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  • Hey all, just changed over the backend after 15 years I figured time to give it a bit of an update, its probably gonna be a bit weird for most of you and i am sure there is a few bugs to work out but it should kinda work the same as before... hopefully :)

Digital Cinema Package

Somewhat yes: Whoever wants to deliver content keys to a digital cinema server will need that server's certificate (which contains the public part of the server's key pair) and the signing chain of certificates down to its root authority from a trusted location. The higher the content's value the more trust you want to have in that location.

Wrt the DC20: Wasn't aware of the vendor, interesting. Contacted them (techsupport@datasatdigital.com) and asked where to get their certs. Update: techsupport writes "The DC20 certificates can be found on ftp://certificates.qubecinema.com. They are located in the SMPTE directory."

Doremi keeps server certificates at ftp://doremilabs.com/dcp2000/Certificates/ (user: service, pass: t3chn1c1an)

Wrt Dolby: Terrence had contacted Dolby about access to server certs. They'll answer inquiries sent to dolbycerts@dolby.com. Update: Dolby writes they need site and screen info, serial and the CAT862 serial (should be a 6 digit number starting with 51).

Say, will you need KDMs from my side or are you going to run cinemaslides yourself? Content keys for the test DCP are up at https://github.com/wolfgangw/digital_cinema_tools/tree/b0548b7387e536dbe08f4c6808aa212fa64a6cc9/kdm/content_keys/cpl_5b7f206c-29e1-495b-bd00-8760d746f6a3. Anyway, see https://github.com/wolfgangw/digital_cinema_tools/tree/master/kdm/vincentb for your Doremi's and DC20's certificates and KDMs for the test DCP CRYPT-BLUE_TST_F_2K_20101208_WOE_OV (https://github.com/wolfgangw/digital_cinema_tools/raw/master/CRYPT-BLUE_TST_F_2K_20101208_WOE_OV.zip).
 
Thank you Wolfgang and Terrence for your excellent work!

I stumbled on this when working with a local film festival. Dolby has an ftp-server with server certs:

ftp.dolby.co.uk

user:dolbyrootcertificates
pw:houro61l
 
Wolfgang Woehl said:
Wrt Dolby: Terrence had contacted Dolby about access to server certs. They'll answer inquiries sent to dolbycerts@dolby.com. Update: Dolby writes they need site and screen info, serial and the CAT862 serial (should be a 6 digit number starting with 51).
Click to expand...

In the case of the DSS100/DSP100 you provide the serial of the DSP100 (media block) and in the case of the DSS200, you supply serial number of the CAT862 (media block inside the DSS200).
 
Dolby writes this serial number shows up as DSS200 601704 (CAT862 511733) which would point to the Power Plant Mall Makati on the Philippines. Would that be right?
Click to expand...
yeah that server is installed at Powerplant Mall here in the Philippines. Been busy for Digital Cinema installation the past few days and i have yet to test the KDMs you generated for me.

Regarding with the error i encountered with the tiff conversion using ffmpeg, is there a command in which way i can specify the bit depth? Or should i use another program to do that?
 
Vincent Baloran said:
yeah that server is installed at Powerplant Mall here in the Philippines. Been busy for Digital Cinema installation the past few days and i have yet to test the KDMs you generated for me.

Regarding with the error i encountered with the tiff conversion using ffmpeg, is there a command in which way i can specify the bit depth? Or should i use another program to do that?
Click to expand...

What is your source bit depth? Can you open the tiff in another program like gimp or photoshop and verify the bit depth? The command looks ok.
 
I cannot open the tiff in photoshop. I don't have gimp installed on my pc:(
I can encode them to jpeg2000 (using opendcp or the command line in DCPC) after applying this command:
-type TrueColor -alpha Off -depth 12 -gamma 2.6 FRAME.tif
 
Vincent Baloran said:
I cannot open the tiff in photoshop. I don't have gimp installed on my pc:(
I can encode them to jpeg2000 (using opendcp or the command line in DCPC) after applying this command:
-type TrueColor -alpha Off -depth 12 -gamma 2.6 FRAME.tif
Click to expand...

Could you send me a non-working tiff? terrence72@gmail.com. I'm guessing the alpha channel is not being handled properly.
 
Vincent Baloran said:
... the non-working tiff i extracted from an mp4 file using ffmpeg ...[/URL]
Click to expand...

Code: 
$ opendcp_j2k -i 000001.tiff -o 000001.j2c
[ERROR] TIFF file creation. Bad color format ...
$ identify -verbose 000001.tiff | grep Compression
   Compression: RLE
$ convert 000001.tiff -compress none uncompressed.tiff
$ opendcp_j2k -i uncompressed.tiff -o uncompressed.j2c # yeah, well, you know what I mean :)
   <works>
$ identify -verbose 000001.tiff uncompressed.tiff | grep signature
   signature: b3ad2eabc40a9ddd70ecec1d9494fcd0bc58017588ef87a1fb9c897a8c63284c
   signature: b3ad2eabc40a9ddd70ecec1d9494fcd0bc58017588ef87a1fb9c897a8c63284c

Odd, libtiff knows RLE.
 
