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Drafting Comments on 'Triggered Interactive Overlay' use case

From: Yosuke Funahashi <yosuke@funahashi.cc>
Date: Mon, 09 Jun 2014 01:00:52 +0900
Message-ID: <539488B4.5010501@funahashi.cc>
To: "public-web-and-tv@w3.org" <public-web-and-tv@w3.org>
Hi Bin and Kaz,

Regarding the 'Triggered Interactive Overlay' use case Bin proposed, in the 
previous call we agreed that we quickly check (or do a straw gap analysis on) it 
against on-going works in the Media Resource In-band Tracks CG and the MMT WG, 
before further digging into this use case in the IG.

Here is my draft comments on the UC's five derived requirements from the CG's 
point of view. I don't think I fully understand the use case, so, Bin, could you 
check my comments and give me feedbacks please? Kaz, could you please make 
comments from MMI viewpoints?

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1. Triggered interactive overlay must have the ability to bind to the video it 
is associated with, including live, time-shifted programming or linear commercial.

[YF] The CG's APIs to MPEG2-TS [1] enable web apps to access TS descriptors, 
through which you can get event ids that VCRs use for their recording timers. 
You can use this id to bind the video and triggered interactive overlay if your 
service is built on MPEG2-TS.

Hybrid TV systems use AIT to manage the life cycle of applications, which is 
also accessible through the CG's APIs. However, there are different life cycle 
models and bindings between apps and channel and/or programs for each hybrid TV 
standard. We may need to define generic APIs if we go with AIT.

If you need higher level APIs, CRID or TV-Anytime may be a better solution from 
an architectural viewpoint but it requires you operate a TV-Anytime system.

Regarding linear commercial, I think there is no global standard about it in the 
broadcasting industry and each broadcaster or service provider implements the 
binding between apps and commercials by defining triggers in private data. So if 
we pursue this, we need to define generic APIs for the binding.

2. Triggered interactive overlay must have the ability to be kept alive / 
displayable to the TV viewer within the bounds of the video content length it is 
associated with, i.e. overlay display goes away when content it is bound to ends 
or user switches channel to different video content.

[YF] Ditto.

3. Triggered interactive overlay must have the ability to be displayed to the TV 
viewer over key event(s) within the video content

[YF] I think you can implement this by writing js scripts with existing web 
standards. Bin, do you mean we should define more declarative APIs to acheive this?

4. Triggered interactive overlay must have the ability to display or tear down 
based on channel, and / or time, and / or date, or other criteria

[YF] I think you can implement this by writing js scripts with existing web 
standards and the CG's APIs.

5. Triggered interactive overlay must have the ability to be kept alive/ 
displayable based on industry wide signaling technology.

[YF] I think the CG's APIs satisfy this requirement: The CG's API is an attempt 
to define how user agents should expose in-band tracks as HTML5 media element 
video, audio and text tracks so that Web applications can access the in-band 
track information, through the media element, in a interoperable manner across 
user agent implementations.
- - - - - - - - - - - - - - - - -

I'm looking forward to hearing from you.

Best regards,
Yosuke

[1] http://www.w3.org/community/inbandtracks/wiki/Main_Page


-- 
Yosuke Funahashi
co-Chair, W3C Web and TV IG
Chair, W3C Web and Broadcasting BG
Researcher, Keio Research Institute at SFC
Special Adviser, Tomo-Digi Corporation
Received on Sunday, 8 June 2014 16:01:20 UTC

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