[mythtv-users] MythTV sound through SPDIF

Ludmil Miltchev ludmilmm at gmail.com
Mon Jun 4 18:20:06 UTC 2007


Eric Smith wrote:

> On 6/4/07, *Ludmil Miltchev* <ludmilmm at gmail.com 
> <mailto:ludmilmm at gmail.com>> wrote:
>
>     Hi to everyone!
>
>     My MythTV used to work flawlessly with a stereo analog sound (2ch). I
>     decided to switch to SPDIF and now when I try to watch TV, DVDs or
>     listen to music (using the Internal player) I don't get any sound.
>     However, I can watch videos (using MPlayer) without any problem.
>
>     ===================================================================================
>
>     I tried fixing the problem, using the following articles:
>
>     - Configuring Digital Sound with AC3 and SPDIF
>     <http://www.mythtv.org/wiki/index.php/Configuring_Digital_Sound_with_AC3_and_SPDIF
>     <http://www.mythtv.org/wiki/index.php/Configuring_Digital_Sound_with_AC3_and_SPDIF>>
>
>     -  I get no sound from MythTV when watching TV but MythMusic and
>     command-line test all work fine. What is the problem?
>
>     <
>     http://www.mythtv.org/wiki/index.php/Configuring_Digital_Sound#I_get_no_sound_from_MythTV_when_watching_TV_but_MythMusic_and_command
>
>     -line_test_all_work_fine.__What_is_the_problem.3F>
>
>     -  But I want to have all my sound go to the S/PDIF connector, how
>     do I
>     do that?
>
>     <http://www.mythtv.org/wiki/index.php/Configuring_Digital_Sound#But_I_want_to_have_all_my_sound_go_to_the_S.2FPDIF_connector.2C_how_do_I
>     <http://www.mythtv.org/wiki/index.php/Configuring_Digital_Sound#But_I_want_to_have_all_my_sound_go_to_the_S.2FPDIF_connector.2C_how_do_I>
>
>     _do_that.3F>
>
>     =======================================================================================
>
>     When I run: #> aplay -L, I get:
>
>     {
>     cards 'cards.pcm'
>     front 'cards.pcm.front '
>     rear 'cards.pcm.rear'
>     center_lfe 'cards.pcm.center_lfe'
>     side 'cards.pcm.side'
>     surround40 'cards.pcm.surround40'
>     surround41 'cards.pcm.surround41'
>     surround50 ' cards.pcm.surround50'
>     surround51 'cards.pcm.surround51'
>     surround71 'cards.pcm.surround71'
>     iec958 'cards.pcm.iec958'
>     spdif 'cards.pcm.iec958'
>     modem 'cards.pcm.modem'
>     phoneline 'cards.pcm.phoneline'
>     dmix 'cards.pcm.dmix'
>     default    {
>         type hw
>         card 0
>         device 2
>     }
>
>     My /home/mythtv/.asoundrc file:
>
>     pcm.!default {
>     type hw
>     card 0
>     device 2
>     }
>
>     My /etc/asound.conf file:
>
>     pcm.!default {
>     type plug
>     slave {
>     pcm "spdif"
>     rate 48000
>     format S16_LE
>     }
>     }
>
>     I added "options snd-pcm-oss dsp_map=2" at the end of my
>     /etc/modprobe.conf file.
>
>     In my frontend (Utilities/Setup - Setup - General) I have:
>
>     Audio Output Device: /dev/adsp
>     Passthrough output Device: ALSA:default
>     Mixer Device: default
>     Mixer Controls: PCM
>
>     I also tried checkihg and unchecking the boxes next to:
>     Enable AC3 to SPDIF passthrough
>     Enable DTS to SPDIF passthrough
>
>     ======================================================================================
>
>
>     So far, I haven't been able to get the sound to work with watching TV,
>     DVD or listening to music in MythTV. I tried getting a help from a
>     friend who knows a lot more than me about Linux and MythTV (I am a
>     newby), but he was not able to help me, either.
>
>     I am running MythTV ver. 0.2 on Suse 10. My sound card is: ALi M5455
>     with spdif-out (6ch).
>
>     I would really appreciate any help (hints, articles, ideas, etc.)
>
>     Please, let me know if you need any more info about my
>     system/configuration.
>
>     Thank you!
>
>     Ludmil
>
>
>
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>
>
>
> I found all the asound config to be unnecessary.  What ended up 
> working for me was, make sure ac3 and dts passthrough are both 
> enabled.  And then change both the audio and passthrough output 
> devices to be ALSA:iec958.  That's all I needed, hopefully it will 
> work for you as well.
>  
>
>
>------------------------------------------------------------------------
>
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>  
>
Hi Eric!
Thank you for your advice! It did work for playing TV and DVDs. I still 
can't play music through MythTV (and I used to play it with 2ch analog 
audio cable). Did you have any issues with playing music?
Thanks!
Ludmil


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