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#1 2008-12-28 00:04:53
- kwoo
- Member
- Registered: 2008-12-03
- Posts: 2
Only background audio tracks from .mkv?
I'm trying to use elisa (essentially gstreamer) to play a .mkv with what I suspect is AC3 audio (not totally sure). I'm only getting the surround tracks and no voices which i think are on a different channel. Video is a little laggy on startup but is otherwise fine. I'm using gstreamer 0.10. The file also plays fine in mplayer. Anyone have any advice? Thanks.
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#2 2008-12-28 08:24:10
- daneel971
- Member
- Registered: 2008-03-28
- Posts: 197
Re: Only background audio tracks from .mkv?
Use mkvinfo (mkvtoolnix package) to find out how many channels has your ac3 stream. If it's a 5.1 audio stream, then: if you have a 5.1 speaker system (and assuming you're using ALSA) use the surround51 output plugin, if you have a stereo speaker system you have to downmix the track to 2.0 (but this should be automatic, anyway...).
As you already guessed, in a 5.1 ac3 track usually voices are in the center channel.
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#3 2008-12-28 23:56:02
- kwoo
- Member
- Registered: 2008-12-03
- Posts: 2
Re: Only background audio tracks from .mkv?
So it appears that it is actually 5.1 Channel AAC audio. VLC also has this problem, I had to manually force it down to 2 channels and then it was fine. I played around a bit more and I just installed pulseaudio and it mixes it down to stereo fine. Don't know why alsa wasn't doing it automatically for AAC files.
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