Re: [AVT] profile-level-id definition

[Ye-Kui Wang <yekuiwang at huawei.com>]

> >profile_idc 42 is MAIN profile ?

profile_idc 42 (hex) indicates the Baseline Profile. 

BR, YK 

> -----Original Message-----
> From: avt-bounces at ietf.org [mailto:avt-bounces at ietf.org] On 
> Behalf Of Randell Jesup
> Sent: Friday, May 15, 2009 8:30 AM
> To: onramp123 at yahoo.com
> Cc: avt at ietf.org
> Subject: Re: [AVT] profile-level-id definition
> 
> "Steve DeLaney" <onramp123 at yahoo.com> writes:
> 
> >Hello,
> >
> >we are trying to better understand the definition of 
> profile-level-id 
> >under
> >RFC3984 section 8.1 Having browsed the archive threads 
> including "SDP 
> >Negotiation based on Profile-Level-Id", I was hoping to get some 
> >clarification on this to break down the encoding for profile 
> and level.
> >
> >we are integrating a codec which, when encoding at 1080P60, 
> expresses 
> >profile-level-id=42001E as a hardcoded value.
> >to break this down
> >
> >profile_idc 42 is MAIN profile ?
> >level_idc 1E is level 3.0 ?
> 
> Others answered what those are.
> 
> Note: Level 3.0 DOES NOT support the resolution you're using. 
>  See http://en.wikipedia.org/wiki/H.264#Levels
> 
> 3.0 supports a max of 720x480 at 30 (or just over 60fps at 
> 352x480).  You need level 4.2 or above, OR with 3.0 you need 
> to advertise that you do both a larger number of 
> macroblocks/frame, and larger number of macroblocks/second 
> (max-fs and max-mbps if I remember).
> 
> Also, read the sections (in 3984bis - the draft about to 
> replace 3984) about level negotiation.  Profile and 
> constraints are fixed; level has some negotiation possible.  
> 
> --
> Randell Jesup, Worldgate (developers of the Ojo videophone), 
> ex-Amiga OS team rjesup at wgate.com "The fetters imposed on 
> liberty at home have ever been forged out of the weapons 
> provided for defence against real, pretended, or imaginary 
> dangers from abroad."
> 		- James Madison, 4th US president (1751-1836)
> 
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