[M4IF Technotes] The content in the DecoderSpecificInfo

[Heat Mist]

--- Jean-Claude Dufourd <Jean-Claude.Dufourd   enst.fr>
wrote:
> Heat Mist wrote:
> > Yes, I downloaded a few mp4 files that contain
> video
> > and/or audio. I haven't checked all of them. But
> the
> > file called 4videomaxmin_light.mp4 from "MPEG-4
> > Content" link on ENST doesn't follow the visual
> > DecoderSpecificInfo syntax defined in 14496-2.
> 
> Can you please be specific about the error ? This
> file works seamlessly 
> with the TILAB/Optibase player, with the Envivio
> player, with the IM1-2D 
> player. I feel confident that the error is minor if
> all these players 
> accept that content without problem.
> 
 
In the 4 ES_Descriptors within the esds atom of mp4v
stream, the DecoderSpecificInfo of the
DecoderConfigDescriptor doesn't contain
VisualObjectSequence(). (Shouldn't it? In 14496-2
Annex K: "VisualObjectSequence() is transmitted
explicitly in each DecConfigDescr.DecSpecificInfo of
an Object Descriptor".)
chen
> > Furthermore, all the ES_IDs in this file are 0,
> which
> > I thought should be different. 
> 
> This is not a bug, this is a feature. The ES_ID
> field of the 
> ES_Descriptor shall be set to 0 in the MP4 file, as
> stated in clause 
> 13.2.1.4 of the Systems spec.
> 
> Best regards
> JC
> -- 
> Jean-Claude Dufourd      
> @======================================@
> ENST, Dept COMELEC             The wing, over the
> big rock...
> 46, rue Barrault         
> @======================================@
> 75013 Paris                Tel: +33145817807    Fax:
> +33145804036
> 

__________________________________________________
Do you Yahoo!?
Yahoo! News - Today's headlines
http://news.yahoo.com