Over the last month or two I have been putting together a MythTV machine and am most of the way there. The one problem that I can't solve, and can't find much information on, pertains to the quality of the audio.
My problem is that the audio I hear when I watch LiveTV or record a show is horrible. It sounds like it is recorded at a very low samplerate and comes through only in mono. Testing via the 'aplay /dev/dsp' method shows an 8000hz mono stream and the sound output is very similar to what I hear in MythTV. If I force aplay to use a higher sample rate or stereo then it plays back the audio in very short bursts at a very fast speed every few seconds, all the while reporting a series of 'underran!' errors. If I record using sox then I can grab much better sounding audio in stereo at higher sampleratesrates (44100 was no problem). Thinking it could be a duplex issue I opened another terminal and played the audio stream as it was recording, there didn't seem to be any problems with playing back the higher quality stream while audio was still being recorded. I also tried recording a program in MythTV without watching it (just leaving the main menu screen up) and when I went to play it back the audio quality was no better to LiveTV. I've done most of my fiddling using the onboard Nforce3 audio of my motherboard, which uses the intel8x0 module. I also tested a CMI8330 based PCI card and found the same mono/8000hz problem as with the other card. In both instances I tried various mixer settings from 10% up to 100% and have still had no luck. The system is Gentoo based with a 2.6.9 kernel if that matters. I'm getting video from a BT8x8 card, tried a couple as I had them around and could think of nothing else. If anybody wants to see any mixer settings, logfiles or any other form of output I can provide it, but have to admit I am not sure what information would be most useful. I am unsure if this is a hardware, ALSA, MythTV, etc problem. Thank you in advance for any help.
_______________________________________________ mythtv-users mailing list [email protected] http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users
