Can't play AC3 from Matroska container?

[GoogleCodeExporter]

What steps will reproduce the problem?
n/a

What is the expected output? What happens instead?
The expected output is 6 channel audio, but I don't hear it.

What version of the driver are you using? On what operating system? What
version of the operationg system are you using (32 or 64 bit)?
32bit XP Pro, latest version of the drivers up till now.

What ports of the soundcard are affected by the bug (e.g. SPDIF, Mic-In)?
SPDIF.

Please provide any additional information below.

No matter how many codecs I try (tried it with almost nothing on my system
installed), it seems that al 6channel AC3 audio in matroska containers
(mkv) doens't work, while 6 channel AC3 audio in AVI files DO work. Some
goes for DTS streams in mkv files.

How can I solve this?

Original issue reported on code.google.com by rene.bra...@gmail.com on 4 Sep 2008 at 6:33

[GoogleCodeExporter]

What player software have you tried?
Also, can you provide a snippet of the MKV file in question?

Original comment by dogb...@gmail.com on 4 Sep 2008 at 6:49

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I tried:

MPC
WMP
Zoom Player
BSPlayer

I found out something weird. When disabling passthrough I can hear the sound (it
sends 2ch audio to my receiver), but not the sound which is supposed to come 
from the
centerspweakers (voices :S).

VLC doesn't work either when choosing SP/DIF output, but when choosing 2ch 
output
(stereo) it will output sound better (in other words: it DOES send the center 
channel
to my receiver).

I don't have a snippet right now (not at home), I have it with multiple mkv 
files
containing AC3 (thusfar ALL mkv's with AC3). I can post some output from 
matroskadiag:

Codec : Dolby AC3 (A_AC3) 
Possible filter : AC3 Filter 
Installed : yes, in C:\Program Files\AC3Filter\ac3filter.ax (1.3.1.0) 
Link : http://ac3filter.sourceforge.net 
Language : English (eng) 
Sampling Frequency : 48000 
Channels : 6 

All files have similar/same output. While another AC3 3/2.1 6 chnls 48khz audio
stream from an avi worked like a charm.

Original comment by rene.bra...@gmail.com on 4 Sep 2008 at 7:19

[GoogleCodeExporter]

Can you try to extract the AC3 sound stream from the mkv and then test whether 
it 
plays with MPC?

Original comment by dogb...@gmail.com on 12 Sep 2008 at 2:34

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This weekend, I've made some tests with MPC 6.4.9.0 and several MKV files 
containing 
AC3 or dts streams, but I failed to reproduce the bug.

Original comment by dogb...@gmail.com on 15 Sep 2008 at 6:36

[GoogleCodeExporter]

I don't know if this will solve your problem.  I have audio AC3 problem with 
other 
tool, and this help. You may want to try download AC3 filter 1.51a in 
http://www.free-codecs.com/download/AC3_Filter.htm

Original comment by ifth...@gmail.com on 5 Oct 2008 at 2:01

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rene.brandt, any news?

Original comment by dogb...@gmail.com on 13 Oct 2008 at 6:10

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Original comment by dogb...@gmail.com on 24 Oct 2008 at 7:20

• Changed state: Invalid