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Old 10-21-09, 07:44 PM   #25
laffinet
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Default Re: VDPAU 9400GT MPEG2 artifacts

Gator,

I've noticed another issue while using the recent nvidia drivers (185 and above) and mythtv. I was wondering if you can check if you have the same effects.

Here's what's happening: If I run mythtv (watching TV) and open another program on top of that (say firefox), black areas in firefox seem to be transparen, showing the image from mythtv.

Have a look at this post where I attached a picture that shows this effect.

Are you able to reproduce this ? I'm running 8.10, ffmpeg for decoding and vdpau for rendering
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Old 10-22-09, 10:54 AM   #26
Stephen Warren
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Default Re: VDPAU 9400GT MPEG2 artifacts

That behaviour is expected; it's an artifact of color-keying. Depending on the application, you might be able to pick a different color key color (the presentation queue background color) and hence set it to something unlikely to show up in other applications.
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Old 10-22-09, 05:56 PM   #27
laffinet
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Default Re: VDPAU 9400GT MPEG2 artifacts

Thanks for the explanation.

If only I could get rid of those darn blocks when decoding mpeg2 with vdpau
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Old 11-08-09, 05:02 AM   #28
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Default Re: VDPAU 9400GT MPEG2 artifacts

Hi I also have a M2N68-VM but with a 9500GT and i get those same blocks as well.
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Old 12-18-09, 10:39 AM   #29
rdriscoll
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Default Re: VDPAU 9400GT MPEG2 artifacts

I'm running MythTv on a M2N-VM with an Asus 9400GT and get blocking during playback of any 1080i HDTV(OTA) recordings. Using the High Quality software playback profile all is well.

I did find this information on another post but haven't tried it yet:

"Just so people reading this know, the recent mythtv trunk has added an experimental filter option that let's you change the default buffers for vdpau. You can now add vdpaubuffersize=X to the filters section of the video display profile without having to edit the source and recompile. The default (as mentioned below) is 6, but setting to 32 seems to make most clips work fine with me"

One thing that I was wondering about is the increased power usage by the graphics card could be too much for my current power supply (it's only 300Watts) - it's a long shot but if the video RAM is not getting enough current...
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Old 12-18-09, 12:12 PM   #30
cehoyos
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Default Re: VDPAU 9400GT MPEG2 artifacts

Why doesn't MythTv use the actual number of required buffers as MPlayer does?
(VdpPictureInfoH264.num_ref_frames)

Carl Eugen
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Old 12-23-09, 10:01 PM   #31
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Exclamation Re: VDPAU 9400GT MPEG2 artifacts

4 people on this thread with the blocks ( mpeg2 decode with vdpau ) all have ASUS M2N68-VM motherboards. I was going to but another graphix card (Inno3d GT220) but i think a motherboard replacement might fix this issue. I will report back when i replace it.
Merry Xmas everyone.
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Old 12-24-09, 04:20 AM   #32
bts1000
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Default Re: VDPAU 9400GT MPEG2 artifacts

In my case, it's a ASRock 939N68PV-GLAN...
NVIDIA GeForce 7050PV / nForce 630a / NVIDIA nForce 630a MCP

Seems to be a chipset/integrated graphics problem ?

In the meantime I've tried both, 9400GT and 9500GT PCIe graphic cards - same issue - MPEG2 blocks with vdpau decoding. H264 and VC1 works fine.
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Old 12-25-09, 09:35 PM   #33
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Default Re: VDPAU 9400GT MPEG2 artifacts

OK - i did the opposite of what i said. I replaced the 9400GT(MSI) with a Gigabyte GT220 1GB DDR3 - with a big 80mm fan. A quick google and i realized i would loose my hdmi audio and i need the 190.53 driver - i added the avernard repo and upgraded everything and 190.53 nvidia driver. Hard to believe but everything worked perfectly and i'm pleased to report NO MORE BLOCKS !!!! . The GT220 has better power control as my 9400 had none. I use VDPAU HighQulity setting in myth. All mpeg2 channels look amazing. a bluray i have (IceAge3) played back with only around 12-15% cpu . It is a merry christmas.
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Old 12-26-09, 06:33 PM   #34
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Default Re: VDPAU 9400GT MPEG2 artifacts

I have the same symptoms, but with a Sparkle 9500GT and a GA-M68SM-S2 motherboard. Similar to the others, this MB has the GeForce 7025 / nForce 630a chipset. I previously had an ASUS 8400GS, but it was the 256MB version and so it was underpowered for VDPAU. The 8400GS never displayed these artifacts, but they appeared as soon as I 'upgraded' to the 9500GT.

I happened to have access to another identical 9500GT, so I tried that one too. It behaved the same, so I don't believe this is simply a bad card.

As others have reported, the problem only affects MPEG2 recordings with VDPAU. Interestingly, the problem largely (but not entirely) disappears if I watch the same recordings with mplayer (with VDPAU). Using the mythtv internal player, there are far more artifacts.

I'm running Ubuntu 9.10 with Mythtv 0.22 and the Avenard patches, and the 195.30 driver.

Last edited by plaengert; 12-28-09 at 11:40 AM.
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Old 01-08-10, 01:48 PM   #35
rdriscoll
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Default Re: VDPAU 9400GT MPEG2 artifacts

Everyone in this thread has the GeForce 7025/10 / nForce 630a chipset and a 9400/9500 GPU. That combo seems to create the artifacts. gator123 reported that switching to a 220GT GPU solved it so far - but did anyone try switching motherboards yet? Seems like the artifacts are a timing issue, almost like the sections frame buffer are being skipped during de-interlacing and we are seeing what was there last. I didn't want to buy new hardware but it may be the easiest way to solve this.



Quote:
Originally Posted by plaengert View Post
I have the same symptoms, but with a Sparkle 9500GT and a GA-M68SM-S2 motherboard. Similar to the others, this MB has the GeForce 7025 / nForce 630a chipset. I previously had an ASUS 8400GS, but it was the 256MB version and so it was underpowered for VDPAU. The 8400GS never displayed these artifacts, but they appeared as soon as I 'upgraded' to the 9500GT.

I happened to have access to another identical 9500GT, so I tried that one too. It behaved the same, so I don't believe this is simply a bad card.

As others have reported, the problem only affects MPEG2 recordings with VDPAU. Interestingly, the problem largely (but not entirely) disappears if I watch the same recordings with mplayer (with VDPAU). Using the mythtv internal player, there are far more artifacts.

I'm running Ubuntu 9.10 with Mythtv 0.22 and the Avenard patches, and the 195.30 driver.
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Old 01-08-10, 04:14 PM   #36
Stephen Warren
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Default Re: VDPAU 9400GT MPEG2 artifacts

Interesting. I tracked down an nForce 630a and a similar GPU and managed to reproduce the problem with the "curious george" clip. I'll file a bug and see if we can find out what's going wrong.
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