Hi, all. I've got a 2-tuner system, one PVR-250 recording perfectly, and one obstinate bt878-based card. I'm running Fedora Core 3 2.6.10-1.741_FC3. I've also tried the 681 release, but it seems those rpms have been pulled for ivtv, so I had to upgrade.
I've followed Jarod's excellent guide, but I seem to be stuck on piping the audio from the bt878 and recording it in MythTV. I have 4, count 'em, 4 different sound cards, one of which is brand new, just arrived. The others were a little old, and ALSA support was sketchy. I thought this new one would be the answer. The mixers are all set correctly. I'm very confident I know what I'm doing in this regard. I ran the line-out from the bt878 to the Aux input on the soundcard. I successfully get audio using xawtv and unmuting the Aux line. This works on all my sound cards. What doesn't work is capture. I'm using the new card now. When I mute Aux and enable Capture for Aux, aplay /dev/dsp gives this: Playing raw data '/dev/dsp' : Unsigned 8 bit, Rate 8000 Hz, Mono underrun!!! (at least 15.238 ms long) underrun!!! (at least 15.337 ms long) underrun!!! (at least 15.483 ms long) underrun!!! (at least 15.460 ms long) underrun!!! (at least 15.460 ms long) underrun!!! (at least 15.460 ms long) I actually do hear the TV, but it sounds cruddy, naturally, at 8-bit 8khz mono. In MythTV, I get no sound. In mythtvsetup, the tuner is correctly set up to capture on /dev/dsp. There are no other /dev/dsp's in my /dev directory. There are no other sound devices in /dev that work with aplay (I've tried all the following devices: /dev/adsp, /dev/sound, and several files in /dev/snd - controlC0 pcmC0D0c pcmC0D0p pcmC0D1p pcmC0D2c pcmC0D2p timer, none work the way /dev/dsp does). My bt878 doesn't seem to support btaudio or snd_bt87x drivers, so line-out is the only option. Stumbling around google and the forums, I found reference to a sox command. Lo and behold, when I the following while using xawtv: # sox -w -r 44000 -t ossdsp /dev/dsp -t ossdsp /dev/dsp I get MUCH better audio. It's not perfect, however, because it has little pops in it. I don't know why MythTV has no audio. I don't know why aplay /dev/dsp always gives me back 8 bit, 8kHz audio. This sounds foolish, but is there a way to make MythTV change its sample rate or maybe record through sox (gag)? Please, please, someone help me out on this. I know a lot of other people are having this exact same problem. Thanks, Larry
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