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.
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