Audio sync problems when screen set to 24 Hz (3 Viewers)

[onyx666]

i opened a thread to see which type of card has most problems with 24p (ati or nvidia)

Can people with working/not working 24p please respond to this thread ?

https://forum.team-mediaportal.com/video-cards-334/ati-nvidia-24p-69514/?highlight=24p

 

[anvandarnamn]

Ok i have managed to make my setup work and i now have no problems with audio sync and Dynamic refresh rate is working perfectly.

- I updated my Nvidia Geforce 8 Series drivers to the latest version (I had a very old version)
- I installed FFDShow Tryouts ffdshow tryouts project: Discussion & Development - Doom9's Forum
- I used FFDShow codec for H.264 decoding
- I used FFDShow audio codec for Audio Decoding
- I am using WinXP with VMR9

I believe the use of the FFDShow for both my video and audio decoding was the source of my resolution.

Thank you all.

VMR9 has never given me any syncproblems.
it's EVR and Mediaportal that is a NO GO....

 

[pannivas]

Ok i have managed to make my setup work and i now have no problems with audio sync and Dynamic refresh rate is working perfectly.

- I updated my Nvidia Geforce 8 Series drivers to the latest version (I had a very old version)
- I installed FFDShow Tryouts ffdshow tryouts project: Discussion & Development - Doom9's Forum
- I used FFDShow codec for H.264 decoding
- I used FFDShow audio codec for Audio Decoding
- I am using WinXP with VMR9

I believe the use of the FFDShow for both my video and audio decoding was the source of my resolution.

Thank you all.

VMR9 has never given me any syncproblems.
it's EVR and Mediaportal that is a NO GO....

I will test that as well.

Is EVR with XP or Vista or both that gives you trouble?

 

[rekenaar]

Is EVR with XP or Vista or both that gives you trouble?

Recommended settings:
Under Windows XP - Use VMR9 only and exclusive DirectX mode
Under Vista - Use EVR and enable AERO

 

[Seeco]

I have had these kind of troubles before, even with a setup pretty similar to the one I have now. Anyway, at the moment the problem seems to have gone! I am running the latest MP beta, Latest beta of SAF codec package and AC3Filter for audio. This gives me consistently delayed sound in all HD material, but that can be fixed with AC3Filter:s delay setting. I use VMR9 as renderer. Hardware is a C2D E6550, 4GB RAM, ATI Radeon HD4870, Pioneer 5080XA TV.

 

[pannivas]

I have had these kind of troubles before, even with a setup pretty similar to the one I have now. Anyway, at the moment the problem seems to have gone! I am running the latest MP beta, Latest beta of SAF codec package and AC3Filter for audio. This gives me consistently delayed sound in all HD material, but that can be fixed with AC3Filter:s delay setting. I use VMR9 as renderer. Hardware is a C2D E6550, 4GB RAM, ATI Radeon HD4870, Pioneer 5080XA TV.

Did you try FFDShow for both audio and video on HD material?

That seemed to fix the problem for me at least.

 

[Scythe42]

Is EVR with XP or Vista or both that gives you trouble?

Recommended settings:
Under Windows XP - Use VMR9 only and exclusive DirectX mode
Under Vista - Use EVR and enable AERO

EVR in Vista = drifting audio when playing back x264 24p material and display is set to 24p and using SPDIF passthru. Set to 60Hz, no drift with the same settings. Looks like a defect in the internal player to me in regards to the framerate it sends to EVR and EVR defaults to 60Hz because of that which results in drifting audio and some minor video issue that prevent smooth playback.

VMR in Vista = audio does not drift, playback is smooth.

I'm using Vista x64, NVidia 9300, audio and video over HDMI. Machine never uses more than 10-15% CPU. So it's not a processing power issues. Issue is there regardless of the used codecs and driver versions. 100% reproducible with MP 1.0.2 and also the latest 1.1.0 beta on my end. Other players do not show this problem.

 

[technick]

Hi, I made a howto for Nvidia owners, see my post : https://forum.team-mediaportal.com/...-1-1-0-beta-1-windows-vista-70107/#post505933 I don't have anymore sync probem, it can help you ;-)

 

[Scythe42]

I don't have anymore sync probem, it can help you ;-)

Basically just some different codecs. Gave them a try though: same issue. Audio will drift over time for x264 content and SPDIF passthru over a HDMI connection when 23.976Hz or 24Hz is selected (method of selection doesn't make a difference). Some files are worse than others though for yet unknown reasons.

I also did a trial with Win 7 RTM: The EVR renderer behaves at 24p very similar to VMR under Vista. Meaning that audio will not drift over time. At least not with a test movie I can reproduce the behavior under Vista right away. There is a fixed delay (roughly 50ms on my rig) though under Win 7, that doesn't happen at 60Hz. Skipping forwards and backwards also behaves like VMR under Vista.

So the 24p bug in MP behaves a little bit different in Win 7. Or whatever MP does wrong, Win 7 compensates for it. I still think the EVR presenter sends some wrong refresh rate or vsync information out. In Win7 there are some vsync related issues that are not present under Vista.

I haven't checked the details with GraphStudio yet. Also I need to check more files if this isn't just a coincidence and just my selected test movie worked here. Therefore I'm careful with my final verdict... I probably do some extended tests on the weekend.

 

[tourettes]

Basically just some different codecs. Gave them a try though: same issue. Audio will drift over time for x264 content and SPDIF passthru over a HDMI connection when 23.976Hz or 24Hz is selected (method of selection doesn't make a difference). Some files are worse than others though for yet unknown reasons.

Odd, as when the bug would be in the EVR presenter it should be as buggy on all files. So, there should be some external dependancy as well that causes the issue to appear.

I also did a trial with Win 7 RTM: The EVR renderer behaves at 24p very similar to VMR under Vista. Meaning that audio will not drift over time. At least not with a test movie I can reproduce the behavior under Vista right away. There is a fixed delay (roughly 50ms on my rig) though under Win 7, that doesn't happen at 60Hz. Skipping forwards and backwards also behaves like VMR under Vista.

Have you tested the analog audio output?

So the 24p bug in MP behaves a little bit different in Win 7. Or whatever MP does wrong, Win 7 compensates for it. I still think the EVR presenter sends some wrong refresh rate or vsync information out. In Win7 there are some vsync related issues that are not present under Vista.

EVR presenter is not responsible to send the refresh rate signal to any other component, so at least it cannot be that what causes the issue.

V-sync is driven by the display drivers, EVR presenter cannot change that. There could be a bug in the code that fails to schedule the samples to be displayed, but I still haven't figured out how such could affect the audio / video sync.