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rmflook
PostPosted: Wed Aug 01, 2007 12:48 pm 
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Joined: Wed Jan 24, 2007 2:29 pm
Posts: 101
Hi there,

I just purchased myself a lovely logitech 5.1 surround sound system to work with my mythbox. However i can only get it to play out of the front speakers. Now currently i am simply playing music, but would very much like the music to come out of all the speakers connected up to the system.

The speaker system is connected up to my computer via the 3 coloured analogue cables. The sound card is an onboard 5.1 card (alsaconf recognises it as a VIA High Definition Audio Controller, and when running alsa mixer it is recognised as a HDA VIA VT82xx with a Realtek ALC880 chipset).

In alsamixer i have cranked up the Front, Surround and Center volume controls to max. If i run the command

speaker-test -c6 -Dsurround51

then i only get 'pink sound' out of the front two speakers.

Within mythtv settings the 'Passthrough output device' is set to 'ALSA:iec958:{AES0 0x02}' (though i have no idea what this means), the 'Mixer device' is set to '/dev/mixer' and the 'Mixer controls' is set to 'Master'.

I would be very grateful for any help on this as i would like to get the full benefit from my new speaker system. Many many thanks in advance.
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rmflook
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PostPosted: Wed Aug 01, 2007 1:23 pm 
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Posts: 101
Just a quick update, plugged the system up to my windows box which has a 5.1 sound card in it and it works no problems, so i know it isnt faulty hardware
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Girkers
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PostPosted: Thu Aug 16, 2007 3:44 am 
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Joined: Tue Mar 22, 2005 9:18 pm
Posts: 1422
Location: Brisbane, Queensland, Australia
The problem is that you have your sound card set to use the digital output and thus you will only get sound out of the speakers that are connected to the digital port.

I have an Creative Soundblaster Audigy and my digital output is called IEC958 Optical and I have that muted and then the analogue outputs are then used. Ensure that you have the volumes turned up on the speakers that you have connected in alsamixer otherwise you may not hear anything either.

In mythtv set your output device to ALSA:plug:surround51 and the mixer to default, you may have to type these in by hand. This is how I got mine to work as per this post.

Good luck and let us know how you fair or if you need any more help.

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rmflook
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PostPosted: Mon Aug 20, 2007 6:38 am 
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Posts: 101
Sorted, cheers mate
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Girkers
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PostPosted: Tue Aug 21, 2007 1:45 am 
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Posts: 1422
Location: Brisbane, Queensland, Australia
rmflook,

Could let us know what you did to get yours working just to clarify the topic for those users in the future.

Thanks

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infinitenothing
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PostPosted: Sat Oct 20, 2007 12:23 pm 
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Joined: Sat Dec 10, 2005 3:41 pm
Posts: 62
I'm having trouble getting surround sound to work on DTV playback
I'm using onboard sound (the 3 headphone like jacks) to 6 RCA inputs on my tuner.

Motherboard chipset is an Nforce2.
Chip is the C-Media Electronics CMI9739

I get pink noise on all 6 channels with this command:

Code:
speaker-test -c6 -Dsurround51


I'm using
Code:
ALSA:plug:surround51

as my sound device

I've disabled pass through.

I get no sound and no apparent errors when I watch TV.

If I set the sound device to the default /dev/dsp I get stereo sound.

I'm running R5F27

EDIT:

I get 6 channels with mplayer if set the following flags:
Code:
mplayer -ao  alsa:device=surround51 -channels 6 -af surround

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infinitenothing
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PostPosted: Sun Oct 21, 2007 2:26 pm 
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Joined: Sat Dec 10, 2005 3:41 pm
Posts: 62
Ahh, that makes sense. The errors are from the frontend. I was looking at the backend.

Code:
2007-10-21 13:16:28.525 TV: Attempting to change from None to WatchingPreRecorded
0: start_time: 8298.416 duration: 320.928
1: start_time: 8298.398 duration: 320.904
stream: start_time: 92204.424 duration: 3566.060 bitrate=16650 kb/s
2007-10-21 13:16:28.723 AFD: Opened codec 0x8469a80, id(MPEG2VIDEO) type(Video)
2007-10-21 13:16:28.723 AFD: Opened codec 0x846b0a0, id(AC3) type(Audio)
2007-10-21 13:16:28.727 Opening ALSA audio device 'surround51'.
2007-10-21 13:16:28.841 mixer set channel 0 err -22: Invalid argument
2007-10-21 13:16:28.841 mixer unable to find control Master 1
2007-10-21 13:16:28.937 VideoOutputXv: XvMCTex: Init failed
2007-10-21 13:16:28.938 VideoOutputXv: XVideo Adaptor Name: 'NV17 Video Texture'
2007-10-21 13:16:29.558 TV: Changing from None to WatchingPreRecorded
Unable to launch application

2007-10-21 13:16:29.564 Using realtime priority.
2007-10-21 13:16:29.666 Video timing method: RTC
2007-10-21 13:16:33.475 NVP::AddAudioData():p1: Audio buffer overflow, audio data lost!
2007-10-21 13:16:33.508 NVP::AddAudioData():p1: Audio buffer overflow, audio data lost!
2007-10-21 13:16:33.509 NVP::AddAudioData():p1: Audio buffer overflow, audio data lost!
2007-10-21 13:16:33.542 NVP::AddAudioData():p1: Audio buffer overflow, audio data lost!
2007-10-21 13:16:33.608 NVP::AddAudioData():p1: Audio buffer overflow, audio data lost!
2007-10-21 13:16:33.609 NVP::AddAudioData():p1: Audio buffer overflow, audio data lost!
... this repeats for a while


Hmm, looks like I'm getting buffer overflow error. I tried the two audio buffering options I could find (agressive audio buffering in the same place as audio output device and disabling "extra audio buffering" in general playback) but still no luck

Still it's odd that mplayer works and the internal one doesn't.

Looks like there may be a patch coming up:

http://cvs.mythtv.org/trac/ticket/1104

I'd try it, but patches are over my head I think.

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