I just did a test with separate video/audio clips. Imported them, video source is 24fps. DCP-o-matic reports source and DCP will have same frame rate. No mention of audio. I then adjust the DCP frame rate to 25 fps. DCP-o-matic tells me that the frame rate will be adjusted to 25 fps. However, there is no indication what it will now do anything with the audio? I think we discussed this before shortly, but didn't come to a proper conclusion. With separate audio files, will DCP-o-matic simply assume that the separate audio has to be in sync to the chosen DCP frame rate? Because with a different frame rate for video, it could just as well resample the audio to 25 fps as well - but it needs to be instructed to do so - which includes that there is a frame rate/sampling rate relation established before and a change being notified.
The question is - with separate audio, how/where do you establish it's frame rate reference at first so that DCP-o-matic knows to what framerate the audio is referenced? With interleaved audio, this is clear, upon loading it, the audio/video timing reference is established, but with separate video and audio files?
Did I make my issue clear?
- Carsten
Hi all,
I am keen to release DCP-o-matic 1.77.0. Does anyone have any outstanding
problems with the test versions 1.76.x (especially 1.76.34) ?
Thanks!
Carl
Someone just gave me a Dell poweredge R415 with dual sockets and 2 AMD CPUs
eatch with 6 core (think they are aroung 3ghz). Eatch CPU has its own
memory slots.
So what would be the snesable minimum and good amount (without going over
the top) of memory for each CPU?
Ben
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Hi all,
I have a user who is reporting that he has a content file graded to Rec.
709, which he is converting to DCP using DCP-o-matic's Rec. 709 preset.
He reports that on a projector he sees pinker skin tones, and the entire
image seems a little desaturated.
He also tests on Easy DCP player and gets the following results with its
various colour conversions:
XYZ to RGB (P3): exactly as seen in the cinema (pinker skin tones,
desaturated)
XYZ to RGB (Rec 709): looks as it should
I'm a bit confused... does anyone have any idea what might be going on?
Thanks!
Carl
Hello all.
I'm doing tech on the London Short Film Festival which is January. We
are delivering all the films to cinemas on DCP this year (all 350 of
them) and will be using DCP-o-matic to use them.
We're holding a workshop tomorrow and Sunday where we're going to train
100 film-makers on DCP-o-matic, and then guide them through the process
so that by the end of the weekend, they will hopefully all have DCPs of
their films.
I have a couple of last-minute questions that I would very much
appreciate it if anyone would be able to help with.
_1. Encoding servers_
We have a network of 30 iMacs, all networked together with Gigabit
ethernet. We intend to run dcpomatic_server_cli on all of those, with
DCP-o-matic itself running on the laptops of the film-makers and using
the encoding servers to do the heavy lifting.
a. Will it work with 30 encoding servers?
b. What happens if two instances of DCP-o-matic try to send jobs to the
encoding servers simultaneously? Is it first-come-first-served and
whoever submits their job first gets control of all the encoding servers
until their job is complete? Or do the encoding servers get shared out
between different jobs so multiple jobs can run concurrently? Or,
terror-of-terrors, will the whole thing crash?
_2. Best version to use_
How stable is v1.76.13 likely to be? Or should we use v1.76.0?
I've been told that some issues with colour space conversion are being
resolved in recent test releases. Is v1.76.13 going to give a better
result in terms of colour than the 1.76stable?
Sorry for the barrage of last-minute queries. I hope someone may have
some pointers?
Many thanks,
Jim
---------- Forwarded message ----------
Date: Wed, 15 Oct 2014 14:47:14 +0100
From: A. R. Madabushi <armadabushi(a)gmail.com>
To: Carl Hetherington <cth(a)carlh.net>
Subject: Re: [DCP-o-matic] P3 to XYZ conversion matrix (fwd)
Hi Carl thanks for the info!
The film is currently a DPX sequence in Resolve that was rendered in P3 colour space already. My DCP program doesn’t allow me to passthrough the file as
is, without performing an XYZ transform…which means I just need to make sure the DCP output looks the same as the DPX sequence.
If I export TIFFs from Resolve with an XYZ LUT applied, the DCP program will end up doing it again - so that’s XYZ conversion done TWICE, which I want to
avoid.
I found this site:
http://www.brucelindbloom.com/index.html?Eqn_RGB_XYZ_Matrix.html
…and given the info Carsten sent through I could make it…IF I understood how to do this kind of maths!
If I can figure out the maths - I could make it work! So CLOSE!!!
On 15 Oct 2014, at 14:38, Carl Hetherington <cth(a)carlh.net> wrote:
---------- Forwarded message ----------
Date: Wed, 15 Oct 2014 15:03:08 +0200
From: Carsten Kurz <audiovisual(a)t-online.de>
To: DCP-o-matic carlh net <DCPomatic(a)carlh.net>
Subject: Re: [DCP-o-matic] P3 to XYZ conversion matrix
Maybe this helps in creating a matrix:
DCI-P3
Gamma 2.6
White point
x 0.314
y 0.351
Red
x 0.680
y 0.320
Green
x 0.265
y 0.690
Blue
x 0.150
y 0.060
From what I understand now, xyz is the storage format within the DCP, while P3 is the color space used by DCI projector itself. When a server
plays a DCP,
it transmits xyz to the projector. The projector will convert to and show P3.
In a grading situation with a projector connected directly to the grading workstation for realtime playout, the xyz conversion is omited and P3
is played
directly from the grading workstation into the projector. A DCI projector therefore needs at least two different input profiles - P3 1:1, or
xyz->P3.
Now if you say you have a file sitting in P3 color space - what does that mean? Is it the color space associated with the editing project, or
do you have a
file rendered out in P3 - if so, which container/codec?
- Carsten
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I guess the intention of the 'Show DCP' menu entry under 'Jobs' ist to show the path/directory of the currently generated DCP? I think this never worked in the Mac version, or did it? Currently, it does nothing.
A lot of unexperienced users ask which of the various files and directories DCP-o-matic creates should be copied to the transfer drive. While this is essentially a training/knowledge problem, I think choosing 'Show DCP' should result in the display of the parent folder of the DCP directory, with the DCP folder selected/highlighted so it can be easily identified. It nearly works in the windows version ;-)
- Carsten
