2 Aug
2014
2 Aug
'14
12:06 a.m.
Am 01.08.2014 um 22:08 schrieb Ben Edwards:
Will prores 4444 work? Seems best way to go.
Some high end codecs may occasionally cause problems with FFMPEG/DCP-o-matic, better check
compatibility with a short snippet before you create the full length file. DCP-o-matic
will usually tell you right away if it has a problem with the specific codec.
Also in terms of creating a DCP with requires a KDM key what setting shall I use. I ask
because I played around with this a wile ago and it did not work. No error, it just did
not create the file.
You can only create KDMs if you have a certificate from a specific digital projection
system that is meant to play the DCP. So, first step is to make sure you will get this
specific certificate from the cinema, projectionist, manager, whatever. They will already
need to know on which specific screen/projector your DCP will finally play (or they need
to send you the certificates of ALL their systems and you need to create KDMs for all of
them).
Some cinemas will not be able to supply a certificate, but only a server/media block
serial number. For some equipment, this serial number will allow you to download the
certificate linked to that serial number from an internet database within DCP-o-matic.
If you don't get a certificate, it makes no sense to encrypt the content (which is a
prerequisite to creating a KDM), because the DCP will not play. You can also NOT test your
encrypted DCP, unless you have access to that specific projection system, or a software
DCP player with support for encrypted DCPs (which will allow to create it's own
certificate to be used by DCP-o-matic) so, make sure you also create an unencrypted
version first, test it, then create the encrypted version without altering ANY other
options. Encryped content may cause lost shows - make sure you are prepared and have an
unencrypted version at hand if the encrypted version fails.
You should also use the most current version of DCP-o-matic, as encryption is a fairly
recent feature.
Also, DCP-o-matic has a choice of creating SMPTE or Interop compliant DCPs AND KDMs - both
need to fit either standard, and I suggest to go the 'old' Interop way, that is,
create an encrypted Interop DCP, then create a KDM type 'Modified Transitional 1'
(wink wink, Wolfgang ;-)
Try NOT to create a stereo audio track. Surrounds and LFE can be omitted, but a dedicated
center channel really is advisable. Take care about audio levels, Cinema audio usually
uses a large headroom to accommodate for very loud action sound. 'Traditional'
audio leveling with less headroom will usually turn out too loud in cinemas.
- Carsten