[M4IF Technotes] Use of Error Resilience Tools with MPEG4 Simple Scalable Profile

[Hobson Paola-BPH001]

Dear M4IF Experts
I would be grateful for your advice on a question about Table G on Page 421 of ISO/IEC JTC 1/SC 29/WG 11 N2802 Vancouver, July 1999 (ISO/IEC 14496-2 FPDAM 1) in which it is shown that the use of Error Resilience Tools with Temporal Scalability and Spatial Scalability is not supported by the Syntax.
Please could someone explain the reasons behind the decision to prohibit the use of these tools together, and if possible point me to an SC29WG11 input or output document in which an explanation for this decision appears.  Also please could I ask for your advice on the importance of this decision.  Motorola has found that use of MPEG4 Simple Scalable Profile in a mobile communication environment would benefit greatly from the ability to use error resilience tools in the enhancement layers, and I would be very interested to hear other opinions on this issue.
Thank you very much.
Paola
Dr Paola Hobson
Manager of Multimedia Applications Research
Motorola UK Research Lab