[apis] Suggested timeline for Media APIs next step

** with this mail I'm carrying out ACTION-130 **

Hi all,
during last Media APIs TF call, we agreed to work in iterations, in order
to be able to progress those use cases that are more mature while leaving
more time to those items that need further discussion.

Here is a proposal on how to work and also a possible timeline for the
current iteration and the following ones. This is for discussion during
todays call.

Each iteration could look like this:

Phase 1: collect use cases
Phase 2: generate requirements
Phase 3: gap analysis: are there existing spec covering this requirements
already? If not, which specs/WGs would need to be addressed to fill these
gaps?
Phase 4: consolidate UCs, reqs and gap analysis in one document and
 discuss next steps (reach out to WGs, etc)

For the first iteration of this process, I propose the following deadlines:

Aug 28th: last chance to submit UCs for inclusion in the first iteration
Sept 4th (conf call): discuss and agree on the final list of use cases
included in the first iteration
Oct 2nd (conf call): finalize and agree a list of requirements derived from
the use cases
Oct 30th (conf call): finalize gap analysis
12th of November (TPAC): review and approve the WG note including UCs, Req.
and Gap analysis and discuss next steps.


/g