[Bug 25092] Need a way to inform script that resolution restrictions are applied

https://www.w3.org/Bugs/Public/show_bug.cgi?id=25092

--- Comment #13 from Mark Watson <watsonm@netflix.com> ---
(In reply to David Dorwin from comment #12)
> (In reply to Mark Watson from comment #11)
> ...
> > Requiring content that might be subject to restrictions such as downscaling
> > to have a different key id, even a 'fake' one, is arbitrary and introduces a
> > new system requirement (multiple key ids embedded in content) to address a
> > limitation of a single platform (HTML).
> > 
> > In general we should be able to play any and all content that is compatible
> > with the byte-stream specification, including CENC for the ISO BMFF case. We
> > should not introduce additional requirements on the byte-stream unless
> > absolutely necessary.
> 
> To clarify, the fake key ID does not need to be in the media resource
> ("content" and "byte-stream" above). It would only need to be in a session.
> Since it is fake, the same fake key ID could always be provided for all
> content.

Ok, then I am not sure how the 'fake key ID' idea is supposed to work. Assuming
there is no impact on the content, then if every bitrate indicates the same key
id in the CENC structures (PSSH, TENC) where does the 'fake' id appear and how
does the CDM know that this id is a synonym for the one in the media files ?

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Received on Monday, 28 April 2014 23:26:30 UTC