[mythtv-users] VDPAU Audio Issues

[Harley Peters]

On Thu, 13 Aug 2009 18:21:24 +0100
stalks <mythtv-users at stalks.nooblet.org> wrote:

> Symptom: Audio drops out for half a second at seemingly random 
> intervals. Can happen several times a minute, or once every 5
> minutes. I find that some shows I record are worse than others (my
> test show and worse offender is Friends from channel E4 UK). It
> happens in not only MythTV but also mplayer, xine and xbmc. I post
> here hoping for guidance.
> 
> My setup,
> - Intel DP43TF, Q6600, 8GB DDR2, 1x Seagate 7200rpm 250GB, ASUS
> GeForce 8400GS, Onboard Intel HD Audio
> - Audio/Video output via HDMI (via onboard SPDIF passthrough) to
> Samsung LE40R87
> - Debian Linux amd64, running Linux Kernel 2.6.30 setup as
> "squeeze/testing"
> - 3x Hauppauge Nova-T DVB-T Model 909 with 3 MultiRec each
> - MythTV Frontend & Backend running from SVN r21236 (latest as of
> last night)
> 
> I started using VDPAU in April, had this issue since then, and have 
> compiled new MythTV SVN installs on a regular basis using following 
> commandline (ccache is installed),
> make clean && make distclean && \
> svn revert -R * && svn up && \
> ./configure --enable-vdpau --disable-directfb --enable-libfftw3 &&
> make -j4 && \
> sudo make install
> 
> What I have attempted so far:
> - I have tried 3 different graphics cards:
>  o XFX 8800GT 512MB
>  o ASUS 9400GT 1GB
>  o ASUS 8400GS 256MB
> - Nvidia drivers 185.18 and 190.18
> - Kernel 2.6.28 and 2.6.30
> - Aggressive audo buffering on & off (currently off)
> - Extra sound buffering on & off (currently on)
> - Realtime processing (curently off and run as "mythtv" user)
> - Alsa from debian repository (1.0.16) and now compiled alsa 1.0.20
> - Disabling VDPAU (this fixes the issue, but is not ideal)
> 
> It is only until last night that I realised the problem was VDPAU. I 
> needed to disable VDPAU to have unicode subtitles work in XBMC and
> then noticed that there wasn't a single audio drop throughout a film.
> I then changed to the "Normal" profile in MythTV and watched several
> episodes of Friends without any audio problems. Re-enabling VDPAU
> brought the symptoms back again.
> 
> With logging on "most" I haven't noticed anything untoward, I can
> post a log if required.
> 
> Everything else is perfect. (Audio/Video sync/quality etc.).
> 
> Is there a setting/compile option I have overlooked?
> Am I alone with this symptom?
> What can I do to debug?
> 
> Some basic info available at the following URLs:
> http://www.nooblet.org/other/jawa-vdpau/dmesg.txt
> http://www.nooblet.org/other/jawa-vdpau/lspci.txt
> http://www.nooblet.org/other/jawa-vdpau/lspci_vv.txt
> http://www.nooblet.org/other/jawa-vdpau/lsmod.txt
> http://www.nooblet.org/other/jawa-vdpau/alsa.txt
> http://www.nooblet.org/other/jawa-vdpau/nvclock.txt
> 
> Regards,
> Steve.
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> mythtv-users at mythtv.org
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Are you using digital audio out ?

I have digital audio out and have audio drop outs with every driver
from 185.18.14 to the latest.
For me 185.18.10 works pretty good with only an occasional drop out.

Harley