comments on spatial media fragment (a broadcaster's perspective)

Hi All,

 

I've been participating in the Web and TV Interest Group over the past
few months. Within this Interest Group the Media Pipeline Task-Force
(MPTF) has been looking into what additional requirements there are from
within the industry with regards to the HTML5 <video>/<audio> tags. 

 

As part of the requirements gathering I put forward a use-case, which
involves a broadcaster transmitting mosaic style pictures, from which a
single element (i.e. a portion of this picture) can be scaled up to fill
the whole viewing region. 

 

The feedback I received from the use-case was that this may be possible
using media-fragments. After reviewing your specification I see that
this use-case has a lot in common with spatial fragments.

 

I am aware that the specification is in a proposed recommendation state
and therefore am not sure if I can add any comments or feedback. But if
this is still possible I have a couple of questions:

 

1)      In Section 7.2 (Clients Displaying Media Fragments) it states
that: "we foresee two distinct use cases: highlighting the spatial
region in-context and cropping to the region". Could there be an
additional use-case saying: scaling the spatial region up to fill the
complete video real-estate?

2)      I couldn't see anywhere in your document anything regarding
switching between spatial regions. From a broadcaster / content provider
perspective it would be highly desirable if the switching mechanism
didn't affect the video pipeline (i.e. no delays to video playback).
Could this possibly be added in?

 

Apologies if either of these questions have been discussed previously. I
didn't have time to go through the mail archive.

 

You can find the above mentioned use-case here:
http://www.w3.org/2011/webtv/wiki/MPTF/MPTF_Discussions/ViewPort-Support

 

Regards

Duncan

 

__________________________

Duncan Rowden
Research Engineer, Research & Development


BBC Future Media & Technology
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