[M4IF Technotes] The content in the DecoderSpecificInfo

[Jean-Claude Dufourd]

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.
> 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