[solved] issue on 2-speakers to play .mkv with 5.1 channels

Hi,
I have a .mkv video files seems having 5.1 channels, but i only have 2 speakers and i think only heard 2 of the channels (sometimes only background music with subtitles, or sometimes only voice).
I use alsa+basic GStreamer player (parale), no pulseaudio or other audio dependencies.
Here's my questions:
1. How to confirm the number of audio channels in a .mkv file? (i really don't have extra speakers to plug into the audio panel)
2. I followed some ALSA wikis to downmix the channels into 2, but they don't work. Anyone could give me a link of an accurate setup wiki?
3. If this were not ALSA to downmix the channels, could it be gstreamer or something else? How?
Thanks!
Last edited by enihcam (2013-07-28 01:07:34)

Cloudef wrote:
I use this kind of alsa config for my downmixing needs.
https://github.com/Cloudef/dotfiles-ng/ … sound.conf
Keep in mind though, that some player might do their own downmixing or just reduces the channels (dropping sounds and so), so you need to force them to use the audio's original channel amount.
On mplayer I usually just force this with channels=6 for some sort of 5.1 emulation and it sounds beautiful. (without alsa downmixing, some of the sounds will be on low volume though)
Thanks but it doesn't work.
Actually I found a solution:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=541786
BUT, this also brings another issue -- it loses ability to play multiple audio file simultaneously. It seems like dmix is disabled.
I'm wondering how to merge this solution with your configuration to get dmix back.
Last edited by enihcam (2013-07-27 10:24:48)

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