[mythtv-users] Re: Funny problem with alsa and AC3 passthrough/rate conversion

[mrmagoo]

    I was experimenting with the dmix plugin and didn't realise what I
was doing and played an mp3 after I had started playing a DD5.1
recording and got a sound I'd describe similar to that.  It looks like
the settings you were messing with would have enabled/disabled the
dmix plugin particularly, could this have been the case?
    I don't understand how ALSA works and why it can't do conversion
by default, and I'm pretty sure I was doing something wrong but I
could never get dmix to work the way I wanted it to.



On 9/27/05, David Maher <dm at netsol.com.au> wrote:
> I have just fixed it. Don't ask why this worked, because I have no idea.
> I changed from coaxial spdif to optical spdif output on my frontend. The optical worked properly with AC3. So I changed back to coax to verify that this was the problem. The coaxial digital output then also worked properly! I am now unable to get it to fail, I didn't touch the cable from the coax output on the pc, and I used a diffeent input on the amp for the optical output. So really I haven't physically changed anything. maybe it's an intermittent fault with the onboard sound? I have noticed that smetimes if I use aplay to test 22khz file using the mixed-digital plug, the first time I play it it plays fast, if I repeat the excercise it is OK.
> weird huh?
>
> Cheers
>
> David M
>
> -----Original Message-----
> From: mythtv-users-bounces at mythtv.org
> [mailto:mythtv-users-bounces at mythtv.org]On Behalf Of David Maher
> Sent: Wednesday, 28 September 2005 10:43 AM
> To: Discussion about mythtv
> Subject: RE: [mythtv-users] Re: Funny problem with alsa and AC3
> passthrough/rate conversion
>
>
> Thanks for that Nick,
> Your solution would work with my dvb tuners, but unfortunately if I do that my rate conversion will no longer work and my analogue tuner will sound like mickey mouse.
>
> -----Original Message-----
> From: mythtv-users-bounces at mythtv.org
> [mailto:mythtv-users-bounces at mythtv.org]On Behalf Of Nick Fasano
> Sent: Wednesday, 28 September 2005 8:36 AM
> To: mythtv-users at mythtv.org
> Subject: [mythtv-users] Re: Funny problem with alsa and AC3 passthrough
> /rate conversion
>
>
> > Everthing was working fine using ALSA:mixed-digital, but lately, if I
> > enable AC3 passthrough in the mythfrontend, my amp outputs a horrible
> > buzzing sound when it gets a dolby digital signal from myth.
>
> I was having the same problem with my amp and dolby digital.  I
> solved it by removing my .asoundrc file and using ALSA:spdif as the
> output device.  Then go into KMix and mess with the settings until it
> works.  I discovered this through pure trial and error, but it now
> works properly and I don't mess with it.  Hope that helps.
>
> Nick
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