[M4IF Technotes] The content in the DecoderSpecificInfo

[Heat Mist]

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.
Furthermore, all the ES_IDs in this file are 0, which
I thought should be different. If all the others mp4
files from "MPEG-4 Content" are from the same sources,
they tend to have the same problem.
Chen
--- Jean-Claude Dufourd <Jean-Claude.Dufourd   enst.fr>
wrote:
> Dear Mr Chen
> 
> Heat Mist wrote:
> > The reason that I am
> > asking is that the mp4 files that I downloaded
> from
> > ENST don't conform to this. 
> 
> What ? This is impossible. ENST files are compliant
> by contruction. ;-))))
> 
> On a more serious notes, you seem to be talking
> about something strictly 
> concerning video. Did I understand you correctly
> when I reformulate like 
> this: you have found, in some ENST mp4 files, video
> streams for which 
> the DecoderSpecificInfo syntax did not match your
> expectations according 
> to 14496-2 ?
> If so, I need to issue a disclaimer: as much as we
> take care in 
> preparing our mp4 files, our AV streams are only as
> good as our video 
> and audio providers make them. These providers
> include a variety of 
> sources. Please tell me which files so that I can
> pass the information 
> to a video specialist.
> 
> Best regards
> JC
> -- 
> Jean-Claude Dufourd      
> @======================================@
> ENST, Dept COMELEC             The wing, over the
> big rock...
> 46, rue Barrault         
> @======================================@
> 75013 Paris                Tel: +33145817807    Fax:
> +33145804036
> 

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