Re: [Bug 20944] New: EME should do more to encourage/ensure CDM-level interop

On Tue, Feb 19, 2013 at 5:44 AM, Mark Watson <watsonm@netflix.com> wrote:

>  On Feb 17, 2013, at 3:36 PM, Robert O'Callahan wrote:
>
> By "interop at the CDM level" I mean the degree to which CDM support is
> uniform across user-agents, by which I mean both that each CDM should be
> supported in as many user-agents as possible, and each CDM should work in
> exactly the same way across user-agents. (There is probably also something
> to say about the content production side, but I know less about that.)
>
>
> Common Encryption helps here. We don't expect all UAs to support a common
> CDM and that's ok, so long as the CDMs they do have support common
> encryption. There is some overhead on the server side to support multiple
> CDMs, but that is better than restricting content to a subset of devices or
> trying to force devices to support a particular CDM. The key point is that
> with common encryption we can use the same media file with different CDMs.
>

It does help but it doesn't make the problem go away, given support for
each CDM has to be included at the server and in Web app client code. I
recognize we won't be able to equalize CDM support across UAs, but the
closer we get to that ideal the better.

Rob
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