[mythtv-users] surround 5.1 sound

Ma Begaj derliebegott at gmail.com
Sat Nov 3 20:36:04 UTC 2007


2007/11/3, Ismo Tanskanen <ismot at telemail.fi>:
> 007/11/3, Ismo Tanskanen <ismot>:
>  > Is mythfrontend capable to send 5.1 sound out from soundcard's analog
>  > connectors? I'm planning to buy cheap 5.1 speaker set to bedroom. They
>  > don't use digital out, but connect directly to soundcard, which has 5.1
>  > speaker outputs. SC is soundmax integrated (asus m2npv-mx)
>  >
>  > Now, I only get sound from front speakers, even if there is 5.1 track. I
>  > use internal player to play dvd. TV channels also transmit surround
>  > sound often.
>
> I have MVNPV-VM which is mostly similar to your board and I have same
> issues.
> All my recordings are stereo only and it does not matter if I hear
> sound only on the front speakers. I tried to make all speakers work
> also with with MythTv to spread 2.0 sound over all 5 speakers but I
> had no success.
>
> MPlayer is playing videos nice 5.1 surround and that is more important
> to me.
>
>
> You could probably solve this with a correct .asoundrc file, because I
> think this is more ALSA's problem than MythTv's. I tried it this way
> (see below), but without success. It would be great to hear that
> someone knows how to set this up. You can find more information on
> ALSA wiki.
>
> This configuration worked with "aplay -D pcm.20to51 filename" but not
> with MythTv. I tried changing sound output device in MythTv to
> ALSA:20to51, ALSA:pcm.20to51, ALSA:device=20to51 etc but it didn't
> worked.
>
> # Expand stereo to all channels including LFE
> pcm.20to51 {
> type route
> slave.pcm surround51
> slave.channels 6
> ttable.0.0 1
> ttable.1.1 1
> ttable.0.2 1
> ttable.1.3 1
> ttable.0.4 0.5
> ttable.1.4 0.5
> ttable.0.5 0.5
> ttable.1.5 0.5
> }
>
> # Create the Master mixer device that controls *all* channels
> # I call it Master because alsamixer has no Master, only PCM
> pcm.!default {
> type softvol
> slave.pcm "20to51"
> control {
> name "Master"
> card 0
> }
> }
>
> M.
>
>
> Thanks for response. Does mplayer play videos in 5.1 format
> automatically, or does it need any command line parameters to do that?


mplayer -ao alsa:device=surround51 -channels 6 video.avi

If video does not contain 5.1 sound, it plays it only on the front
speakers as in mythtv

M


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