[Bug 784129] event: make DRM system id optional in GST_PROTECTION event

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=784129

--- Comment #5 from y.bandou <bandou.yacine at gmail.com> ---
(In reply to Sebastian Dröge (slomo) from comment #4)
> Why do you want to not put the DRM system ID into the event though? You know
> it, so you can as well put it into the event :)
> 

As i answered to Olivier.

In Webm/Matroska encryption metadata don't have the DRM System ID.

In my case, we always choose Widevine, but I can't set it as system DRM in 

matroskademux, because it can be an other DRM system encryption, like ClearKey.


> This might be related to https://bugzilla.gnome.org/show_bug.cgi?id=770107 ?

Yes is related, If i understood, they suggest to set many system DRM ID in the
protection Event.

I think, in long term, we should support all these cases: without  or with one
or many system DRM.

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