[mythtv-users] mythbuntu 9.10 / myth 0.22 & vdpau

Peter Lord peter at plord.co.uk
Wed Oct 7 15:02:38 UTC 2009


I've recently re-installed my settup box with the recently released mythbuntu 
9.10 beta.  Currently going through the process of getting everything working 
:-)

One issue I have is vdpau.

With the "slim" playback profile selected, mythfrontend.real uses around 27% 
of the cpu and picture quality is fine.  But with a "vdpau" profile (no 
deinterlacer) I get poor picture quality (lots of pixelization and sound 
distortion) although cpu usage is reduced to around 10%.

I have :-

* 2xUSB DVB-T (UK)
* nvidia-185-libvdpau / myth 0.22.0~trunk22242-0ubuntu1 packages
* set iGPU frame size to 512M in the bios
* checked X is accelerated (using glxinfo)
* AMD Athlon(tm) 64 X2 Dual Core Processor 5600+
* resolution is auto set to 1280x1024 / 24
* combined frontend/backend configuration
* signal strength reported at 96% with S/N of 1.7db

I've also checked http://www.mythtv.org/wiki/VDPAU and tried the suggestions, 
but I couldn't get anything to give me a usable picture.

In mythwelcome.log I see :-

2009-10-07 15:56:55.552 TV: Changing from None to Watching WatchingLiveTV
2009-10-07 15:56:55.552 TV: State is LiveTV & mctx == ctx
2009-10-07 15:56:55.552 New DB connection, total: 3
2009-10-07 15:56:55.552 New DB connection, total: 4
2009-10-07 15:56:55.553 Connected to database 'mythconverg' at host: localhost
2009-10-07 15:56:55.554 Connected to database 'mythconverg' at host: localhost
2009-10-07 15:56:55.556 The realtime priority setting is not enabled.
2009-10-07 15:56:55.556 OpenGLVideoSync()
2009-10-07 15:56:55.557 TV: UpdateOSDInput done
2009-10-07 15:56:55.557 TV: UpdateLCD done
2009-10-07 15:56:55.558 TV: ITVRestart done
2009-10-07 15:56:55.590 ScreenSaverX11Private: DPMS Deactivated 1
2009-10-07 15:56:55.598 Video timing method: SGI OpenGL
2009-10-07 15:56:58.352 [mpeg2video @ 0x7fc699255820]ac-tex damaged at 4 21
2009-10-07 15:56:58.355 [mpeg2video @ 0x7fc699255820]Warning MVs not available
2009-10-07 15:57:00.921 NVP(0): Forcing decode extra audio option on (Video 
method requires it).
2009-10-07 15:57:01.035 AFD: Opened codec 0x7fc66ade4190, id(MPEG2VIDEO) 
type(Video)
2009-10-07 15:57:01.035 AFD: codec MP2 has 2 channels
2009-10-07 15:57:01.035 AFD: Opened codec 0x7fc66ade47d0, id(MP2) type(Audio)
2009-10-07 15:57:01.035 AFD: codec MP2 has 1 channels
2009-10-07 15:57:01.035 AFD: Opened codec 0x7fc66ade7160, id(MP2) type(Audio)
2009-10-07 15:57:01.035 AFD: Opened codec 0x7fc66ade77a0, id(DVB_SUBTITLE) 
type(Subtitle)
2009-10-07 15:57:01.192 Opening audio device 'default'. ch 2(2) sr 48000
2009-10-07 15:57:01.192 Opening ALSA audio device 'default'.
2009-10-07 15:57:01.306 Mixer unable to find control Master
2009-10-07 15:57:01.306 Mixer unable to find control Master
2009-10-07 15:57:01.310 NVP(0): Enabling Audio
2009-10-07 15:57:07.447 [mp2 @ 0x7fc699255820]Header missing
2009-10-07 15:57:07.447 AFD Error: Unknown audio decoding error


Is there anything I can do to improve the quality ?

Thanks,

Pete



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