[mythtv] More nforce questions

[James Y Knight]

I believe you ought to use the 'plug' device, or as a syntactic 
shortcut, the 'plughw' device. Those proxy through the audio, doing 
rate/format/etc conversions on the fly if necessary. As in device 
"ALSA:plughw:0,1".

 From a message on the ALSA list:
"""
hw interfaces directly to the physical card.  Thus you can only use
modes supported by the hardware.  plughw will detect whether the
hardware can do what you are requesting, and automatically convert the
data to something that can be played, at the expense of CPU time.
"""

James

On Oct 29, 2003, at 7:30 PM, Drew Bernat wrote:

> First the good news -- I have mplayer and xine working through the
> on-board SPDIF output. I might have been reinventing the wheel, but... 
> if
> anyone wants help with the setup, let me know.
>
> Which brings me back to Myth. If I use the OSS audio output
> ("AudioOutputDevice=/dev/dsp") everything works fine, through the 
> analog
> outputs on my sound card. I'd really like to get digital working :) As 
> far
> as I can tell, this is going to mean using ALSA native support, and 
> that's
> when things break.
>
> To prefix: it appears as though the only rate ALSA supports when the
> digital output is enabled is 48Khz. I've tried setting the encoding 
> rate
> when recording to both 32Khz and 48Khz, no change in either case.
>
> Attempt 1: analog output through ALSA. I set the audio device to
> "ALSA:hw:0,0". I get sound output, but playback is extremely choppy 
> and I
> see large numbers of errors:
>   "Audio buffer overflow, audio data lost!"
>   "<date> prebuffering pause"
>   "Error determining sound output delay: Broken pipe"
>
> I get the same errors if I set the ALSA output to the spdif output
> (ALSA:spdif or ALSA:hw:0,1).
>
> Does this ring any bells? I would have thought that the problem was 
> due to
> the rate differences between my recordings (32Khz) and the sound device
> (48Khz), but I can record at 48Khz with no better effect.
>
> Also let me know if there's anything I can do to help. :)
>
> Drew
>
> -- 
> Drew Bernat                                                __ ____
> abernat at zathras.net                                         |  | |
> http://www.zathras.net                                         | |
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