[x264-devel] About level_idc in sdp offer/answer

[Andrew Krupiczka]

Hi Min,

In principle, the level_idc implies processing capability limits of your encoder/decoder.
In the videoconferencing negotiation protocol situation normally you need to agree to tech. characteristics (incl. levels) which are supported by all involved devices - in your case it is a lower/common/shared level supported by both clients.
Having said that, it is possible that a particular device could also support higher levels - I'd advise to look at device(s) spec. to see what max. level it is able to support.
Best regards,

Andrew


-----Original Message-----
From: x264-devel-bounces at videolan.org [mailto:x264-devel-bounces at videolan.org] On Behalf Of Min Wang
Sent: Monday, July 16, 2012 9:30 AM
To: x264-devel at videolan.org
Subject: [x264-devel] About level_idc in sdp offer/answer

Hi H264 Gurus:

    I have a sip client sending video call with sdp:

        Media Attribute (a): fmtp:97 profile-level-id=42E01f, 
packetization-mode=1

   but replied by another client as

      Media Attribute (a): fmtp:97 profile-level-id=42E00b


      the difference seems to be:  level_idc.

      Does the level_idc matter ?


       Please see details at:  
http://java.net/nonav/projects/jitsi/lists/users/archive/2012-07/message/63


kind regards.



min

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