[mythtvnz] DVB-T HD picture quality VDPAU issue?

[Aaron Drysdale]

I have a similar problem I think. I have a one-box frontend/backend with Ubuntu 8.10 and JYA’s repositories installed – however I’m just running SD on a Nova-S card.

 

Playback looks fine, but with non-VDPAU playback profile the CPU usage is up around 50-60%, while before I installed JYA’s repositories I was getting around 10%. This is on a quad core processor, and I’m estimating average CPU usage across all 4 cores. nVidia 8500GT graphics card.

 

With a VDPAU playback profile enabled, the CPU usage is still very high (~ 40%), and live TV looks good but “hiccups” every few minutes. That is, it pauses briefly then continues.

 

Do you think this is the same problem? If it is, then note I’m on DVB-S not DVB-T.

 

Regards

Aaron

From: mythtvnz-bounces at lists.linuxnut.co.nz [mailto:mythtvnz-bounces at lists.linuxnut.co.nz] On Behalf Of Steve V
Sent: Saturday, 9 May 2009 21:41
To: MythTV in NZ
Subject: Re: [mythtvnz] DVB-T HD picture quality VDPAU issue?

 


OK, I finally got back to some testing.

My problem is definitely a playback issue not a reception issue - yay I can stop fooling around with the aerial and cabling.

The playback problem is strange because it affects 720p content more than 1080i content.

Quick recap:

Backend:

Pentium 4 3Ghz

NOVA-T 500 tuner card

Unfortunately no PCIe slot so I can't put in a VDPAU capable card

 

Frontend:

ASUS M3N-HDMI  motherboard

Athlon 6000 (dual core) CPU

Built in NVIDIA 8300 graphics


Both running Mythbuntu 8.10 with JYA's repositories


 Here are the symptoms - on the Frontend.

Non VDPAU playback profile.

No problem with TV1 and TV2 playback in fact a recording that shows pixelation when using VDPAU does not have any pixelation during playback with this profile.
TV1 and TV2 (720p) playback has CPU usage around 62% but sometime over 90%
TV3 (1080i) playback has CPU usage over 100% and stutters

With VDPAU
TV1 and TV2 show pixelation with panning shots and fast motion
TV3 shows fine no pixelation

OK so I have 2 possible solutions:

1 change the settings so that VDPAU works for 720p content - I think the only option I have is to change the deinterlacer. I have tried every deinterlacer and that did not help 

2 use a profile that is non VDPAU for 720p and below and VDPAU for above. This is working OK but I would really like to get my CPU usage down.

So in summary if anyone has any clever ideas for improving VDPAU performance with 720p content i would love to hear it.

 


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