[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 #6 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
(In reply to y.bandou from comment #5)
> (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.

How would a decryptor distinguish between them then, how would a decryptor know
which DRM system is used or how could we make sure the correct decryptor that
supports the required DRM system is used in the pipeline?

That seems like something missing in the Matroska spec

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