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jiaxi
n00b
Joined: 25 Sep 2012
Posts: 30
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 Posted: Sat Apr 20, 2013 8:12 am Post subject: 6 channels to 2 channels issue[SOLVED] |
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HI,
My sound card only support 2 channels.But I cannot hear dialogue only background sound when i play 6 channels music of wav.
I can hear dialogue and background in windows.
my commond is as fellow and no asound.conf in my system.
aplay 6channels.wav
Last edited by jiaxi on Thu May 02, 2013 2:26 am; edited 1 time in total |
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simon_irl
Guru
Joined: 07 Oct 2004
Posts: 403
Location: New Zealand
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| Posted: Sun Apr 21, 2013 4:43 am Post subject: |
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doesn't | Code: | | aplay -c 2 6channels.wav |
downmix the 6 channels to 2 so that you can hear all of them through your stereo setup? if not, mplayer can downmix properly, so play it via | Code: | | mplayer -channels 2 6channels.wav |
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s_bernstein
Apprentice
Joined: 11 Mar 2006
Posts: 172
Location: Bremen, Germany
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| Posted: Sun Apr 21, 2013 7:01 am Post subject: |
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| I suppose you use gstreamer as backend. If so, send a *big* thank you to the guys at gstreamer because they removed the resampling feature. They changed it in order to be compatible to pulseaudio, which noone really needs but which needs the unchanged input to resample by itself. So, either you switch over to pulseaudio, or you stop using gstreamer backend. VLCplayer works for me. |
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PaulBredbury
Watchman
Joined: 14 Jul 2005
Posts: 7310
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| Posted: Sun Apr 21, 2013 7:46 am Post subject: |
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| s_bernstein wrote: | | either you switch over to pulseaudio, or you stop using gstreamer backend. |
Why? ALSA is perfectly capable of resampling, by itself, e.g. "rate 48000".
jiaxi, see "pcm.downmix_51to20" in the config in my sig.
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jiaxi
n00b
Joined: 25 Sep 2012
Posts: 30
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| Posted: Mon Apr 22, 2013 11:43 am Post subject: |
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| PaulBredbury wrote: | | s_bernstein wrote: | | either you switch over to pulseaudio, or you stop using gstreamer backend. |
Why? ALSA is perfectly capable of resampling, by itself, e.g. "rate 48000".
jiaxi, see "pcm.downmix_51to20" in the config in my sig. |
I use the config of pcm.downmix_51to20,but i also here two channel sound only.
This is asound.conf:
pcm.!default {
type plug
slave.pcm "routed"
}
pcm.routed {
type route
slave {
pcm "hw:0,0"
}
ttable.0.0 0.33
ttable.1.1 0.33
ttable.2.0 0.33
ttable.3.1 0.33
ttable.4.0 0.16
ttable.4.1 0.16
ttable.5.0 0.16
ttable.5.1 0.16
} |
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PaulBredbury
Watchman
Joined: 14 Jul 2005
Posts: 7310
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| Posted: Mon Apr 22, 2013 11:50 am Post subject: |
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You have it backwards. Don't go through pcm.default first, because pcm.default is only 2 speakers, so will chop off the other speakers, before their audio data has been processed.
Notice my (revised) example:
| Code: | pcm.downmix_51to20 {
type route
slave.pcm "surround20" |
So that goes through downmix_51to20 before 2-speaker output.
To test it:
| Code: | | speaker-test -c 6 -D downmix_51to20 -t wav |
It doesn't mix properly if I use slave.pcm "dmixed" - has to be "plug:dmixed" 
Anyway, "default" or "surround20" will work also - I think "surround20" is clearer. |
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jiaxi
n00b
Joined: 25 Sep 2012
Posts: 30
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| Posted: Thu May 02, 2013 2:26 am Post subject: |
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| PaulBredbury wrote: | You have it backwards. Don't go through pcm.default first, because pcm.default is only 2 speakers, so will chop off the other speakers, before their audio data has been processed.
Notice my (revised) example:
| Code: | pcm.downmix_51to20 {
type route
slave.pcm "surround20" |
So that goes through downmix_51to20 before 2-speaker output.
To test it:
| Code: | | speaker-test -c 6 -D downmix_51to20 -t wav |
It doesn't mix properly if I use slave.pcm "dmixed" - has to be "plug:dmixed"
Anyway, "default" or "surround20" will work also - I think "surround20" is clearer. |
Thanks. It is ok. |
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