Automatically detect number of available audio channels

zlorf · 19th August 2018, 20:43

Hi,

I'm using mpc hc + lav splitter and ffdshow or lav audio decoder (I can easily switch them).

PC has two audio outputs:
1) stereo speakers for daily activities;
2) yamaha receiver + beam projector for home cinema (5.1) via hdmi cable
I can switch audio output using built-in Windows 7 audio dialog (changing default playback device)

The problem I'm facing is that player/LAV doesn't detect currently selected playback device and number of available channels. So that when I'm playing some 5.1 content on stereo speakers, the center channel is muted.
I can of couse go to LAV audio decoder -> Mixing -> Enable mixing + stereo, this way I can hear sound properly on stereo speakers, but then I need to uncheck "enable mixing" every time I switch to 5.1 setup and it's cumbersome.

So, is there a way to tell player/LAV/ffdshow "hey man, look at the system settings and find out how many audio channels are available, then use this knowledge to automix"?

huhn · 19th August 2018, 22:46

what audio renderer hare you using?

windows is can do on it's own. you usually have to to nothing.

clsid · 20th August 2018, 15:18

Control Panel > Sounds > Speakers > Configure > select Stereo

zlorf · 20th August 2018, 19:59

@huhn
As I've written, I'm currently using LAV audio decoder, but previously I've tried ffdshow aduio as well (and the same problem).

@clsid
Yeah I've done that (Moreover, I've configured yamaha receiver to be 5.1 (in the same way via control panel)). The problem is that player + LAV still tries to output 5.1 content on these stereo speakers, effectively dropping center channel out.

clsid · 20th August 2018, 21:06

It should not matter what the decoders are outputting. The Windows mixer is supposed to downmix it to stereo. The driver may be at fault.

zlorf · 21st August 2018, 07:54

Ah, that may be the cause! I've recently updated audio drivers (realtek). I will take a look.

zlorf · 28th August 2018, 07:54

@clsid Thanks, that was the right idea. After reinstalling audio drivers everything works as expected.

19th August 2018, 20:43	#1 \| Link
zlorf Registered User Join Date: Aug 2018 Posts: 4	Automatically detect number of available audio channels Hi, I'm using mpc hc + lav splitter and ffdshow or lav audio decoder (I can easily switch them). PC has two audio outputs: 1) stereo speakers for daily activities; 2) yamaha receiver + beam projector for home cinema (5.1) via hdmi cable I can switch audio output using built-in Windows 7 audio dialog (changing default playback device) The problem I'm facing is that player/LAV doesn't detect currently selected playback device and number of available channels. So that when I'm playing some 5.1 content on stereo speakers, the center channel is muted. I can of couse go to LAV audio decoder -> Mixing -> Enable mixing + stereo, this way I can hear sound properly on stereo speakers, but then I need to uncheck "enable mixing" every time I switch to 5.1 setup and it's cumbersome. So, is there a way to tell player/LAV/ffdshow "hey man, look at the system settings and find out how many audio channels are available, then use this knowledge to automix"?

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19th August 2018, 22:46	#2 \| Link
huhn Registered User Join Date: Oct 2012 Posts: 7,921	what audio renderer hare you using? windows is can do on it's own. you usually have to to nothing.

20th August 2018, 15:18	#3 \| Link
clsid ***** Join Date: Feb 2005 Posts: 5,647	Control Panel > Sounds > Speakers > Configure > select Stereo

20th August 2018, 19:59	#4 \| Link
zlorf Registered User Join Date: Aug 2018 Posts: 4	@huhn As I've written, I'm currently using LAV audio decoder, but previously I've tried ffdshow aduio as well (and the same problem). @clsid Yeah I've done that (Moreover, I've configured yamaha receiver to be 5.1 (in the same way via control panel)). The problem is that player + LAV still tries to output 5.1 content on these stereo speakers, effectively dropping center channel out.

20th August 2018, 21:06	#5 \| Link
clsid ***** Join Date: Feb 2005 Posts: 5,647	It should not matter what the decoders are outputting. The Windows mixer is supposed to downmix it to stereo. The driver may be at fault.

21st August 2018, 07:54	#6 \| Link
zlorf Registered User Join Date: Aug 2018 Posts: 4	Ah, that may be the cause! I've recently updated audio drivers (realtek). I will take a look.

28th August 2018, 07:54	#7 \| Link
zlorf Registered User Join Date: Aug 2018 Posts: 4	@clsid Thanks, that was the right idea. After reinstalling audio drivers everything works as expected.