[mythtv-users] Buffer underrun/audio stuttering

[Michael Sciscenti]

Thanks, but I have it even with XVMC off (plus HD video is doesnt play
smoothly at all without xvmc for me). What settings are you using with XVMC
off that youre able to watch HD content?

On 11/25/05, Curtis Stanford <curtis at stanfordcomputing.com> wrote:
>
>
> On Nov 25, 2005, at 12:02 AM, Michael Sciscenti wrote:
>
> > I've tried to avoid emailing the list until I was absolutely sure I
> > couldn't get any further without help.
> >
> > I'm trying to get a Mythtv frontend/backend server up and running
> > on a P4 2.8 GHz box with 1 GB RAM and Nvidia Geforce 6800. HDTV
> > over firewire is what I'm having trouble with. I can now reliably
> > connect to the cable box and get HDTV streams using test-mpeg2 and
> > in Mythtv itself, however I've been completely unsuccessful at
> > solving my audio stuttering problem. I've tried every combination
> > of settings and every little suggestion I could find on the
> > internet and this list yet I still get the following errors:
> >
> > 2005-11-24 04:33:52.663 audio waiting for buffer to fill: have 2048
> > want 4096
> >
> > or
> >
> > 2005-11-24 04:33:54.567 WriteAudio: Preparing 4096 bytes (1024 frames)
> > 2005-11-24 04:33:54.568 WriteAudio: buffer underrun
> >
> > Things I've tried but none have gotten rid of the stuttering:
> > ALSA, OSS emulation through ALSA, an asoundrc is present, Xvmc on/
> > off, deinterlacing (bob) on/off, extra sound card buffering on/off
> > (the TV settings option), agressive buffering on/off (in General
> > settings), priority process on/off, etc, you name, I've tried it.
> >
> > The problem exists in both the current release of mythtv and svn
> > from two days ago. I'm running Gentoo. Does anyone have any
> > suggestions?
> >
> > My configure setting:
> > ./configure --disable-distcc --prefix=/usr --mandir=/usr/share/man
> > --disable-altivec --disable-xvmc-vld --disable-directfb --disable-
> > audio-oss --disable-directx --enable-firewire --disable-audio-jack
> > --disable-joystick-menu --enable-lirc --enable-xvmc --enable-opengl-
> > vsync --enable-xv --enable-x11 --enable-proc-opt --disable-dbox2 --
> > disable-ivtv
> >
> > Also of note, I'm using a PCI firewire card that has a VIA chipset.
> > Some have said there are issues with these, but I dont think its
> > the source of my problems since I'm able to grab streams fine using
> > test-mpeg2 and they playback perfectly in mplayer using xvmc. My
> > motherboard is a SiS chipset.
> >
> > Any help would be awesome, I'm about at my wits end and starting to
> > look at other platforms, but really would like to stick with myth
> > if possible. Thanks.
>
> I had the same problem with XvMC on. Works fine with it off, however.
> I'm using FX5200 and P4 2.4GHz and firewire on DCT-6200.
> By the way I also have a cheap $20 PCI firewire card with the VIA
> chipset and it works fine. Sometimes, my node switches on me (0 to 1
> or 1 to 0) for no apparent reason, but otherwise it works well.
>
> Curtis
>
>
>
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>
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