Re: mad-dev Digest, Vol 6, Issue 8

Hi..

I?ve tried that program that you said, and my pcm file is totally corrupted..
Whish is not good at wall.
To get it I use the libmad and follow the steps:

#################################
make
make install
make minimad
./minimad <music.mp3>test.pcm
###################################

I compile that in Linux, gentoo.

I'm doing anything wrong?
I'm very concern about it.


Quoting [email protected]:

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> Today's Topics:
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>   1. Decodding error ([email protected])
>   2. Decoding error (H?vard Engebretsen)
>   3. RE: Decodding error (Bruno Gauthier)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Sun, 27 Nov 2005 21:38:48 +0000
> From: [email protected]
> Subject: [mad-dev] Decodding error
> To: [email protected]
> Message-ID: <[email protected]>
> Content-Type: text/plain;	charset=ISO-8859-1
>
> hi there... :)
> I've using libmad, and I want to decode a mp3 file, but I get the following
> decoding errors.
>
> this example is for a very small mp3.
>
> decoding error 0x0101 (lost synchronization) at byte offset 0
> decoding error 0x0102 (reserved header layer value) at byte offset 67
> decoding error 0x0101 (lost synchronization) at byte offset 85
> decoding error 0x0101 (lost synchronization) at byte offset 104
>
> but most of the times I get the following, this example is for 
> another mp3 file,
>
> decoding error 0x0101 (lost synchronization) at byte offset 0
> decoding error 0x0101 (lost synchronization) at byte offset 6034865
>
> it seems that I get errors at the begin and at the end of the offsets.
>
> Should I worry with this ?
> I does it happen?
> If someone could help me.. ;)
>
>
> thanks...
>
> Sónia Gonçalves
>
>
>
>
>
> ------------------------------
>
> Message: 2
> Date: Mon, 28 Nov 2005 00:33:24 +0100
> From: H?vard Engebretsen <[email protected]>
> Subject: [mad-dev] Decoding error
> To: <[email protected]>
> Message-ID: <[email protected]>
> Content-Type: text/plain; charset="iso-8859-1"
>
> Hi,
>
>
>
> I don’t know if this helps, but I’m getting the same errors as you do when I
> decode small mp3 files who is just a part of a song. My experience is that
> these errors does not effect the decoded file. Have you tried to play the
> decoded .pcm file? I do so with Audacity (http://audacity.sourceforge.net/,
> I import .pcm file as raw audio data in the project menu) and I can’t say
> there is anything wrong with the decoded file, at least from just listening
> to it.
>
>
>
> Regards,
>
> H.
>
> -------------- next part --------------
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> ------------------------------
>
> Message: 3
> Date: Mon, 28 Nov 2005 10:07:45 -0500
> From: "Bruno Gauthier" <[email protected]>
> Subject: RE: [mad-dev] Decodding error
> To: <[email protected]>, <[email protected]>
> Message-ID:
> 	<0CDE391BEED94B4185844504EE00BBD736F664@ATL1VEXC010.usdom003.tco.tc>
> Content-Type: text/plain;	charset="iso-8859-1"
>
> Hi there,
>
> I had the same problem. The way I fixed it was to feed the MAD 
> decoder with 1 second audio chucks that starting with the ADTS (Audio 
> Data Transport Stream) sync word (0xFFFC).
>
> I'm not a MPEG1 specialist but, if I remember well, every second, 
> over the 37 audio chunks, an ADTS header is injected.
> That header is always starting with the sync word: 0xFFFC.
>
> Therefore, if you provide the MAD decoder with 1 second audio chunk 
> (starting with the ADTS header) you should avoid the lost of 
> synchronization problem.
>
> Regards
>
> Bruno
>
> -----Message d'origine-----
> De : [email protected] 
> [mailto:[email protected]] De la part de [email protected]
> Envoyé : 27 novembre 2005 16:39
> À : [email protected]
> Objet : [mad-dev] Decodding error
>
> hi there... :)
> I've using libmad, and I want to decode a mp3 file, but I get the following
> decoding errors.
>
> this example is for a very small mp3.
>
> decoding error 0x0101 (lost synchronization) at byte offset 0
> decoding error 0x0102 (reserved header layer value) at byte offset 67
> decoding error 0x0101 (lost synchronization) at byte offset 85
> decoding error 0x0101 (lost synchronization) at byte offset 104
>
> but most of the times I get the following, this example is for 
> another mp3 file,
>
> decoding error 0x0101 (lost synchronization) at byte offset 0
> decoding error 0x0101 (lost synchronization) at byte offset 6034865
>
> it seems that I get errors at the begin and at the end of the offsets.
>
> Should I worry with this ?
> I does it happen?
> If someone could help me.. ;)
>
>
> thanks...
>
> Sónia Gonçalves
>
>
>
>
>
>
> End of mad-dev Digest, Vol 6, Issue 8
> *************************************
>
>