Anyone familiar with WMA 5:1 audio?

John Gay johngay at eircom.net
Wed Oct 13 11:22:59 PDT 2004


Well, in trying to listen to HHGG in surround sound, I fetched 
h2g3_episode3.asf from the BBC site. But I don't have surround sound in my 
computer, so I wanted to burn it to CD or DVD to listen on the home surround 
system.

mplayer says this about the stream:

Playing HHGG3.asf.
ASF file format detected.
Clip info:
 name: Tertiary Phase - Episode 3 - WMA 5:1
 copyright: (C) MMIV
==========================================================================
Opening audio decoder: [dmo] Win32/DMO decoders
======= WAVE Format =======
Format Tag: 354 (0x162)
Channels: 6
Samplerate: 44100
avg byte/sec: 16002
Block align: 5945
bits/sample: 16
cbSize: 18
Unknown extra header dump: [10] [0] [3f] [0] [0] [0] [0] [0] [0] [0] [0] [0] 
[0] [0] [e0] [0] [0] [0]
===========================
======= WAVE Format =======
Format Tag: 1 (0x1)
Channels: 2
Samplerate: 44100
avg byte/sec: 176400
Block align: 4
bits/sample: 16
cbSize: 0
===========================
External func OLEAUT32.dll:7
External func OLEAUT32.dll:8
GetOutput r=0x0   size:49152  align:1
StreamCount r=0x0  1  1
AUDIO: 44100 Hz, 2 ch, 16 bit (0x10), ratio: 16002->176400 (128.0 kbit)
Selected audio codec: [wma9dmo] afm:dmo (Windows Media Audio 9 DMO)
==========================================================================
Checking audio filter chain for 44100Hz/2ch/16bit -> 44100Hz/2ch/16bit...
AF_pre: af format: 2 bps, 2 ch, 44100 hz, little endian signed int
AF_pre: 44100Hz 2ch Signed 16-bit (Little-Endian)
AO: [oss] 44100Hz 2ch Signed 16-bit (Little-Endian) (2 bps)
Building audio filter chain for 44100Hz/2ch/16bit -> 44100Hz/2ch/16bit...
Video: no video
Starting playback...

As you can see, it does recognise the 6 channels, but seems to play two. In my 
limited knowledge of surround sound, I know that surround sound can be 
encoded in stereo channels and play through a standard Dolby surround system. 
Also, there are other formats that encode all 6 channels which can play 
through a suitable DVD system.

So my question, which format is the WMA file in, and how can I burn it to 
either CD or DVD to listen to it in full surround sound?

Cheers,

	John Gay



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