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Old 02-24-10, 06:51 AM   #1
Rodercot
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Default Feature Set C GT220-GT240 24p VDPAU 1080p VC1 Playback

Hey All,

I am having an issue with unwatchable 24p playback within XBMC. I have been through my xorg.file to my eyes bleed. I have found a couple issues with my Denon rcvr which I have now fixed.

Anyone else with a AVR-988 - Turn of your scaler, if forces Xrxndr to use interlaced modes and no 24Hz support.

My setup and I have tried this on multiple machines.

Asus p5n7a-vm - C2D 7400 - 4Gb Patriot 800 DDR2 6400 - Asus Gt200 1gb and GT240 1gb
Myth 9.10 - Avenard Repos have tried all 185-195 glx drivers here.
Currently 195.36.03 Beta driver.

The playback in 24p stutters to the point it is unwatchable - This is with VC1 files only. everything else that uses VDPAU is just fine.

I am asking to see if anyone is noticing this in any other players Mplayer etc.. to narrow this issue down. It is a pain to have to turn off vdpau rendering in XBMC when wanting to watch a VC1 file. At 60Hz with vdpau all VC1 videos play just fine.

Audio is never bad, I am using hdmi audio via the gt220 or gt240. and my on-board audio is disbabled as well as the on board gpu.

I do have an xbmc log on pastebin showing what I see when I try this playback but it is tailored to xbmc's use of vdpau, ffmpeg etc...

Any ideas would be great.

Thanks,

Dave

Last edited by Rodercot; 02-24-10 at 06:53 AM. Reason: spelling
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Old 04-06-10, 06:55 PM   #2
jamesb4
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Default Re: Feature Set C GT220-GT240 24p VDPAU 1080p VC1 Playback

I have exactly the same issue - did you find a fix for this?
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Old 04-07-10, 10:16 AM   #3
Stephen Warren
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Default Re: Feature Set C GT220-GT240 24p VDPAU 1080p VC1 Playback

Sorry I missed this thread before. Does this happen with every single VC-1 file, or just some? Either way, could you upload a sample file that demonstrates the problem to our NVIDIA's file drop (see sticky posts in this forum) and note here when it's available. Thanks.

You mentioned both XBMC and MythTV above. Does the problem happen in both? Can you please try MPlayer to see if the problem also happens there.

Finally, which version of XBMC do you have, and can you please supply an nvidia-bug-report (see sticky posts).

Thanks!
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Old 04-07-10, 05:39 PM   #4
jamesb4
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Default Re: Feature Set C GT220-GT240 24p VDPAU 1080p VC1 Playback

Two things to reproduce this;

- the VC1 files need to be 24/23.976 fps
- XBMC needs to be set to "Adjust display refresh rate to match video"

If either of those is not true then playback is normal.

Hmm - playback is fine in mplayer using VDPAU - even at 24 hz refresh rate - I'll open a bug with XBMC about this. Thanks for taking a look at the thread.

This is a sample file which causes problems.
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Old 04-08-10, 09:45 AM   #5
Stephen Warren
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Default Re: Feature Set C GT220-GT240 24p VDPAU 1080p VC1 Playback

It's possible that this entry from the README might be related to this; perhaps XBMC is getting confused re: which display modes have which refresh rates, and hence isn't actually selected a 24Hz display mode like it thinks it it?

If this turns out not to be relevant, then yes, having the XBMC team look at this first appears to make sense.


Q. Why is the refresh rate not reported correctly by utilities that use the
XRandR X extension (e.g., the GNOME "Screen Resolution Preferences" panel,
`xrandr -q`, etc)?

A. The XRandR X extension is not presently aware of multiple display devices
on a single X screen; it only sees the MetaMode bounding box, which may
contain one or more actual modes. This means that if multiple MetaModes
have the same bounding box, XRandR will not be able to distinguish between
them.

In order to support DynamicTwinView, the NVIDIA X driver must make each
MetaMode appear to be unique to XRandR. Presently, the NVIDIA X driver
accomplishes this by using the refresh rate as a unique identifier.

You can use `nvidia-settings -q RefreshRate` to query the actual refresh
rate on each display device.

This behavior can be disabled by setting the X configuration option
"DynamicTwinView" to FALSE.

For details, see Chapter 13.
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Old 04-08-10, 05:54 PM   #6
jamesb4
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Default Re: Feature Set C GT220-GT240 24p VDPAU 1080p VC1 Playback

Yeah, I've got Dynamic TwinView disabled and XBMC seems to pick the right refresh rate - it also uses nvidia-settings to query so it definitely seems to be doing the right thing in that respect.

XBMC bug here in case anyone else is interested: http://trac.xbmc.org/ticket/9059

Thanks!
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