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This topic comprises 2 pages: 1 2
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Topic: KDM timing question
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Manny Knowles
"What are these things and WHY are they BLUE???"
Posts: 4247
From: Bloomington, IN, USA
Registered: Feb 2002
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posted 03-06-2013 12:16 PM
This came up a few weeks back in this thread.
From DCI Specification v1.2
Section 9.4.3.5, Under the sub-heading "Security Manager (SM) Functions."
quote:
2. Security Manager (SM) KDM usage policy is specified as follows:
a. Playout shall be fully supported by a single KDM, inclusive of all required essence
keys and playout time window (i.e., a playout shall not occur that requires the
combination of two or more KDMs).
b. For any given composition, playout shall be enabled for any start time that is within
the KDM's time window.
c. To avoid end of engagement issues, a show time’s playout may extend beyond the
end of the KDM's playout time window, if started within the KDM playout time
window, by a maximum of six (6) hours.
d. Excepting the requirements of item 2c above, the SM shall delete any KDM and
associated keys for which the playback time window has expired (passed).
Emphasis is mine.
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Carsten Kurz
Film God
Posts: 4340
From: Cologne, NRW, Germany
Registered: Aug 2009
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posted 10-17-2014 08:53 AM
Again - there is NO 6hr playlist limit imposed by DCI, studios, etc.
Such a limit is purely up to the server manufacturer/software programmer. They may impose one for certain reasons or not, just as they would impose limits on the max number of DCPs or KDMs in storage for specific reasons or not. Some may actually use the DCI-imposed KDM playback-expiration limit of 6hrs as a reason to internally limit all playlists to 6hrs max. But that is not what DCI intended with it, and it is not what DCI enforces.
In reality, this is not really a problem. There may be rare cases where a KDM expires unreasonably fast. Most of our KDMs expire at a time around 1 or 3 o'clock in the morning, but typically multiple days or weeks, sometimes months, after booking expired.
A KDM expiring at 1 o'clock in the morning means that the feature could be played until 7 o'clock if contained in a playlist and paused within. The last option to start the feature OR playlist containing this feature would be 0:59:59 or whatever a few seconds would give around checking for the condition. I don't see what the issue here should be. If a KDM is issued too sharp, then request another one and quote a good reason. True, festival KDMs with 3hr validity windows are stupid, but there is neither the server company nor the DCI to blame for it. If your showtimes are a moving target, you should notify the KDM issuing entity of this in advance, or make sure someone is answering the phone instantly once you need a prolongation.
- Carsten
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Frank Angel
Film God
Posts: 5305
From: Brooklyn NY USA
Registered: Dec 1999
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posted 10-17-2014 08:53 AM
How exactly does having a 6hr playlist limit protect the studio from anything -- perhaps some unscrupulous exhibitor sneaking in an unauthorized show or a pirate with an eye patch hiding in the DI bushes hell bent on doing some nefarious copyright infringement?
If the right to play a title is given via a KDM for a certain time frame, why is there an additional limit imposed by the "player?" Seems the KDM should be valid no matter how the title is programmed at the site.
Really, the 6hr limit is a totally foolish and useless restriction borne out of the well established studio "piracy paranoia," ESPECIALLY as there are now exhibitors such as DIs who routinely run programs like triple features that play longer than 6hrs. But then again, never was distribution terribly concerned about the burden caused by their unilateral imposition of digital on exhibition. quote: Joris Springer
...it causes is extra costs and extra money even though the logs already tell the distributor when a movie is played.
No doubt, Joris.
As for the show to terminate after 12m just because it's a new day, that makes no sense at all -- the KDMs are day AND time specific, yes? They are authored to whatever time the distributor has the film booked, If it is known that an exhibitor is running triple features that run over the 12m mark, why can't the distributor just send a KDM that accommodates that need? Or it is just business as usual, i.e., the day ends at 12m and to hell with that it will screw the exhibitor? It's not brain surgery for the studio to just author the KDM to end at 2am rather than midnight. What's the big deal or is it just orneriness? Or worse, do they sit in their offices thinking what a laugh it is that they can cause a guy's show to stop right in the middle of the climax? Or worse than that, do they not even care?
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