[mythtv-users] AV-Sync problem
David Wong
david.wong at marvel.com.hk
Thu Apr 16 06:23:57 UTC 2009
----- "R. G. Newbury" <newbury at mandamus.org> wrote:
> David Wong wrote:
> >
> >
> > ----- Original Message -----
> > From: "greg" <greg12866 at nycap.rr.com>
> > To: "Discussion about mythtv" <mythtv-users at mythtv.org>
> > Sent: Wednesday, April 15, 2009 3:09:11 AM (GMT+0800)
> Asia/Hong_Kong
> > Subject: Re: [mythtv-users] AV-Sync problem
> >
> > David Wong wrote:
> >> Hi all,
> >>
> >> I am running 0.21 branch with VDPAU patch #r20300, on NVidia 9400
> IGP with Intel Q2D E7400 2.8GHz.
> >>
> >> When I play some of DTV channel in my living place, I got lots of
> following warnings:
> >>
> >> "Audio 686 ms behind video but already 75 video frames queued.
> AV-Sync might be broken. "
> >>
> >> and some audio buffer underrun error, both video and audio are not
> smooth.
> >> Video output resolution is not important too.
> >>
> >> It only happens in 2 SD H.264 channels from same broadcaster here.
> >>
> >> It looks like that audio packet, in form of libavformat packet?, is
> very lag behind video.
> >> It is not very surprising as the two channels are rather low bit
> rate. Broadcaster makes very extreme
> >> configuration to accommodate 1 HD and 3 SD channels in a 21Mbps
> carrier.
> >>
> >> I check into the code. It seems the playback engine only checks
> enough video when pre-buffering,
> >> and left audio buffer unchecked. Is my observation valid? Are
> there anyway to both ensure enough
> >> video and audio before playback?
> >>
> >> Or anyway to buffer more data? I think it is better to be measured
> in time rather than in data size.
> >>
>
> >>
> > I used to have this problem until i removed pulseaudio... Try
> removing
> > it and see if that resolves your problem..
>
> >
> > I tried "sudo /etc/init.d/pulseaudio stop" in my Mythbuntu 8.10.
> > Unfortunately, it doesn't help.
> > Thanks anyway.
> >
> > David
>
>
> Try 'apt-get remove alsa-plugins-pulseaudio' and reboot
>
>
> alsa-plugins-pulseaudio io the name of the package in Fedora, and it's
>
> likely the same in Ubuntu.
>
> Geoff
>
> --
> Please let me know if anything I say offends you.
> I may wish to offend you again in the future.
>
> Tux says: "Be regular. Eat cron flakes."
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seems no such package in (myth/u)buntu 8.10
david at david-desktop:~$ dpkg -l *pulse*
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Cfg-files/Unpacked/Failed-cfg/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Name Version Description
+++-======================================-======================================-============================================================================================
ii gstreamer0.10-pulseaudio 0.10.10.4-1ubuntu1.1 GStreamer plugin for PulseAudio
un libao-pulse <none> (no description available)
ii libpulse-browse0 0.9.10-2ubuntu9.3 PulseAudio client libraries (zeroconf support)
ii libpulse0 0.9.10-2ubuntu9.3 PulseAudio client libraries
ii libpulsecore5 0.9.10-2ubuntu9.3 PulseAudio sound server core
un libsdl1.2debian-pulseaudio <none> (no description available)
ii pulseaudio 0.9.10-2ubuntu9.3 PulseAudio sound server
ii pulseaudio-esound-compat 0.9.10-2ubuntu9.3 PulseAudio ESD compatibility layer
ii pulseaudio-module-gconf 0.9.10-2ubuntu9.3 GConf module for PulseAudio sound server
ii pulseaudio-module-hal 0.9.10-2ubuntu9.3 HAL device detection module for PulseAudio sound server
un pulseaudio-module-jack <none> (no description available)
un pulseaudio-module-lirc <none> (no description available)
ii pulseaudio-module-x11 0.9.10-2ubuntu9.3 X11 module for PulseAudio sound server
un pulseaudio-module-zeroconf <none> (no description available)
ii pulseaudio-utils 0.9.10-2ubuntu9.3 Command line tools for the PulseAudio sound server
david at david-desktop:~$ dpkg -l *alsa*
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Inst/Cfg-files/Unpacked/Failed-cfg/Half-inst/trig-aWait/Trig-pend
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Name Version Description
+++-======================================-======================================-============================================================================================
un alsa <none> (no description available)
ii alsa-base 1.0.17.dfsg-2ubuntu1 ALSA driver configuration files
un alsa-headers <none> (no description available)
un alsa-oss <none> (no description available)
ii alsa-utils 1.0.17-0ubuntu3 ALSA utilities
ii bluez-alsa 4.12-0ubuntu5 Bluetooth audio support
ii gstreamer0.10-alsa 0.10.21-3ubuntu0.1 GStreamer plugin for ALSA
un libarts-alsa <none> (no description available)
ii libesd-alsa0 0.2.40-0ubuntu1 Enlightened Sound Daemon (ALSA) - Shared libraries
ii libpt-1.10.10-plugins-alsa 1.10.10-2ubuntu3 Portable Windows Library Audio Plugin for the ALSA Interface
un libpt-plugins-alsa <none> (no description available)
ii libsdl1.2debian-alsa 1.2.13-2ubuntu1 Simple DirectMedia Layer (with X11 and ALSA options)
ii libsox-fmt-alsa 14.0.1-2build2 SoX alsa format I/O library
un libwine-alsa <none> (no description available)
un vlc-plugin-alsa <none> (no description available)
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