Re: [codec] draft test and processing plan for the IETF Codec

[Anisse Taleb <[e-mail]>]

Dear Jean Marc. 

Thank you for your valuable comments.

> 1) How much is "very low delay" and how much is "medium delay"?

This is based on section [5.1. Operating space] of the requirements document http://www.ietf.org/id/draft-ietf-codec-requirements-02.txt. 
"medium delay" (20-30ms), while a few require a "very low delay" (< 10 ms). Would you like to contribute some precise delay operating points for Opus?

> 2) What do "NWT" and "BT" mean?
Sorry for this, I should have defined these abbreviations, 

NWT = Not Worse Than.
BT = Better Than.

> 3) What's the difference between the "Reference Codecs" column and the
> "Requirements" column?

I am not entirely happy with how this table looks like. Essentially, the first column is the collection of codecs, while the requirements column details the actual requirements. I will group these in a next version.

> 4) How do you define the rates that do not exist in some codecs? For
> example, I see a reference to 12 and 16 kb/s for Speex, which has no such
> rates, and to 8, 12, 16 kb/s for iLBC, which does not have these rates
> either.

Thank you for pointing this out. If the rates are not supported, I would suggest to use closest bitrates. 
In this initial version, I didn't check if all codecs could be operated at the bitrates being proposed. 
Would you like to suggest on which rates ilbc and speex operated?

Kind regards,
/Anisse