[M4IF Technotes] scalability questions

[Rob Koenen]

Technoters,
There were some questions about scalability in the reference SW lately.
I asked an expert, who told me:
About the scalability tools in the reference software, my understanding is
that spatial scalability and temporal scalability in the Simple Scalable
Profile are implemented in the reference software, but may not be working
properly with the rate control part in the reference software, namely, rate
control may not work for the enhancement layer. The FGS and FGST tools work
fine in the reference software and do not need rate control for the
enhancement layer at the encoding time. A simple bitstream truncation
program is included in the reference software package to cut an FGS
bitstream to any bit rate that a user specifies. Since FGST is also a
temporal scalability tool (using FGS bitplane coding for the DCT
coefficients), only spatial scalability tool may not be working properly
with rate control in the enhancement layer (fixed QP should be ok). Hope
this is of some help.
I am still trying to understand the status of the reference SW - what has
been released by ISO and what hasn't. Will keep the list posted.
Rob
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