[mythtv-users] MythTV sound through SPDIF

Eric Smith erictsmith at gmail.com
Mon Jun 4 17:37:14 UTC 2007


On 6/4/07, Ludmil Miltchev <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
> >
>
> -  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
>
> _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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> mythtv-users at mythtv.org
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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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