[Bug 17673] Define Initialization Data for implementations that choose to support the ISO Base Media File Format

https://www.w3.org/Bugs/Public/show_bug.cgi?id=17673

--- Comment #37 from David Dorwin <ddorwin@google.com> ---
In http://lists.w3.org/Archives/Public/public-html-media/2014Jan/0037.html, I
suggested that we might use a simple identifier that is *not* a MIME type (e.g.
"video/mp4") to identify the format of the initData parameter and attribute.

*If* we used an identifier that is *not* a MIME type, we could specifically
identify the protection scheme in ISO BMFF (i.e. "cenc") and avoid the
ambiguity or generic solution that has been discussed in this bug.

If we did this, we may need some way to detect what format(s) are supported
since isTypeSupported() currently takes a MIME type. However, we already have
this issues with ISO BMFF - applications can query whether "video/mp4" is
supported, but that does not indicate whether "cenc" or some other protection
scheme is supported.

Even if we move forward with the generic solution of including the "sinf" box,
I don't think applications will be able to detect whether a user agent supports
a specific protection scheme.

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Received on Saturday, 18 January 2014 07:28:43 UTC