[mythtv-users] Audio Capture Problems, IR Blaster

Nick Couchman Nick.Couchman at seakr.com
Wed Feb 4 01:19:48 UTC 2009

Hi, everyone,
I'm trying to get my first MythBox set up and am having some issues capturing audio correctly and getting my IR Blaster to work.  I have a Hauppauge WinTV Go Plus card, which translates to a bt878 chipset.  It has a TV Tuner input, a Composite Input and audio In and Out jacks, as well as the "three-headed" IR connector.  I'm having a couple of issues:
- First, audio capture does not work correctly, either when watching live TV or when recording.  I'm using the snd-bt87x ALSA module to use the on-board capture device.  After loading the module, the audio board does show up in /sys/class/sound and /proc/asound, and the devices are created in /dev.  I can control the mixer via alsamixer (alsamixer -c 1), both with the root account and with the "myth" account - the one I'm using to run MythTV.  Permissions appear to be set correct - seems that the system is using ACLs and has added the "myth" user to the ACL for the /dev/dsp1 device, which corresponds to the audio device on the Hauppauge card.  However, when I try to view live TV or try to record and then watch something, I get no audio.  Instead, I get the following message every 10 seconds in my mythbackend.log file:
NVR(/dev/video0) Error: Only read -1 bytes of 4096 bytes from '/dev/dsp1'
I've tried adjusting the sampling rate, changing the audio codec to both MP3 and Uncompressed, but none of these seem to fix the issue.  Any ideas, anyone?
- Second, the card has a built-in IR Blaster and IR receiver.  The module that's supposed to work for this card is the lirc_i2c module.  When I load the module, the lirc_dev module auto-loads, then the lirc_i2c tries to load, loads enough to recognize the card, but then segfaults and exits.  This may be more a question for the lirc list, but I figured since it's an IR system integrated with a TV card, maybe someone will have some ideas.
My system is a P4/2.0 with 1GB of RAM.  I'm running OpenSuSE 10.3, kernel build number), and MythTV 0.21 (from the Packman repo).  Any help would be greatly appreciated!

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