FW: [M4IF Interop] FW: [M4IF Technotes] Question on DecodeSpecifi cInfo

[Rob Koenen]

-----Original Message-----
From: Dave Singer [mailto:singer   apple.com]
Sent: Monday, December 03, 2023 16:35
To: Michael Ropert
Cc: Rob Koenen; M4IF Interop (E-mail)
Subject: RE: [M4IF Interop] FW: [M4IF Technotes] Question on
DecodeSpecificInfo
At 6:33 PM +0100 12/3/01, Michael Ropert wrote:
?
Hi,
According to the visual norm (annex K),
a DSI is composed on several elements:
- VisualObjectSequence,
- VisualObject,
- VideoObject,
- VideoObjectLayer.
So what I understand, is that VisualObjectSequenceHeader must be
written in the DSI.
I agree.  It seems that since most of these headers contain little
information, people are tempted to put in only the one that has the
signficant data.  But that's not what the spec says.
Maybe I misunderstood your question ?
Michael ROPERT.
 <http://www.envivio.com> www.envivio.com
-----Message d'origine-----
De : interop-admin   lists.m4if.org [mailto:interop-admin   lists.m4if.org]De la
part de Rob Koenen
Envoyé : lundi 3 décembre 2001 18:22
À : M4IF Interop (E-mail)
Objet : [M4IF Interop] FW: [M4IF Technotes] Question on DecodeSpecificInfo
Question you interop guys must be able to answer!
Rob
-----Original Message-----
From: S.G.Chang [mailto:watanka   samsung.com]
Sent: Monday, December 03, 2023 14:13
To: M4IF
Subject: [M4IF Technotes] Question on DecodeSpecificInfo
Dear experts and members.
I have a question on "DecodeSpecificInfo" in MPEG-4 system.
As you know, the "DecoderSpecificInfo" in MPEG-4 system is needed to
initialize MPEG-4 decoder.
[ISO/IEC SG29/WG11, N4350, pp 478] says that VisualObjectSequence is
transmitted explicitly in each
DecConfigDecsr.DecSpecificInfo.  
This question is caused by Envivio player. According to our experiments
Envivio player can't decode
"VisualObjectSequenceHeader".
But i can't sure that "VisualObjectSequenceHeader" must be included in
"DecodeSpecificInfo" or not.
If you have information on this, please know me.
S.G.Chang
++++++++++++++++++++++++++++++
    Seung-Gi Chang, Ph.D.                
    Senior Engineer                            
    Mobile Solution Team,  DM Lab,   
    SAMSUNG Electronics Co            
++++++++++++++++++++++++++++++
-- 
David Singer
Apple Computer/QuickTime
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