Wolfgang Woehl said:
Code: 
$
Odd, libtiff knows RLE.[/QUOTE]

It handles the compression. The issue is that the image is encoded YCBCR format which OpenDCP doesn't currently support. It is on the top of the todo list, because most HD content is encoded this way.

You can confirm by doing

# convert 000001.tiff test.tiff
# identify -verbose 000001.tiff > 000001.txt
# identify -verbose test.tiff > test.txt
# diff 000001.txt test.txt
#
65,66c64,65
<     tiff:photometric: RGB
<     tiff:rows-per-strip: 1
---
>     tiff:photometric: YCBCR
>     tiff:rows-per-strip: 2
Click to expand...
 
I should add that you can do the conversion in ffmpeg while you are creating the tiff files with the -pix_fmt rgb24 parameter...

ffmpeg -y -i sample.mp4 -an -r 24 -pix_fmt rgb24 -vcodec tiff tif/%06d.tif
 
Terrence Meiczinger said:
I should add that you can do the conversion in ffmpeg while you are creating the tiff files with the -pix_fmt rgb24 parameter...

ffmpeg -y -i sample.mp4 -an -r 24 -pix_fmt rgb24 -vcodec tiff tif/%06d.tif
Click to expand...

Ffmpeg should by default be able to read the framerate from the file's header/metadata, right?
The few files that I've tested, it read fine... but that was 25fps material that I wanted to make into a 25fps dcp.
I haven't tried creating a 24fps DCP from 25fps material (or vice versa), but I guess that's when this option is useful.

I am just thinking that maybe ffmpeg can't correctly read the fps of all files, so maybe leaving it on even though you're not converting between framerates is a good idea?

Just a curious thought... I'll give a shout if I encounter a file that can't be read correctly by ffmpeg.
 
Last edited:
Having gone through this entire thread (which has been incredibly helpful, thankyou!), the only piece of information I cannot see is regarding MPEG MXF Interop packages.

Using FFMPEG as someone mentioned, I was able to encode video using this command line:

ffmpeg -i source.avs -flags +ildct+ilme -s 1920x1080 -an -sameq output.m2v

But I was wondering if it is possible to limit the bitrate using the "-maxrate" switch, in the same way as the 'quality' setting with Jpeg2000 tool?

Is this 'allowed'?
 
Matt_G said:
But I was wondering if it is possible to limit the bitrate using the "-maxrate" switch, in the same way as the 'quality' setting with Jpeg2000 tool?

Is this 'allowed'?
Click to expand...

in ffmpeg you can use the -b option. Use -b 200k for 200 kilobit per second
 
D-I-Y DCP Creation using OpenDCP.

D-I-Y DCP Creation using OpenDCP.

My goal was to make OpenDCP work on a Sony SRX R-320 and after numerous attempts -- as an independent filmmaker, I am elated to say it worked perfectly! It wouldn't have been possible if Terrence Meiczinger hadn't developed OpenDCP.

Admittedly, a few weeks ago I didn't know much, if anything, about creating DCP files… let alone a stereoscopic 3D-DCP. I had recently finished work on a self produced and directed short film, "Dead of Nowhere", that I was able to make largely in part utilizing the crowd-based funding site Indiegogo. I used a Final Cut Pro / 2K Cineform workflow to edit and finish my film. I shot my film guerilla style in one day, handheld on location with the Element Technica Dark-Country beamsplitter rig, recording to a 1-Beyond Wrangler. When I learned that it was going to cost somewhere between $1,500 and $3,000 to have my ten minute film encoded in order to have it shown in a realD™ equipped theater, I knew I had to find an alternate "indie" solution to create my DCP.

After investigating all of the commercial solutions (easyDCP, Doremi, etc.) and speaking with several "indie-friendly" post houses -- all of whom bid out of my price range… I stumbled onto OpenDCP.

While the notion of using an open-source command-line tool, still in development, isn't for the faint of heart, and I am by no means a Unix Pro, the process was pretty simple once I understood how the OpenDCP tools worked.

There have been plenty of how-to posts, so I won't get into a lot of detail here… but basically after getting my film into a Left Eye / Right Eye TIFF sequence at the correct aspect ratio (1998 x 1080), the frame rate at (24p), ensuring that my audio was the exact same length (intrinsic value) and the correct sample rate (24bit), it was a fairly straight forward process to convert to XYZ jpeg2000 (.j2c) using opendcp_j2k and then using opendcp_mxf to wrap the stereoscopic-picture and main-audio elements into separate mxf files. After figuring out that I needed to be sure to have the digest (-d) and annotation (-a) tags set in opendcp_xml, it was then just a simple matter of getting these files onto a drive to load into a cinema server.

Now, don't get me wrong, this will probably not work the first time. I had to make several trips back and forth to the theater, trying various DCP versions (interop and smpte) and hard drive formats (I settled on NTFS).

If you're an indie-filmmaker, trying to get your film digitally packaged for exhibition and don't have the money to spend, or are the kind of person (like me) that enjoys learning about every step of the process -- I couldn't recommend a better, more rewarding way of creating a DCP.

---------------------

More information about OpenDCP and DEAD OF NOWHERE can be found here:

OpenDCP Link: http://code.google.com/p/opendcp/

Short Film: http://www.deadofnowhere.com

Facebook: http://www.facebook.com/deadofnowhere
 
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