[M4IF Technotes] Start code

[Dokic, Miroslav]

Dear Clover and all,
MPEG-1 Layers I,II and III      --- ISO/IEC 11172-3
MPEG-2 Layers I,II and III      --- ISO/IEC 13818-3
MPEG-2 AAC                      --- ISO/IEC 13818-7
MPEG-4 AAC				  --- ISO/IEC 14496-3
Best regards,
Miroslav
-----Original Message-----
From: cloverleafland   mail.hongkong.com
[mailto:cloverleafland   mail.hongkong.com]
Sent: Tuesday, June 24, 2023 6:32 PM
To: Dokic, Miroslav; technotes   lists.m4if.org
Subject: Re: RE: [M4IF Technotes] Start code
Dear Miroslav and all,
Thanks for your reply. Would you direct me which document I
should refer to in order to further distinguish between
AAC(MPEG-2/4) and MP3? 
Thanks a lot.
Regards,
Clover
> Clover,
> 
> MP3 and AAC do not have the start_codes in the form of
0x000001,
> rather the audio frame starts with 12 bit field 0xfff. 
> This is true for both MP3 and AAC. More bits after 0xfff are
> needed
> to figure out is it MP3 or AAC (or MPEG-1/2 Layer I or II for
> that matter) 
> 
> Best regards,
> 
> Miroslav
> 
> -----Original Message-----
> From: cloverleafland   mail.hongkong.com
> [mailto:cloverleafland   mail.hongkong.com]
> Sent: Tuesday, June 24, 2023 1:31 AM
> To: technotes   lists.m4if.org
> Subject: [M4IF Technotes] Start code
> 
> 
> Dear all,
> 
> Would any one know whether MP3 or AAC have start_code? if yes,
> what are the start code? Thanks a lot.
> 
> regards,
> clover
>
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