[mythtv] [mythtv-commits] Ticket #1104: multi channel audio support

Michael T. Dean mtdean at thirdcontact.com
Sun Feb 19 13:53:04 UTC 2006

On 02/19/2006 01:30 AM, Mark Spieth wrote:
>> #1104: multi channel audio support
>> Works great, but i had to change the audio-output-device from /dev/dsp to
>> ALSA:plug:surround51:0 to get 5.1 and not only Dolby surround. Finding
>> that out was pretty tricky.
>> If everybody has to make this setting, a little hint would be good.
>> Perhaps in the Help-Text if you choose "6 Channels".
> yes this is known. you need alsa for analog out.
> good idea.
> was alsa::default not good enough?
That would completely depend on the user's ALSA configuration...  If 
there's an ~/.asoundrc or /etc/asound.conf that re-defines !default to 
use a 2-channel-only capable plugin (like dmix), it won't--no matter 
what Myth does.  If the user doesn't re-define !default, it depends on 
the sound card's configuration (see /usr/share/alsa/cards/*.conf for 
specifics)--some use dmix (see ATIIXP.conf) and other plugins for 
!default to give the user a more "Windows-like" experience.  :(

However, if we're going to put a note in, I highly recommend making a 
note of where to find info on creating an ALSA configuration so the user 
doesn't have to specify all the device options in Myth, but instead 
specifies a name defined in his/her ALSA configuration.  Of course, this 
would mean I should probably do as I've been meaning--clean up the 
Wiki's ALSA configuration stuff (the part there now is a completely 
hacked up version of a post I sent to the ML) and expand on it to make 
it more appropriate for general use.  Maybe I can work on it while 
traveling this week.


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