How to add an alternative audio to encrypted DCP?

Anything and everything to do with DCP-o-matic.
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dipo
Posts: 2
Joined: Sun Jan 06, 2019 5:01 pm

How to add an alternative audio to encrypted DCP?

Post by dipo »

Hi everyone!
Does anybody now how to add an alternative audio to the encrypted DCP if I haven't a DKDM?
For example there is a working method for subtitles: http://uross-digital-tools.appspot.com/ ... tToDCPSubs
May be there is some method for audio?
Carsten
Posts: 1716
Joined: Tue Apr 15, 2014 9:11 pm
Location: Germany

Re: How to add an alternative audio to encrypted DCP?

Post by Carsten »

You can not add subtitles to an encrypted DCP if you do not get a DKDM for it. The method you linked to (adding a VF) can be applied with DCP-o-matic as well - but only for unencrypted content, or if you receive a DKDM for encrypted content. What they describe for encrypted content is a hack that depends on some system's specific ways to deal with intermediate KDM formulations. That approach may work on some systems and fail on others, or may be broken with future software updates.

A range of ideas circulate about how to add subtitles or additional audio tracks to encrypted DCPs that can not be manipulated by classical means. Most of them deal with a way to sync external media to a playing DCP in a way that does not interfere with the DCP/hardware at all. Some DCI player systems output a time code to which you could sync an external audio or subtitle player. More advanced recent systems use the DCP audio as a fingerprint/timecode track. However, I haven't see an actual product, or free/open source solution. Some festivals simply use a free running presentation software and hope for the best. Some trigger subtitles manually.

- Carsten
gunnar
Posts: 52
Joined: Tue Apr 15, 2014 1:06 am

Re: How to add an alternative audio to encrypted DCP?

Post by gunnar »

Without DKDM you can't do anything at all.
dipo
Posts: 2
Joined: Sun Jan 06, 2019 5:01 pm

Re: How to add an alternative audio to encrypted DCP?

Post by dipo »

Thank you for the answer, Carsten!
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