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Topic: Multichannel Decoder For Mpeg-2 File (Read 5738 times) previous topic - next topic
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Multichannel Decoder For Mpeg-2 File

I had posted this topic in another thread.
But little response. 

I have MP2 conformance bit-stream, e.g. test01.mp2.
This file has 5.1 channel configuration.

I tried to decode it with Lame(3.96.1) and foobar2000(0.8.3), but they could only decode the stereo channel part.

Does Lame can not decode MPEG-2 multichannel format?
Or is there any decoder can do it?
Source code is plus. 

Multichannel Decoder For Mpeg-2 File

Reply #2 –
Quote
Not sure what your goal is, exactly, but for multichannel transcoding, either BeSweet or HeadAC3he may be of help.

http://dspguru.doom9.org/

http://www.doom9.org/index.html?/audio-guides.htm
[a href="index.php?act=findpost&pid=275869"][{POST_SNAPBACK}][/a]


Nor BeSweet or HeadAC3he can read multichannel MPEG audio. They only read the first two channels in the stream. I remember there was only one software implementation of multichannel MPEG audio decoder, and it was a commercial library.

Usual decoders - MAD, mpg123, FhG... - can't decode multichannel MPEG audio.
 

Multichannel Decoder For Mpeg-2 File

Reply #3 –
Quote
Or is there any decoder can do it?

You should search for an old Philips player

Multichannel Decoder For Mpeg-2 File

Reply #4 –
Quote
You should search for an old Philips player[{POST_SNAPBACK}][/a]


[a href="http://www.rjamorim.com/rrw/mpegplayer.html]http://www.rjamorim.com/rrw/mpegplayer.html[/url]

Won't decode multichannel, I already tried.

Multichannel Decoder For Mpeg-2 File

Reply #5 –
you may try the ISO dist 10 decoder in the mpeg2-mc directory

Multichannel Decoder For Mpeg-2 File

Reply #6 –
Quote
you may try the ISO dist 10 decoder in the mpeg2-mc directory
[a href="index.php?act=findpost&pid=276017"][{POST_SNAPBACK}][/a]


Yes, this code really works. 
It seems a "old version" code although.

AFAIK, DVB includes MP2 as its multichannel format.
Is there any application that use MP2 multichannel?

Multichannel Decoder For Mpeg-2 File

Reply #7 –
I think that old PAL DVDs sometimes contained MP2 multichannel. While I never found a DVD software player to play more than the stereo part it actually worked quite well by using the decoding feature of my Soundblaster Audigy.

tiki4

Multichannel Decoder For Mpeg-2 File

Reply #8 –
I've never bothered to check if the Fhg mp3 surround demo is something different or just the iso mpeg2-mc implementation for layer3.

Multichannel Decoder For Mpeg-2 File

Reply #9 –
Quote
you may try the ISO dist 10 decoder in the mpeg2-mc directory
[a href="index.php?act=findpost&pid=276017"][{POST_SNAPBACK}][/a]

Link?

Quote
AFAIK, DVB includes MP2 as its multichannel format.
Is there any application that use MP2 multichannel?
[a href="index.php?act=findpost&pid=276032"][{POST_SNAPBACK}][/a]

DVB broadcasters use ac3 in general. The only real use that I know for mp2 multichannel is home made svcds.

Multichannel Decoder For Mpeg-2 File

Reply #10 –
Quote
Quote
you may try the ISO dist 10 decoder in the mpeg2-mc directory
[{POST_SNAPBACK}][/a]

Link?

[a href="ftp://ftp.tnt.uni-hannover.de/pub/MPEG/audio/mpeg2/software/technical_report/]Google is your friend, or click here[/url]

Multichannel Decoder For Mpeg-2 File

Reply #11 –
Quote
Quote
AFAIK, DVB includes MP2 as its multichannel format.
Is there any application that use MP2 multichannel?
[a href="index.php?act=findpost&pid=276032"][{POST_SNAPBACK}][/a]

DVB broadcasters use ac3 in general. The only real use that I know for mp2 multichannel is home made svcds.
[a href="index.php?act=findpost&pid=276056"][{POST_SNAPBACK}][/a]


DVB document, TS 101 154, says that
"The IRD should be capable of decoding at least the ISO/IEC 11172-3 compatible basic stereo information fom an ISO/IEC 13818-3 multi-channel audio bit-stream. Full decoding of an ISO/IEC 13818-3 multi-channel audio bit-stream is optional."
So I'm just out of curiosity to realize the syntax of the 13813-3 multi-channel.

I agree that DVB has capability of carrying AC-3 audio.
But how many multi-channel formats could be in DVB(which TS xxx?) ?
DTS?  MPEG-2/4 AAC?