is not existent in gotham anymore, it does nothing. When you play 25 fps content at 50 hz all is fine. When you play 29.970 at 60 hz it gets problematic, cause the syncer must do a lot more. If your TV really cannot do 23.976 fps, I would disable that settings, when you want to use passthrough. It will be perfect when you disable passthrough and choose audio resample. Only disadvantage: DTS-HD Master is not decoded, but only the core. If you have a 5.1 setup you might perhaps even not realize it. Other advantages: You will be able to control your volume again with the xbmcs internal volume. You loose absolutely nothing quality wise (despite with DTS-HD) when doing that. You even win a lot: No more drops / dups in audio. Perfect audio + video.

You won't see the DTS-HD Master / Dolby / DTS / etc. Icon on your AVR anymore. If that bothers you, put a bit of paper infront of it :-)

First, I'm using XBMC frodo OpenElec 3.2.4, not gotham yet. I guess the explanations are the same but perharps results will be different because I read Gotham has a new audio/video engine.
My Nuc i5 is connected (audio and video) with mini-hdmi to my Yamaha A3020 Receiver, that is connected to my Pioneer Plasma.

Now, I disabled Audiophile switch.

I tested Disable Passtrough and tried the option Video clock (resamble audio) : this give awfull results
23,976 fps : video smooth, sound horrible.
25 and 29,97 fps : sound OK but video with heavy stuttering (not watchable).

So I get confused about your explanations.

I tryed Audio clock :
23,976 fps : video quite perfect (few very small stuttering)
25 and 29,97 fps : sound OK but video with heavy stuttering (not watchable).

The best configuration for me is Adjust display refresh rate to match video ON and NOT activate Sync playback to display (OFF).
I disabled as well VDPAU and XVBA hardware acceleration cause there are not useful on Intel NUC : only VAAPI is OK for Intel HD Graphics.
All 23,976, 25 and 29,97 fps video are smooth and audio is passthrough decoded by my A/V even DTS-HD Master. It seems that the small stuttering I usually get in some well know movies are gone since I deactivated Audiophile switch. I will see if I get some in my next watch.

So thanks for explanations that help me to choose the best configuration for now.