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List:       sip-implementors
Subject:    RE: [Sip-implementors] H.264 in SIP - question about profile-level-id
From:       "Kotler, Andrey" <Andrey.Kotler () polycom ! co ! il>
Date:       2005-07-26 9:42:47
Message-ID: 144ED8561CE90C41A3E5908EDECE315C020EF73B () IsrExch01 ! israel ! polycom ! com
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Hi !

You should refer to ITU-T H.264 standard

>From the document

Conformance of a bitstream to the Baseline profile is specified by
profile_idc being equal to 66 = 0x42
Conformance of a bitstream to the Main profile is specified by
profile_idc being equal to 77 = 0x4D
Conformance of a bitstream to the Extended profile is specified by
profile_idc being equal to 88 = 0x58


	
Andrey


-----Original Message-----
From: sip-implementors-bounces@cs.columbia.edu
[mailto:sip-implementors-bounces@cs.columbia.edu] On Behalf Of Tal
Shahar
Sent: Tuesday, July 26, 2005 10:46 AM
To: sip-implementors@cs.columbia.edu
Subject: [Sip-implementors] H.264 in SIP - question about
profile-level-id 

Hi,

 

I'm trying to find out what does the digits in profile-level-id in h.264
stands for.

>From RFC 3984 I understood the 4 less significant digits but I couldn't
understand the other 2.

For example in 42A01E, 42 stand for baseline profile but I couldn't find
good explanation what each bit represents.

*         What each bit represents in the 2 most significant digits? 

For example what does the 4D represent in this profile-level-id: 4D401E?


*         How do I represent supporting main profile? Extended profile?

 

Thanks,

Tal

 

 

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