[M4IF Technotes] iods & 3GPP

[AVARO Olivier FTRD/DIH/REN]

> Some MPEG-4 players interpret this iods, bifs and OD 
> information to support 
> multiple MPEG-4 objects. In the case of 3GPP, this 
> information is optional 
> since the structure is pretty simple and does not require 
> such information. You 
> might want to add it in the file if you wish to be compatible 
> with ISO but non-
> 3GPP players.

I would very much support this.
The reasons why 3GPP departs from the MPEG-4 models are all but non technical. 3GPP could very much have used the mechanisms in place without ANY additionnal complexity. Keeping files always compatible with ISO MPEG-4 will ensure easy exchange from the mobile environment to the internet environment.
The 3GPP current design, although compliant as far as the file format is concerned, is very limited and not future proof. It lacks support of many important features (like IPMP, dynamique scene descriptions, ...) that will need to be re-invented in a near future.
Kinde regards,
Olivier